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John Deere (JS63) self propelled mower has very high RPM. How can I fix this?

Customer Question
I have a John Deere...
I have a John Deere (JS63) 6.5 HP 3-in-1 self propelled mover which I purchased in May 2001. Product # XXXXX Engine serial #(NNN) NNN-NNNN It starts and runs, and have been using it, but engine races. Very high RPM's. I am afraid it is going to blow a rod or something. I tried making adjustment with carb, but engine still races. I hate to get rid of it because it has been a very dependable mower. Just don't know if it is worth fixing. Any ideas to what the problem could be, carb, govenor?
Submitted: 6 years ago.Category: Small Engine
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Answered in 12 minutes by:
10/2/2011
Technician: James W, Small Engine Troubleshooting Expert replied 6 years ago
James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3,708
Experience: 7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
Verified

James W :

Greetings, My name isXXXXX and I am here to help the best I can. My goal is 100% satisfaction. Let's get started.

James W :

Very likey it is a very simple problem or one rendering the engine not worth fixing

James W :

OK, just kidding

James W :

likley you have lost a governor spring or it has just popped off and is just hanging there

James W :

The engine numbers you gave are not particular helpful

James W :

would need model number and then the type number and then the serial number

James W :

If it is a Briggs engine the model would be much like

James W :


(NNN) NNN-NNNN


James W :

12H802-0269 etc

James W :

and the serial number woudl be 01646546546 or something like that

James W :

But anyway, the only reasohn I would need the numebers if I need to help you get parts

James W :

Or if a diagram is needed to help hook the governor spring or linkage up right

James W :

If the spring is missing, you have to go buy one anyway

James W :

so, If one of My customers were smart, they would play dumb

James W :

and bring the entire mower in and say..

James W :

Can you help me to get the right governor spring for this engine

James W :

then once I had the spring in my hand, they would say "how much to install it".

James W :

If I am standing in front of a mower with the cright governor spring in my hand, if offerend $10 bucks to throw it one and make sure it is hooked up right, I am hooking it up...

James W :

Takes 45 mins if you do not know what you are doing

James W :

and 3 minutes if you do.

James W :

IF it is not a governor spring issue, then likely you have broken the governor gear inside the engine and it will need replaced

James W :

the gear is cheap, the repair is a pain in the rear and takes 1 hour to 1 1/2 hours start to finish

James W :

It is in side the crankcase and requires removal of the base plate.. You would need to make sure the gear on the cam shaft is OK..

James W :

AND, if it were me, I woudl replace the rings while I was at it to account for any wear over the past 10 years and regain engine power

James W :

Having saidf that.. It is likely a spring or linkage problem.

James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3,708
Experience: 7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
Verified
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Customer reply replied 6 years ago
There is a decal on the cover that say's family group YBSXS.1901VE 274474. Also there is a cover over muffler with(NNN) NNN-NNNNE1010102FA if that will help.
Technician: James W, Small Engine Troubleshooting Expert replied 6 years ago

You have found the numbers, I think

http://www.partstree.com/parts/?mn=124602&lc=briggs_and_stratton&page=1

 

But you may wish to check them again. The above shows all known model type number combos... (2 short pages).

 

But even then, you could click on any one and be likely to bring up a carb, linkage, and control diagram set that may help or at least let you take inventory of something missing..

 

I just do not show a 0269-E1 as an option for the 124602

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Technician: James W, Small Engine Troubleshooting Expert replied 6 years ago

I found this which may also help..

 

It is a complete service manual for this engine.

 

http://dc347.4shared.com/download/YMM7Inin/272147_Vanguard_Single_Cylinde.pdf?tsid=20111002-151947-84e8e909

 

And other engines in the same series..(Not exactly the same).

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James W
James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3,708
3,708 Satisfied Customers
Experience: 7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

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