SDKimo
Adjunct
Reged: 07/02/06
Posts: 718
Loc: Huntington Beach, CA
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Here is my guess on carb bikes: the intake conditions change and the fuel intake varies so the bike idle changes....you just noticed it when you put the wrap on the pipes...it was all way there...
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Captain_Midnight
Adjunct
Reged: 02/07/09
Posts: 234
Loc: Seattle, WA
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I only noticed the problem immediately after I wrapped the pipes. I have no airbox, just K&N filters. My first thought is that it is a coincidence. I replaced the copper gaskets when I put the pipes back on and snugged them down very well with blue loctite. I'm going to fiddle with the A/F screws and see if that doesn't made a difference. I just wanted to get some other people's opinions before I started tinkering on it to make sure there isn't something else I might be overlooking.
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SDKimo
Adjunct
Reged: 07/02/06
Posts: 718
Loc: Huntington Beach, CA
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I did the same as you...took the pipes off wrapped them, installed new gaskets and torqued everything...
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Zmilin
Saddle Sore
Reged: 03/02/07
Posts: 5109
Loc: Sammamish, Washington - USA
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Before it was surging, what RPM was your idle set?
Does it do it if the choke is pulled after its warmed up?
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07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
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Captain_Midnight
Adjunct
Reged: 02/07/09
Posts: 234
Loc: Seattle, WA
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Idle was set around 1000rpms. If I pull the choke the surging stops.
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Zmilin
Saddle Sore
Reged: 03/02/07
Posts: 5109
Loc: Sammamish, Washington - USA
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Sound like you need a bit more fuel and maybe a carb balancing.
Have you cleaned your filters lately? Try that as well.
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07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
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Captain_Midnight
Adjunct
Reged: 02/07/09
Posts: 234
Loc: Seattle, WA
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Good call. I recently cleaned the filters, so I doubt that's the problem. I turned my a/f screws a quarter turn out, and it feels a little better, but still surging. Next I went out and bought some vacuum gauges. When I went to balance the carbs I discover that my carbs don't have an adjustment screw where the service manual says it should be. In fact my carbs look just like the pics in the manual except for the adjuster. Anyone know where that sucker is located?
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Zmilin
Saddle Sore
Reged: 03/02/07
Posts: 5109
Loc: Sammamish, Washington - USA
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Its the screw on the inside of the right side carb, its got yellow paint on it.
On the bike its locate on the left side carb.
Turn your idle up to about 1500 when adjusting it. Its very sensitive to adjustment and pressure.
If you've never down it read Dinquas carb adjustment page here: Carb balancing
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07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
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Captain_Midnight
Adjunct
Reged: 02/07/09
Posts: 234
Loc: Seattle, WA
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That's exactly what I was looking for. Thanks Z, I owe you a beer next time I see you!
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B02S4
Learned Hand
Reged: 02/28/08
Posts: 1536
Loc: USA
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Quote:
...I turned my air screws...
Fuel screws, not air screws.
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