Carb Confusion
03-17-2012, 01:33 PM
#1
Junior Member
Squid
Thread Starter
Join Date: Mar 2011
Posts: 9
Carb Confusion
My 97 Euro model SH has the stock air filter, Scorpoin high pipes with baffles. I have shimmed the needles .030+.040, 48 pilot, and plugged one front slide hole
and blocked off PAIRS as recommended by 8541Hawk. It runs OK but too rich and gas mileage is 25% less. The problem may be that it has different model carbs than US models:VTPOB instead of VTP1A(Cal.)VPT2A(49state) and different needles:front A1UD,rear A1UC instead of A1UF,A1UE. My bike came with 45 pilots were were changed to 48s in 98 but the carb model changed also.
I had the idea to remove the shims, leave the 48 pilots in and the plugged slide hole. If anyone has any ideas, or has experience with this carb confusion I would appreciate your input. Thanks
and blocked off PAIRS as recommended by 8541Hawk. It runs OK but too rich and gas mileage is 25% less. The problem may be that it has different model carbs than US models:VTPOB instead of VTP1A(Cal.)VPT2A(49state) and different needles:front A1UD,rear A1UC instead of A1UF,A1UE. My bike came with 45 pilots were were changed to 48s in 98 but the carb model changed also.
I had the idea to remove the shims, leave the 48 pilots in and the plugged slide hole. If anyone has any ideas, or has experience with this carb confusion I would appreciate your input. Thanks
03-17-2012, 09:09 PM
#4
Senior Member
Superstock
Join Date: Oct 2011
Location: Pompano Beach, Fl.
Posts: 273
Float Valves
My 97 Euro model SH has the stock air filter, Scorpoin high pipes with baffles. I have shimmed the needles .030+.040, 48 pilot, and plugged one front slide hole
and blocked off PAIRS as recommended by 8541Hawk. It runs OK but too rich and gas mileage is 25% less. The problem may be that it has different model carbs than US models:VTPOB instead of VTP1A(Cal.)VPT2A(49state) and different needles:front A1UD,rear A1UC instead of A1UF,A1UE. My bike came with 45 pilots were were changed to 48s in 98 but the carb model changed also.
I had the idea to remove the shims, leave the 48 pilots in and the plugged slide hole. If anyone has any ideas, or has experience with this carb confusion I would appreciate your input. Thanks
and blocked off PAIRS as recommended by 8541Hawk. It runs OK but too rich and gas mileage is 25% less. The problem may be that it has different model carbs than US models:VTPOB instead of VTP1A(Cal.)VPT2A(49state) and different needles:front A1UD,rear A1UC instead of A1UF,A1UE. My bike came with 45 pilots were were changed to 48s in 98 but the carb model changed also.
I had the idea to remove the shims, leave the 48 pilots in and the plugged slide hole. If anyone has any ideas, or has experience with this carb confusion I would appreciate your input. Thanks
03-18-2012, 12:29 PM
#5
Junior Member
Squid
Thread Starter
Join Date: Mar 2011
Posts: 9
carb cnfusion
about the pilot screw settings: a Honda mechanic in my town led me to believe that the pilot screws are air screws and that turning them out is leaning the mix
so I set them at the Honda spec of 2 3/4 turns out. I started at 2 1/4 front and 2 1/2 rear and it runs a little better I think, although I am still hoping one of you SH experts will help me get on the right track. I checked the float valves and they are OK.
so I set them at the Honda spec of 2 3/4 turns out. I started at 2 1/4 front and 2 1/2 rear and it runs a little better I think, although I am still hoping one of you SH experts will help me get on the right track. I checked the float valves and they are OK.
Last edited by MarkN; 03-18-2012 at 12:31 PM. Reason: forgot something
03-30-2012, 01:43 PM
#6
Junior Member
Squid
Thread Starter
Join Date: Mar 2011
Posts: 9
end of the thread
To answer my own question: I took the carbs off for the third time and removed the .030 + .040 needle shims, I left the 48 pilot jets in and the plugged front slide hole. The bike runs really well and now I can get on with the suspension work. I found an öhlins shock and I got a Racetech full kit for the front. Thanks for your input guys. Mark
04-17-2012, 04:06 PM
#7
Seasoned tech
SuperSport
Join Date: Apr 2012
Location: Issaquah, WA
Posts: 576
about the pilot screw settings: a Honda mechanic in my town led me to believe that the pilot screws are air screws and that turning them out is leaning the mix
so I set them at the Honda spec of 2 3/4 turns out. I started at 2 1/4 front and 2 1/2 rear and it runs a little better I think, although I am still hoping one of you SH experts will help me get on the right track. I checked the float valves and they are OK.
so I set them at the Honda spec of 2 3/4 turns out. I started at 2 1/4 front and 2 1/2 rear and it runs a little better I think, although I am still hoping one of you SH experts will help me get on the right track. I checked the float valves and they are OK.
Generally air screws are on two stroke dirt bikes, and most 4 stroke bikes including ever streetbike I can remember have fuel screws.
It sounds like you got your issue fixed but everything you did would richen up the mixtures, so just back it off a bit and you should be good as it sounds like you've done.
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