Power User
Roostin Away
Me and my friend are trying to figure out how to fix his carb, it will idle good but when you give it gas it revs up fine but then hesitates to drop back down to normal idle rpm's. We lowered the needle clip all the way down and that made the difference between dying and idling. Played with the mixture screw and airbox on/off. Im just curious how to fix this since my engine did the same thing and I never figured out how to fix it. Thanks
1986 200x- old school D.I.D wheels, Gold D.I.D X-Ring Chain, Rad MFG. Carrier, PRM Grab Bar, Pro Circuit T-4 custom, Maier plastics, 85x forks, 18x10.5x8 kenda klaw mxr's on itp steels, the money pit never ends
2004 YFZ450 - CP 12.5:1, cam mod , gibson nerfs, hmf pipe, protaper bars + risers, dg bumper/skids, holeshot gncc's on itps, cycra handguard and more stuff to come.
Got The Holeshot
Arm chair racerJust too addicted
When your engine is idling,play with the air screw.Note if the is a difference on idling when you screw it completly.Maybe need to adjust fuel level,dirty carb
Check the intake for crack in rubber.Ignition timming
1986 ATC500X
1985 ATC250SX
1985 ATC200X
1985 ATC250R
1986 ATC250R
1984 ATC250R
1981 ATC70
1984 ATC70
1985 ATC70
Custom built ATC70 / 250R laydwon swap
1986 ATC250SX FATCAT
Power User
Roostin Away
There is a difference. When you screw it in all the way and lean it out it idles very high. When you screw it out a few turns it idle but stays revved up longer. Finally when its out another 1/2 turn it floods out and will not idle. The carb was just rebuilt and fully cleaned. There are no cracks in the intake boot or anything. I see how an air leak could cause this but Im almost positive this isnt the case. Im guessing the carb just needs tuned up, but I never had this problem before and dont know how to solve it.
1986 200x- old school D.I.D wheels, Gold D.I.D X-Ring Chain, Rad MFG. Carrier, PRM Grab Bar, Pro Circuit T-4 custom, Maier plastics, 85x forks, 18x10.5x8 kenda klaw mxr's on itp steels, the money pit never ends
2004 YFZ450 - CP 12.5:1, cam mod , gibson nerfs, hmf pipe, protaper bars + risers, dg bumper/skids, holeshot gncc's on itps, cycra handguard and more stuff to come.
Power User
Got the holeshot
First clean the slow jet real good and run a small peice of wire through it to clear any stuck in crud.
There should be a rubber o-ring on the mixture screw. If the o-ring is missing it'll never adjust right.
Another thing to look at is valve adjustment. < assuming its a 4-stroke
What engine are we talking about?
The person who says it cannot be done should not interrupt the person who is doing it.
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85 ATC350X
85 ATC200X
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Power User
Roostin Away
The engine is a 1987 200x engine. The valves have never been adjusted in it before while he has owned it I know. The carb has been throughly cleaned with everything completely taken apart and soaked, scraped through and blown out.
1986 200x- old school D.I.D wheels, Gold D.I.D X-Ring Chain, Rad MFG. Carrier, PRM Grab Bar, Pro Circuit T-4 custom, Maier plastics, 85x forks, 18x10.5x8 kenda klaw mxr's on itp steels, the money pit never ends
2004 YFZ450 - CP 12.5:1, cam mod , gibson nerfs, hmf pipe, protaper bars + risers, dg bumper/skids, holeshot gncc's on itps, cycra handguard and more stuff to come.
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