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45 slow jet

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  #1  
Old 01-09-2001 | 01:29 AM
pudjumper's Avatar
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I've read where alot of guys/gals are running 42 slow jets in their 440's. At 700' or thereof, my engine builder put a 45 slow jet in my 12:1, ported, 450/450 cammed 440. I am concerned that this might be the wrong size. What should I be looking for with incorrect slow jetting. I have not yet had the chance to get a plug reading for bad weather still looms.
 
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Old 01-09-2001 | 01:06 PM
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If the 45 is too big it will sputter when you take off.But as long as it dosen't do that it should be fine.I would rather have it a little rich than lean.
 
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Old 01-09-2001 | 02:06 PM
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Pilot jet my friend and yes it affects 1 quarter to almost half throttle.
 
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Old 01-10-2001 | 01:21 PM
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it shouldn't be a problem, I'm running a 45 on a stock motor @ 1200ft. I had a Yamaha mechanic sell it to me when I had a hard time finding pilots and he said to "dial it in" with the mixture screw. Now I can start that baby with no choke below zero!
 
  #5  
Old 01-13-2001 | 09:19 PM
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Pudjumper, dont wory about it your bike is slow anyway...LOL
 
  #6  
Old 01-14-2001 | 10:40 AM
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not to start a big raptor vs 400 thing again. But yesterday i was riding with a raptor and he was a little faster than me, like in mid throttle. But i could hang with him pinned on the road!! i was surprised.. wonder what a cam will do for me

everyone that was riding with us also said that i landed softer than him, and that i got a little higher.

I'll admit that i like the raptor, and it feels powerful as heck. but we were on a flat road and he couldn't hit the rev limiter in his top gear, and i was totally pinned. Should have seen the look on his face when he looked back to see that he dusted me by 3 foot, lol.

no doubt about it tho, raptor is ideal for XC
 
  #7  
Old 01-14-2001 | 12:14 PM
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Hey Krzy I was just joking about his 440. Pudjumper has a bad bike. With my 12t I could not catch back up with him after the start.
 
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