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Author Topic: compu fire ignition  (Read 3260 times)
pimp incher too
Newbie
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Posts: 24


« on: March 25, 2008, 16:28:33 pm »

anybody knows till howmuch rpm the compu fire igintion works,becouse it looks like that i have a rpm limiter and i think that it is the ignition?
<a href="http://www.youtube.com/v/hbTABFv29QM" target="_blank">http://www.youtube.com/v/hbTABFv29QM</a>

regards,leslie
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Torben Alstrup
Hero Member
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Posts: 716


« Reply #1 on: March 26, 2008, 09:49:47 am »

8000+ rpm
Its most likely a bad wire or your rotor.
t
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pimp incher too
Newbie
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Posts: 24


« Reply #2 on: April 05, 2008, 11:00:23 am »

the rotor is new and the wires are from msd and works well.
when i turn the linkage full open then also come the feul 40-50cm out off my carbs? the engine is not yet dynotested/jetted,maybe that will bring a solution?
this 2098cc engine is 74x95 and i maked everything light as possible. the counterweigtcranck weights the same as std 69 cranck,i used yamaha pistons,D-ported heads with alu-bronze valve seats. maybe the 95 cilinders is to big for the 74 cranck? the first times he run he did 9500rpm but then the valve spring broken,now i putted berg springs on it. the 9500rpm was also with another ignition,thats why i think it is the igntion.

leslie
« Last Edit: April 05, 2008, 11:03:07 am by pimp incher too » Logged
LGK
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Posts: 142



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« Reply #3 on: April 05, 2008, 11:38:32 am »

the rotor is new and the wires are from msd and works well.
when i turn the linkage full open then also come the feul 40-50cm out off my carbs? the engine is not yet dynotested/jetted,maybe that will bring a solution?
this 2098cc engine is 74x95 and i maked everything light as possible. the counterweigtcranck weights the same as std 69 cranck,i used yamaha pistons,D-ported heads with alu-bronze valve seats. maybe the 95 cilinders is to big for the 74 cranck? the first times he run he did 9500rpm but then the valve spring broken,now i putted berg springs on it. the 9500rpm was also with another ignition,thats why i think it is the igntion.

leslie

Les,

You need some fine dynotuning,nothing wrong with a compufire.it's all in the jetting believe me.

Steve
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LGK
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Posts: 142



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« Reply #4 on: April 05, 2008, 11:42:34 am »

One more thing,forget about the BERG duals ,at 8K + they won't survive,absolutely not.Can you give more specs on the valvelift etc...that would help ?

Steve
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pimp incher too
Newbie
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Posts: 24


« Reply #5 on: April 06, 2008, 17:34:50 pm »

the camshaft is engle w125 with lightweight lifters,aluminium push rods and std rockers,also make my valves much lighter 43x38.

what shoud go wrong with the berg springs @8k? would they get broken?

thanks,leslie
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Jordy/DVK
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Posts: 464



« Reply #6 on: April 18, 2008, 12:40:12 pm »


 I like your "lightweight" approach. Smiley
 What barrels did you use with the Yamaha pistons?
 Did you use some Mahle barrels and open them up?
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pimp incher too
Newbie
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Posts: 24


« Reply #7 on: April 18, 2008, 13:33:47 pm »

yes,i bored 8 cilinders from 94mm up to 95mm and i took the 4best.

i took another exaust and now the carburator don't push so much fuel out. the one on the movie is from a bike with katalysator in and it is to much pressure behind. now it runs better.
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