How JustAnswer Works:

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

Ask CJBennett Your Own Question

CJBennett
CJBennett, Small Engine Technician
Category: Small Engine
Satisfied Customers: 624
Experience:  Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.
17032296
Type Your Small Engine Question Here...
CJBennett is online now
A new question is answered every 9 seconds

lawnmower turns over until it gets to compression stroke.

Customer Question

lawnmower turns over until it gets to compression stroke. bypassed all safety switches, put current directly to starter motor, same results. Used jumper cables from car directly to starter motor, same results. Remove plug, motor turns fine. Had same trouble a few years ago, guy said the wiring harness was damaged when i bypassed harness. i thought then that the starter motor was bad, bought a new one but had same trouble. i can't find anything wrong with current wiring. fuse is good. scotts 1742, intek 17hp, purchased 1998, can get serial # XXXXX needed
Submitted: 5 years ago.
Category: Small Engine
Expert:  CJBennett replied 5 years ago.
Hello. The first thing I would do is adjust your valves. With the engine at top dead center they should be set at .004 . If adjusting the valves doesn't take care of the problem you could have a bad decompression on your camshaft. The decompression lets the exhaust valve hang open a little till the engine starts. If it is bad you will have to replace the camshaft.
Customer: replied 5 years ago.
can i adjust valves from the outside? i'd rather not take the head off. i took the valve cover off and observed the valve movement without the plug in place. valve movement and timing (as best as i can tell) are ok
Expert:  CJBennett replied 5 years ago.
Sure you can. Pull the plug and turn the engine over till the intake valve closes and the piston is at the top of its stroke. That's top dead center. Then check the clearance inbetween the rocker arm and the valve stem. You will need a .004 feeler guage. You can adjust them by turning in the nut that holds the rocker arm on the stud. Make sure it's a tight .004.
Customer: replied 5 years ago.
the valve clearance was little excessive, i tightened it up and set it as best i could with a .005 (smallest i have). put the plug back in, still stops on compression stroke.
Expert:  CJBennett replied 5 years ago.
You've got a bad camshaft then. The engine is going to have to come off and a new cam installed. I do them all the time on the Inteks (plastic camshaft).
Customer: replied 5 years ago.
please enlighten me. if the valve actuation is good, how can the camshaft be bad?
Expert:  CJBennett replied 5 years ago.
The decompression lever on your camshaft has a broken spring. The spring engages the lever and lets the exhaust valve hang open a little while starting it (relieving compression). Once the engine starts the centrifical force diengages the decompression.
Customer: replied 5 years ago.
do you know the b&s part #'s i need? if i replaced the whole assembly (camshaft, springs, bearings, etc...)?
Expert:  CJBennett replied 5 years ago.
Sure, whats you engine number?
Customer: replied 5 years ago.
b&s model 311777
type 0143-E1
code 981104ZE
Expert:  CJBennett replied 5 years ago.
The camshaft kit part number is XXXXX The gasket is 692226, and the lower seal is 291675S. It's not to bad of a job. Just make sure you line up the timing marks on the gears. Reset your valve clearance when your done.
Customer: replied 5 years ago.
does the camshaft kit include the spring and/or lever you mentioned?
Expert:  CJBennett replied 5 years ago.
Has everything you need to do the job.
Customer: replied 5 years ago.
Looking at the parts manual, I can't find the decompression lever or spring. Not trying to be a smartass, i just want to be on the same page
Expert:  CJBennett replied 5 years ago.
It is built right into the camshaft. You will not be able to see it on a diagram.
CJBennett, Small Engine Technician
Category: Small Engine
Satisfied Customers: 624
Experience: Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.
CJBennett and other Small Engine Specialists are ready to help you
Customer: replied 5 years ago.
thanks
Expert:  CJBennett replied 5 years ago.
No problem. Your welcome.

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:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • 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
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • http://ww2.justanswer.com/uploads/SM/SmEngPro/2012-8-5_3564_Rick1206290005Edit.fullres.logo.scrn.64x64.jpg Rick's Avatar

    Rick

    Factory Authorized Trainer

    Satisfied Customers:

    4126
    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • http://ww2.justanswer.com/uploads/GI/giftindex/2011-11-19_2715_JamesLWells500.64x64.jpg James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    2978
    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    2950
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/MR/mr2cycle/2011-3-12_03458_sears.64x64.jpg Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    2374
    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • http://ww2.justanswer.com/uploads/rheisnger/2010-12-31_010856_41385_100001225699183_7012_q.jpg RUSS's Avatar

    RUSS

    SERVICE TECHNICIAN

    Satisfied Customers:

    1723
    28 YEAR SERVICE TECHNICIAN
  • http://ww2.justanswer.com/uploads/BriggsEngines/2010-02-26_230200_n1834842973_4823.jpg CJBennett's Avatar

    CJBennett

    Small Engine Technician

    Satisfied Customers:

    623
    Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.
 
 
 
Chat Now With A Technician
CJBennett
CJBennett
Owner of Power Equipment Shop
623 Satisfied Customers
Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.