Iron popper, Lavoy will be able to tell you for sure but I'd say it could be either carb adjustment or valve adjustment.
On some of the quads I've worked on that was one of the first signs that the valves were getting out of adjustment was backfiring on decel.
I would think that's it's more in the carb adjustment area first. Your high end is probably set a little rich.
Bull2
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- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
- 440 iron popper
- 1010 crawler
- Posts: 273
- Joined: Sun Sep 26, 2010 7:48 pm
- Location: Québec, Canada
Thanks for the advices Ben. Carb will definitely be cleaned and rebuilt next spring. I noticed it wasn't very clean inside... I'll go through valve adjustment again. It might be off a bit.
Did you work a bit lately with yours?
Did you work a bit lately with yours?
440IC 1958 #443712, 602 blade, Gearmatic winch project in the back
440IC, serial tag gone, Blade with tilt
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440IC, serial tag gone, Blade with tilt
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I would lean towards carb, but could be timing or advance issue.
Lavoy
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com
Owner and moderator www.jdcrawlers.com
- 440 iron popper
- 1010 crawler
- Posts: 273
- Joined: Sun Sep 26, 2010 7:48 pm
- Location: Québec, Canada
I'll do a check of all this then. Thanks.
I got the motor head back from the shop:
It looks good. I'll put that "new" head on as soon as I have some spare time to spend on the crawler. Pretty busy lately...
Sorry for picture quatily. I tought i was shaking but i discovered that all pictures taken with the ipad since they went with ios7 were not good as they use to be... It has been a downgrade since i installed it. Anyway it is better than a drawing!
I got the motor head back from the shop:
It looks good. I'll put that "new" head on as soon as I have some spare time to spend on the crawler. Pretty busy lately...
Sorry for picture quatily. I tought i was shaking but i discovered that all pictures taken with the ipad since they went with ios7 were not good as they use to be... It has been a downgrade since i installed it. Anyway it is better than a drawing!
440IC 1958 #443712, 602 blade, Gearmatic winch project in the back
440IC, serial tag gone, Blade with tilt
-------------------------------------------------------
440IC, serial tag gone, Blade with tilt
-------------------------------------------------------
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