Not Running When Belt Engaged

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Not Running When Belt Engaged

Postby imelmo » Sun Nov 18, 2018 5:19 pm

Tried to make our first test hits with my Nephew in his junior dragster today. The car started and idled fine so we took it outside. Then it would kill right after putting the belt on if the brake is pressed or we hold the car still. Seems like it would stay running if I let it roll. Also noticed there was fuel coming out of the air filter. New clutch system and new carb. Where should I start looking?

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Re: Not Running When Belt Engaged

Postby WILD BILL » Sun Nov 18, 2018 5:31 pm

Need to know what type of clutch motor and carb we're talking about here smiley-lol

2 things I can think of off the top of my head.

First is the belt being way to tight could cause that, The second being the drive clutch engaging at to low an RPM can also.

Fire it up with the belt off and watch to see if the primary snaps in and stays in while idling around 3500 to 3800 RPM. If it does, you need to address the clutch.

If not Loosen the belt tension a bit. You want it tight enough that the car will creep when the brake is released (no throttle input) but not so tight that it will squeal.


As for the carb, First thing I would do is take it apart and give it a good cleaning.



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Re: Not Running When Belt Engaged

Postby drags3078 » Mon Nov 19, 2018 5:05 pm

I was thinking belt to tight ( center to center ) also

Could the fuel from the air cleaner be from the engine stopping ?? Does carburetor sit level or at a angle ??

how long of a warm up did you give it before you tried to take off ??
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Re: Not Running When Belt Engaged

Postby slowgoat » Fri Nov 23, 2018 3:02 am

Seen this a few times, more than likely the belt is too wide
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Re: Not Running When Belt Engaged

Postby Jr_Uncle » Thu Dec 06, 2018 3:38 pm

I had this happen once, I had a spacer behind the drive clutch and forgot to put it back in causing the belt alignment to be way off.
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