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Jetting with VH4-1 and KNfilter
- squints
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would bumping it up to a 125 main be an appropriate adjustment to bring things back to normal.
Is any other carb adjustment needed?
traded my classic Kz's for a 2001 Kz1200r
Upstate NY
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- roy-b-boy-b
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1979 LTD Street Fighter.1977 KZ1000
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- Buda
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hope that helps you.
Tom
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
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- TeK9iNe
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Well, theres no way to just guess the correct jets.
Your speaking of the K&N insert filter I'm assuming?
If it was ok before, but now its lost power, then its lean.
Get some mains like 130, 135, 140.
A size up on the pilot should be fine if it idled ok before.
Start with the main by doing some wot pulls with the 140. Then go down to the 135. If it improves, great. Try the 130's. If it doesnt inprove then put the 140 back in. Lots of guys have had good success with that one, and it should be rich enough.
Do the needle next with half throttle pulls. Then move the needle clip up a slot and see if it improves... You get my drift.
Setting the pilot mixture/air screws: My method is to have the bike idling, then give it a 1/4 throttle blip. If the rpms fall below the idle rpm, lean the screw a 1/4 turn then repeat. If it hangs obove the idle then rich the screw.
I find this gives the best off-idle feel while riding.
Good Luck and patience...
Cheers.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- squints
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its idleing fine, is it still nessary to change to pilot jet?
wow, a 140 main, a KN really makes that much difference?
btw, wishful thinking here, but is there some secret way to change jets without removing the entire stinkin carb rack?:laugh:
traded my classic Kz's for a 2001 Kz1200r
Upstate NY
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- Buda
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Tom
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
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- ArthurGoVroom
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- I'd rather ride it than shine it
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btw, wishful thinking here, but is there some secret way to change jets without removing the entire stinkin carb rack?:laugh:
I replaced my carb bowl screws with allen head screws. I bought a bag of them from McMaster-Carr, along with lock washers to fit them, and installed the allen screws the last time I had my carbs off. I then took the right sized key off of one of those folding multi-size hex key sets, they have a loop bent in the end where they fold into the holder, I stick a stubby screwdriver in the hole and use it to get enough twisting force to loosen/tighten the bowl screws while they're on the bike. With the allen screws I can be sure of how tight I'm getting the screws, as opposed to slipping with a phillips and hoping.
If you're lucky you can get the phillips screws removed from the carbs while they're installed, then replace with allen bolts if you desire. Once the bowls are off, I just use an 8mm (or 5/16") box end wrench to remove the intermediate jet which has the main jet screwed into it, then hold the intermediate in the wrench while using a screwdriver to get the main jet out of it. The main jet is too close to the top of the transmission to fit a stubby screwdriver in there, so removing the intermediate/main together is the way to go.
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits
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- squints
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thanks
traded my classic Kz's for a 2001 Kz1200r
Upstate NY
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- Buda
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like night and day. :woohoo:
Tom
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
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- squints
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traded my classic Kz's for a 2001 Kz1200r
Upstate NY
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- TeK9iNe
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scootrs.com/tech.cfm?tip=tunecarb
Jetting can be easy if you have patience and time. Seat of the pants tuning is the best.
Just remember, 1 change at a time!
Cheers, goodluck!
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- squints
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traded my classic Kz's for a 2001 Kz1200r
Upstate NY
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