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3AJ Running Rough 3AJ Running Rough
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 4 Nov 2007
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3AJ Running Rough
Hi Guys, did a top end rebuild recently, set the carb up according to yamaha workshop manual. Bike runs fine going through the gears - but - at about 70mph cruising, the bike feels like it is running out of fuel and occasionally backfires.

The pilot screw was set to two turns out, I adjusted it to 3 turns out- no difference. Any help/ideas would be appreciated.
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Old 4 Nov 2007
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Hi.

Have you had a look at your airfilter lately? Had the same problem after I rebuilt my bike,and started it up.After I cleaned the airfilter and adjusted the secundstage opening the bike run fine again.

Cheers.

Tom
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Old 5 Nov 2007
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The pilot screw will have little effect. Its predominantly only used when the bike is idleing.

Backfiring is a sign of a lean mixture (too much air) but dont confuse this with over run which is common with singles.

Do you have the standard exhaust on ??
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Old 5 Nov 2007
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Were those carby mounting blocks OK? Seems to be a common problem. They will make your bike run lean if they leak.

Steve
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Old 5 Nov 2007
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Hi Ted, I met u at HUUK. (Blue 3aj, camped at the top of the field, bike was burning oil then). Whats over run? and what can I do about a lean mixture
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Old 5 Nov 2007
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Originally Posted by Dave O View Post
Hi Ted, I met u at HUUK. (Blue 3aj, camped at the top of the field, bike was burning oil then). Whats over run? and what can I do about a lean mixture
To start with, put the pilot back where it was. As long as it starts fine and idles fine with the stock pilot setting, just leave well alone !

Did you sort the oil leak ??.. Perhaps it was just condensation ???

The best way to determine if its running lean or rich is to find a garage with a gas analyser to "sniff" your exhaust.

Failing that, you could try moving the little Circlip on the needle adjustment on the carb. Dropping it down a notch will make the open throttle position a little richer.

Have you got the standard exhaust on ??? Is the air filter clean ?? are the carb rubbers in good condition and tight ??

Overrun is slight popping when you shut the thottle on a big single "bom bom bom" etc

I would set your carb and bike to as close as stock as possible then make small adjustments to the fueling.

Also check your tank is breathing ok (no trapped breather pipes etc)
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