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TURBO H2
 Post subject: engine won't run
PostPosted: Tue Aug 14, 2012 7:29 am 

Joined: Tue Aug 14, 2012 7:08 am
Posts: 2
Friend called and said his new engine build won't run. We have both been racing for over 40 years and I have never seen one of these engines that wouldn't start. Starts when fuel is sprayed in carbs, but as soon as fuel burns off, engine will only idle. Try to throttle up, engine dies. The only new part, from when the engine was last raced, is a new crank! checked index, found to be right. good spark, fresh fuel, timing right on. Bike went from 8:50s to not starting, after instaling new crank. Any Ideas.


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Walms
 Post subject: Re: engine won't run
PostPosted: Tue Aug 14, 2012 8:26 am 
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Joined: Wed Jun 08, 2011 10:04 pm
Posts: 2223
Location: Just north of Toronto, Ontario
Maybe check the float levels and at the same time, make sure you have good fuel flow out of the tank.

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TURBO H2
 Post subject: Re: engine won't run
PostPosted: Tue Aug 14, 2012 10:46 am 

Joined: Tue Aug 14, 2012 7:08 am
Posts: 2
floats are good and electric pump. How would this thing act if the seals are bad?
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Ja-Moo
 Post subject: Re: engine won't run
PostPosted: Tue Aug 14, 2012 11:06 am 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
TURBO H2 wrote:
floats are good and electric pump. How would this thing act if the seals are bad?


It depends on how bad they are, if not totaled, it should start. Can you feel suction on the carb when turning over the motor? And did you clean the carbs, no idle is usually clogged pilot jets.....

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Zambia
 Post subject: Re: engine won't run
PostPosted: Tue Aug 14, 2012 9:01 pm 
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Joined: Wed Jun 08, 2011 10:08 pm
Posts: 1901
Location: Campbellville Ontario
There was another member who had a similar issue with a drag motor. It turned out to be bad lab seals on the rebuild. He did the crank again with rubber seals and....viola.
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yellowsnow
 Post subject: Re: engine won't run
PostPosted: Tue Aug 14, 2012 10:44 pm 
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Joined: Sun Jul 17, 2011 8:26 pm
Posts: 227
Location: Breese, IL
If they are similar to stock carburetors, I have had this problem and it turned out to be when I slipped the throttle slides in the top of the carbs one of the cables slipped out of place to where when twisting the throttle only 2 slides went up.
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m in sc
 Post subject: Re: engine won't run
PostPosted: Fri Aug 17, 2012 2:27 pm 
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Joined: Wed Jun 08, 2011 10:12 pm
Posts: 2169
MAKE SURE plug wires didnt get crossed. when it starts does it sound crap? if 1 & 3 are swapped it will fire but backfire and not 'run' for more than a second or 2.
seen that one happen a lot.
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ThreePipesSmokin
 Post subject: Re: engine won't run
PostPosted: Fri Aug 17, 2012 9:10 pm 
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Joined: Wed Jun 08, 2011 10:28 pm
Posts: 1575
Location: Tampa Bay Florida
m in sc wrote:
MAKE SURE plug wires didnt get crossed. when it starts does it sound crap? if 1 & 3 are swapped it will fire but backfire and not 'run' for more than a second or 2.
seen that one happen a lot.

:oops: :oops: :oops:

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m in sc
 Post subject: Re: engine won't run
PostPosted: Sat Aug 18, 2012 7:20 am 
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Joined: Wed Jun 08, 2011 10:12 pm
Posts: 2169
hehe. forgot about that bill. had to deal with it again only a week ago on phils 'new' 74. I swear 30% of the bikes i have run across were parked for that reason after a rebuild. after we got phils bike firing right it was quiet as a sewing machine. crazy
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ThreePipesSmokin
 Post subject: Re: engine won't run
PostPosted: Sat Aug 18, 2012 8:47 am 
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Joined: Wed Jun 08, 2011 10:28 pm
Posts: 1575
Location: Tampa Bay Florida
QUIET!?!? :o A set of chambers will fix that!!! :mrgreen:

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