125 jet
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125 jet
the left plug is with a 120 jet with stock exhaust. After I drilled the pipe, I had a lean surge on the freeway.
the right plug is with a 125 jet and drilled exhaust. It still looks very lean and I peak at 80mph instead of 85mph.
I'm off to get the next size up jet. Comments?
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RE: 125 jet
Get the N1TC needle, collar, and circlip while your at the dealer. That'll give you some more fine tuning options.
I have not had a chance to do a plug check yet (I'm out of town at the moment) but mine has no lean surge with the 122 jet, high flow snorkle, and 1/2" hole in the first plate. I may try the 125 just for grins if I get a chance.
I have not had a chance to do a plug check yet (I'm out of town at the moment) but mine has no lean surge with the 122 jet, high flow snorkle, and 1/2" hole in the first plate. I may try the 125 just for grins if I get a chance.
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RE: 125 jet
ORIGINAL: bmwhd
Get the N1TC needle, collar, and circlip while your at the dealer. That'll give you some more fine tuning options.
I have not had a chance to do a plug check yet (I'm out of town at the moment) but mine has no lean surge with the 122 jet, high flow snorkle, and 1/2" hole in the first plate. I may try the 125 just for grins if I get a chance.
Get the N1TC needle, collar, and circlip while your at the dealer. That'll give you some more fine tuning options.
I have not had a chance to do a plug check yet (I'm out of town at the moment) but mine has no lean surge with the 122 jet, high flow snorkle, and 1/2" hole in the first plate. I may try the 125 just for grins if I get a chance.
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RE: 125 jet
I'm a few hunderd feet above sea level. With an after market exhaust and header (both from FSW) I tried the 132, but it was too rich -- turned my plug pitch black. I'm currently running a 128 and so far it seems right -- but I haven't checked the plug yet. I was actually thinking of trying a 125 for kicks, but hearing your post I think I'll just stick with the 128.
By the way, can anyone explain what a "lean surge" is???
By the way, can anyone explain what a "lean surge" is???
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Joined: Dec 2005
Posts: 1,262
From: Just South of the Ocala Nationa Forest
RE: 125 jet
a16tony,
The way you're doing it takes a whole lot of time. But it is one of the more accurate ways of jetting the bike.
The other way is on a dyno with a sniffer up the exhaust. You can get it spot on then.
The way I used to do it was take it to the track. Watch your mph on each pass. Keep increasing jet size until your mph does not increase any more. Drop down one size. Should be perfect.
The way you're doing it takes a whole lot of time. But it is one of the more accurate ways of jetting the bike.
The other way is on a dyno with a sniffer up the exhaust. You can get it spot on then.
The way I used to do it was take it to the track. Watch your mph on each pass. Keep increasing jet size until your mph does not increase any more. Drop down one size. Should be perfect.
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RE: 125 jet
ORIGINAL: Marty
a16tony,
The way you're doing it takes a whole lot of time. But it is one of the more accurate ways of jetting the bike.
The other way is on a dyno with a sniffer up the exhaust. You can get it spot on then.
The way I used to do it was take it to the track. Watch your mph on each pass. Keep increasing jet size until your mph does not increase any more. Drop down one size. Should be perfect.
a16tony,
The way you're doing it takes a whole lot of time. But it is one of the more accurate ways of jetting the bike.
The other way is on a dyno with a sniffer up the exhaust. You can get it spot on then.
The way I used to do it was take it to the track. Watch your mph on each pass. Keep increasing jet size until your mph does not increase any more. Drop down one size. Should be perfect.
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RE: 125 jet
ORIGINAL: NavKLX
I'm a few hunderd feet above sea level. With an after market exhaust and header (both from FSW) I tried the 132, but it was too rich -- turned my plug pitch black. I'm currently running a 128 and so far it seems right -- but I haven't checked the plug yet. I was actually thinking of trying a 125 for kicks, but hearing your post I think I'll just stick with the 128.
By the way, can anyone explain what a "lean surge" is???
I'm a few hunderd feet above sea level. With an after market exhaust and header (both from FSW) I tried the 132, but it was too rich -- turned my plug pitch black. I'm currently running a 128 and so far it seems right -- but I haven't checked the plug yet. I was actually thinking of trying a 125 for kicks, but hearing your post I think I'll just stick with the 128.
By the way, can anyone explain what a "lean surge" is???
