Motorcycle

Motorcycle questions? Ask a mechanic.

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

I have a 1992 FXR that I have just fitted a Revolution 85…

Hi, I have a 1992 FXR...
Hi,
I have a 1992 FXR that I have just fitted a Revolution 85 cube bolt on kit to as well as an ev27 Andrews cam and new performance lifters with a new steel cam chest breather.
All clearances are correct....Timing is correct for cam ,breather and ignition, problem is Bike wants to push out a significant amount of oil from the breather which is lower crankcase type and the filter sits just above the primary, makes a mess and dangerous for oil on rear wheel.
I have checked Cam,Breather Timing 3 Times and all is fine.
Bike never had this problem prior to rebuild.
10.5.1 comp ratio.
Any Ideas?
Cheers
Errol
Show More
Show Less
Ask Your Own Motorcycle Question
Answered in 13 minutes by:
1/21/2018
Steve
Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 7,177
Experience: 30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
Verified

the most common cause of those symptoms is an over filled oil tank or replacing the gear case cover to a late EVO (head breather) style.

- my recommendation is to throw the breather hose filter in the trash. it's not necessary and performs no function.......off idle, the breather pushes air out. there is nothing to filter.

- verify the HOT oil tank level. with the engine running and the oil cap out, you should be able to hear the engine breath and see an air void above the oil level when looking into the filler neck.

- this, of course, assumes the valve and breather timing is actually correct, as stated.

- re-route the breather hose under the transmission, along the frame. you may have to twist the fitting at the crankcase to allow re-routing the hose. if you do....turn it CCW 1/2 turn.

let me k ow if you need more help.

Steve

Ask Your Own Motorcycle Question
Customer reply replied 4 months ago
Can you please send me your phone call service again.

I don't do phone calls.

everything I have to say is in the answer above.

Steve

Ask Your Own Motorcycle Question
Customer reply replied 4 months ago
Ok,
Problem is, Oil level is well below filler neck (50 mm), breather is in same position it has always been and never had a problem,
Oil is returning to tank as it should while looking into tank.
Is it possible that the aftermarket breather is faulty as it is the mesh type when the stock one has much larger holes in it and never had a prob before?
I did notice when I removed the Oil Filter that it was only half full and no oil ran out of the filter housing but oil pressure is fine.
The gear case cover is original (the bike is early 92 so does not have the umbrella valves in the heads for head breath.)
HOT oil level is still 40 mm below neck.
it has an aftermarket oil cooler fitted but never had a problem with it before rebuild.
Bike was ridden hard on many rides before rebuild and never spat oil like it is now.
I am at a loss.......
The only changes are, the big bore kit, Cam,lifters and Breather. It will spit about 60-70 ml of oil in 50kms.....HEAPS.....
Comp ratio has been raised from stock to 10.5.1 possible cause?
Ring seal is excellent according to comp and cylinder leak down tests......
I have tried to send pic of timing marks......hope it works.......
As I stated before.......With the borescope inserted in the cylinders there is no sign of any bore scuffing or glazing of any kind and engine has done 300 kms...So you can appreciate my frustration with this as I have stripped and checked on 3 occasions because of all the oil running from the breather hose all over the primary and onto the road in front of the rear wheel, so redirecting the breather hose under the frame is a major concern to me because IF it does not solve the problem there will be a direct oil feed to the rear wheel where at the moment the primary is catching a bit and allows me to stop and mop it up with a rag..
Any other Ideas would be appreciated.
Errol

-the holes in the breather mesh are not your issue. the mesh only prevents metallic debris from entering the gear case and and oil pump. it's the tiny little hole in the inboard end of the breather that draws oil out of the cavity so that it does not go out the hose. I don't care if you leave a filter on it, or re-route it or not. it's not dumping oil all over my bike.

- the oil filter is on the return side of the oil system. it has nothing to do with oil pressure. but there is no way it cannot be full if it is returning oil.

- compression ratio has nothing to do with oil in the breather.

