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  #1  
Old 07-11-2008
cagaroni's Avatar
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Join Date: Feb 2005
Posts: 3,315
20mm carb on the XR Fiddy


i just put a Keihin 20mm carb knockoff on the fiddy and was wondering what main jet people are running with the 88cc BB kit. It came stock with a 89 main but I'm running 102 - 105 mains on my PHBG & PHVB 19's on the pocketbikes.

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Old 07-15-2008
coax's Avatar
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Join Date: Aug 2005
Age: 43
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Re: 20mm carb on the XR Fiddy

Try a 95 and work your way down. I run a 85 MJ on a TB 88 with racehead and a 90 MJ on a 107cc, but I race from 5400-6900 ft. ASL.
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Old 07-19-2008
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Re: 20mm carb on the XR Fiddy

here are some symptoms i'm running into with the new carb, also got a TB 88cc kit (stock head) and a Big Gun pipe on it :

1. will not start with choke (too rich on pilot?)
2. need to turn idle screw way up to start it, then i have to turn it way down so it doesnt blow up lol (too lean on main?)
3. smoke pouring out the crankcase breather vent (rings bad, getting blow by?)
4. currently running a 101 main.. started with a 89, dropped to a 82 then went up to a 95 and now at 101...will try a 116 next. I'm getting alot of bog off the line when i whack the throttle and slight hesitation at 3/4, thought it was too rich but now think its too lean as there is a lot of air being dumped when i whack the throttle. I started with needle in 3rd notch down, then tried 2nd down and now im at 5th down (richest).
5. running a 32 pilot 1.5 turns out (started with a 35 pilot)
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Old 07-19-2008
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Re: 20mm carb on the XR Fiddy

I'm also ~ 460ft ASL..

i pulled the choke closed at wot while under load and it started to shut off & die so i guess i'm a little rich on the main jet..
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