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Author Topic:   motor stuttering
buggyman8
Dirt Full Roller

Total posts: 50
posted October 21, 2004 08:27 PM  
i have run about 4 races in to my first year racing and my engine is like its stuttering about 3/4 the way down the stretch. at first i thought it was the battery, so i changed it and it still does it, i dont understand it can anyone help...


thanks

racer17j
Dirt Forum Champ
Total posts: 5390
posted October 21, 2004 10:30 PM  
Sounds like carburation, but it could be valve float - valve springs too weak for your cam, or even a weak ignition module. I've had problems with all three in the past, and they can all cause the problem.

BIGDADDYBOZ
Dirt Freak

Total posts: 466
posted October 22, 2004 11:24 PM  
Check your fuel line routing. Mine did the same thing when my fuel line was to close to the head.

merc123
Dirt Full Roller

Total posts: 28
posted October 25, 2004 07:41 AM  
Ours is doing that but it's in the corner right before you come out.

STREET16
Dirt Maniac

Total posts: 158
posted October 25, 2004 08:38 PM  
quote:
Originally posted by merc123:
Ours is doing that but it's in the corner right before you come out.

Sounds like your running too rich a low RPM. Could be jets or power valve. Best to ask KPlugnut (kinetic perfomance).

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted October 25, 2004 09:36 PM  
quote:
Originally posted by buggyman8:
i have run about 4 races in to my first year racing and my engine is like its stuttering about 3/4 the way down the stretch. at first i thought it was the battery, so i changed it and it still does it, i dont understand it can anyone help...


thanks


Sounds to me like the jets are too small. Check all that the others have posted, if it checks ok, then you probably need to go up a step or two on your jets. Do you ever have any trouble with overheating??? Also pull out some spark plugs and examine them. Look at the color of the electrode, you want a grayish color. Check that and re-post.


te33
Dirt Freak

Total posts: 237
posted October 25, 2004 10:57 PM  
how about a fuel pump on its way out?had them do that same thing,couldn't keep up fuel flow when the secondaries kicked in.it's a cheap thing to try,and the worst thing you will end up with is a spare pump if thats not it.

pbk
Dirt Forum Racer

Total posts: 76
posted October 26, 2004 07:10 PM  
could be the module in the distrubitor, if you turning high rpm. i had the same prob,change to an aftermarket (dui)no prob since.

lazyracer5
Dirt Roller

Total posts: 10
posted October 26, 2004 09:19 PM  
you might try making sure the fuel pick up is in the right rear corner, also if you can ,try to get 1/2"fuel line from the tank to the carb.hope this helps with the car coming out of the corners with no hesitation.for the car having problems on the last part of the straight, you may be floating the valves, also check for loose wires on the battery or try unhooking the tach and see if the problem goes away.good luck, drive it like you stole it

    

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