- for the breather to dump oil, it means there is too much oil in the breather cavity. this can only be caused by too much oil entering the cavity because it is overwhelming the oil pump scavenging capacity OR the oil entering the cavity is normal and the breather is not drawing up fast enough. if you failed to properly space the steel breather gear, the scavenging hole may not be lined up correctly.

- if you still have the plastic gear, put it back in and see if that doesn't solve your problem.

- if you don't, buy one from HD.

Steve

Ask Your Own Motorcycle Question
Customer reply replied 4 months ago
Thanks Steve,
I apologise if I have frustrated or insulted you but your second response has offered up the answers I have been looking for.(the oil filter is on the return side of the oil system. it has nothing to do with oil pressure. but there is no way it cannot be full if it is returning oil.)
So highlights a POSSIBLE oil return issue as the filter IS only half full so will double check this.
Your explanation of the breather is the most helpful.
"for the breather to dump oil, it means there is too much oil in the breather cavity. this can only be caused by too much oil entering the cavity because it is overwhelming the oil pump scavenging capacity OR the oil entering the cavity is normal and the breather is not drawing up fast enough. if you failed to properly space the steel breather gear, the scavenging hole may not be lined up correctly."
You have given me 2 options to look at here, pump scavenging capacity and "if you failed to properly space the steel breather gear, the scavenging hole may not be lined up correctly." SO will certainly look at this.
One more Question.
Would a cheap aftermarket oil filter cause a return problem or could it be something else?
I know it is probably a dumb question, But being a tradesman automotive spray painter I have probably sucked in to many fumes over the years : )
Errol

- the oil pump sucks oil out of the V notch under the cam and pumps it through the filter, back to the oil bag. that's why it can't be half full. there is no way for the oil to get out of the filter except to be displace and forced back, uphill, to the oil bag. it's just not possible.

- double check the end play on the breather gear. ensure you use a "used" gearcase cover gasket to get the most accurate end play.

Steve

Steve
Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 7,177
Experience: 30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
Verified
Steve and 87 other Motorcycle Specialists are ready to help you
Ask your own question now
Customer reply replied 4 months ago
Sorry, I've just double checked the filter and found the bloody seal damaged in the filter so it actually leaked out down the front of the engine but couldn't tell because of the large amount of oil from the breather.
I used a new gasket when I measured the clearance for the Breather......Shall use the one I took Off now.
Thanks for your patience Steve.
Errol
Was this answer helpful?
Ask Steve Your Own Question
Steve
Steve
Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 7,177
7,177 Satisfied Customers
Experience: 30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004

Steve is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

Jeff Policky

Jeff Policky

Motorcycle Mechanic

2,425 satisfied customers

Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP

Louie

Louie

Technician

1,281 satisfied customers

25+ yrs. experience

TIMOTO

TIMOTO

Motorcycle Mechanic

1,233 satisfied customers

Honda registered technician, silver level award, former Kawasaki/Suzuki tech, 40+ years exp.

Andre Pilon

Andre Pilon

Motorcycle Mechanic

1,032 satisfied customers

Over 25 years experience, ICS, MMI, Owned shop for 12 years, worked tech-support for Harley Davidson

Kenny O.

Kenny O.

Motorcycle, ATV, Mules, Side by Side's Product Specialist. All Brands

619 satisfied customers

Worked for Kawasaki Motors as a Product Support Specialist (Factory Support) for 24 years

asphaltcycles

asphaltcycles

Motorcycle Mechanic

458 satisfied customers

I operate a motorcycle dealership and CCS Ducati Race team.

