Need help with jetting
Aug 15, 2017 | 09:23 AM
#1
Thread Starter
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Weekend Warrior
Joined: Aug 2017
Posts: 7
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Need help with jetting
Hi guys very new to this i just bought 2 banshees,they are both 2000 onw has a 34mm keihin pj carb with t5 pipes k and n filters and suposobly it has been ported i live in los angeles at the moment temperature is around 85 at sea level what do you guys think my pilot and main jets should be everything else is stock.
The other one has 28mm pwk carbs with kand n filters and fmf pipes same question what my jetting should be
The other one has 28mm pwk carbs with kand n filters and fmf pipes same question what my jetting should be
Aug 15, 2017 | 10:25 AM
#2
Pro Rider
Joined: Oct 2015
Posts: 1,107
Likes: 1
How are they running? I'm guessing something doesn't feel right or why would you be asking. Because these are larger than stock and both machines are modified there is no real baseline so asking what your jetting should be is a tough one. You may find some success on a banshee specific site with similar modes...but the porting (amount of) can make a big difference.
If you don't have an A/F pipe sniffer then you can always do a plug chop (at least to get the main close)...if you are unfamiliar let me know and I'll walk you through it...
If you don't have an A/F pipe sniffer then you can always do a plug chop (at least to get the main close)...if you are unfamiliar let me know and I'll walk you through it...
Aug 15, 2017 | 11:28 AM
#6
Thread Starter
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Weekend Warrior
Joined: Aug 2017
Posts: 7
Likes: 0
Hi guys very new to this i just bought 2 banshees,they are both 2000 onw has a 34mm keihin pj carb with t5 pipes k and n filters and suposobly it has been ported i live in los angeles at the moment temperature is around 85 at sea level what do you guys think my pilot and main jets should be everything else is stock.
The other one has 28mm pwk carbs with kand n filters and fmf pipes same question what my jetting should be
The other one has 28mm pwk carbs with kand n filters and fmf pipes same question what my jetting should be
How are they running? I'm guessing something doesn't feel right or why would you be asking. Because these are larger than stock and both machines are modified there is no real baseline so asking what your jetting should be is a tough one. You may find some success on a banshee specific site with similar modes...but the porting (amount of) can make a big difference.
If you don't have an A/F pipe sniffer then you can always do a plug chop (at least to get the main close)...if you are unfamiliar let me know and I'll walk you through it...
If you don't have an A/F pipe sniffer then you can always do a plug chop (at least to get the main close)...if you are unfamiliar let me know and I'll walk you through it...
Aug 15, 2017 | 12:19 PM
#7
Pro Rider
Joined: Oct 2015
Posts: 1,107
Likes: 1
an a/f sniffer is a wideband o2 detector...it measures the a/f ratio...that's what a dyno shop/mechanic would use.
The best way to tell if you're lean/rich at the main is to do a plug chop:
1) warm the machine up
2) find a long stretch of open ground
3) run it at WOT for a good ways
4) while at WOT kill the engine and release throttle at same time
5) pull the plugs...looking for tan color like cardboard...if whitish go up 2 jet sizes...if darker go down 1 jet size...running a little rich (darker) is ok, running lean is not ok...
this takes patience and time...you may find the 160's are ok...you may not...but you need a baseline to work from before doing anything!!!
The best way to tell if you're lean/rich at the main is to do a plug chop:
1) warm the machine up
2) find a long stretch of open ground
3) run it at WOT for a good ways
4) while at WOT kill the engine and release throttle at same time
5) pull the plugs...looking for tan color like cardboard...if whitish go up 2 jet sizes...if darker go down 1 jet size...running a little rich (darker) is ok, running lean is not ok...
this takes patience and time...you may find the 160's are ok...you may not...but you need a baseline to work from before doing anything!!!