Glenn Adams II

Glenn Adams II

Motorcycle/ATV Technician

393 satisfied customers

6 years Motorcycle/ATV/Water Craft; 4 years auto; 18 years carpenter

< Previous | Next >

Related Motorcycle Questions
My 07 yamaha r1 doesn't wanna start it doesn't crank either
my 07 yamaha r1 doesn't wanna start it doesn't crank either it just has a buzzing sound and the cluster goes off … read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
This is my first harley. Its a 2010 sportster 883Iron. It is
This is my first harley. Its a 2010 sportster 883Iron. It is fuel injected. I bought it from a kid that made his own pipes as they were ugly, i replaced them with vance and hines short/ staggered. Do … read more
Steve
Steve
Motorcycle Mechanic
7,177 satisfied customers
The speedo lights and indicator lights will go out at
The speedo lights and indicator lights will go out at different times and for different lenghts of time, and now the bike will lose power for short bursts, but only when the lights on the speedo are o… read more
Steve
Steve
Motorcycle Mechanic
7,177 satisfied customers
I have a serious problem with my Suzuki GSX 400t x 1982
Hi I have a serious problem with my Suzuki GSX 400t x 1982 (twin) It starts starts okay but.... Problems; 1. Idle rough and engine very noisy below 1400RMP – responds quickly to opening of throttle on… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have the exact same problem. I have a honda fourtrax 300
I have the exact same problem. I have a honda fourtrax 300 93model. It was running and died. It blew the fuse to the ignition. I replaced fuse it started the blew again. Now I replace the fuse and cra… read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
The thumb shift lever broke. How do I fix without a $350
The thumb shift lever broke. How do I fix without a $350 part ? … read more
Danny
Danny
Owner, lead mechanic
High School or GED
3,963 satisfied customers
My 2008 harley heritage classic keeps shutting down while on
my 2008 harley heritage classic keeps shutting down while on rides but it starts back up everytime right away … read more
Steve
Steve
Motorcycle Mechanic
7,177 satisfied customers
How do I reinstall a mirror on my can am spyder limited?
How do I reinstall a mirror on my can am spyder limited? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2006 honda trx 680 no spark. tested stator and the crank
2006 honda trx 680 no spark. tested stator and the crank position sensor. installed new ecm, 12v to the coil but no signal , we are a brp dealer so no manuels or diagnostic computer. any thoughts? … read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
Float bowl needle stuck open, crankcase filled with fuel.
Float bowl needle stuck open, crankcase filled with fuel. I'm working on a 2007 YZ450 where the float bowl stuck open and the crankcase ended up filling with fuel. The owner ran the bike not knowing t… read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
I would like to know I the black box takes a dump will you
Hello, I would like to know I the black box takes a dump will you get a code reading? And are they relatively easy to check and replace?… read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
I have abob .an many people like me find there rear guard
I have a*****bob .an many people like me find there rear guard cracks .so i was woundering if a nightrain guard will fit an also what about seat configuration. … read more
Steve
Steve
Motorcycle Mechanic
7,177 satisfied customers
What is side clearance for rings on screaming eagle forged
what is side clearance for rings on screaming eagle forged piston … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
Was changing clutch plates on my '95 Softail, now I find the
Was changing clutch plates on my '95 Softail, now I find the previous owner must have done something odd. I only have 6 steel plates and the spring plate. I pulled 8 clutch plates and didn't notice if… read more
Steve
Steve
Motorcycle Mechanic
7,177 satisfied customers
My 2015 Triglide won't throttle up and is there a recall on
My 2015 Triglide won't throttle up and is there a recall on this? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I don't know if you remember me or not, but I have the
Dear sir,I don't know if you remember me or not, but I have the Yamaha TTR-50 that will not start. I recently purchased a donor bike. The electrical works great on it, but the engine is busted on the … read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
I was started my victory cross roads yesterday but i hit the
I was started my victory cross roads yesterday but i hit the throttle while starting the bike backfired. now the bike wont start or if it does it runs for just a second and dies. ran great before yest… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Just happend today, Yes, Im working on a 06 Suzuki sv650
JA: I'll do all I can to help. How long have you been dealing with this? Customer: Just happend today JA: Do you plan on doing the work yourself? Customer: Yes JA: Anything else we should know to help… read more
Louie
Louie
Technician
Associate Degree
1,281 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x