Xt600 carb runs oddly

Airbox, Fuelpump, Carburettor
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scottieh
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Joined: Wed Mar 30, 2011 3:58 am
What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Xt600 carb runs oddly

Post by scottieh » Fri Jul 28, 2017 6:29 pm

My girlfriend's xt600 has had some odd carb issues ever since i first bought it. Nothing debilitating but now that we're about to embark on a long trip next month it's time to fix it.

To start with the carb will sometimes idle around 2000 rpm and other times around 1600 rpm. When reved up the idle sits high and then sometimes it drops down. Other times it doesn't.

Second problem is that the bike dies at idle occasionally, especially after altitude changes. We've taken to adjusting the fuel screw to compensate for the altitude changes (3000+ feet changes sometimes) but my bike doesn't do this. I don't need to adjust the carb at all even up to 14,000 feet.

Third is that the throttle sticks when trying to accelerate. I've cleaned the throttle body, oiled the cables and cleaned the springs and carb body and the throttle turns easily when the engine isn't running, but acceleration can cause it to stick.

Finally, at highway speeds around 60mph, when trying accelerate the bike stumbles and feels like it has a fuel starvation problem. The secondary jet is 130 i think.

We have cleaned the carb many times, adjusted the float, and synced the carbs. Looking for tips on any of these issues. We will try swapping my carb to her bike and see if that changes anything. :oilleak:

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scottieh
Financial
Financial
Posts: 429
Joined: Wed Mar 30, 2011 3:58 am
What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Re: Xt600 carb runs oddly

Post by scottieh » Wed Aug 09, 2017 11:39 pm

Did the carb swap and the issue was definitely inside the carb. I had a spare carb from a parts bike that i cleaned up and used the best parts of both but mainly the body of the spare. It runs so much better now. Was even pleasantly surprised to find a 140 main jet and now the bike really flies. The body swap solved the sticky throttle, dying at idle, and the high speed hiccups. I still have a hanging idle but it's not as bad. What causes hanging idle if it's not in the carb and the throttle cables are properly retracting?

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xtrider
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Joined: Mon Jun 17, 2013 11:21 pm
What Bike or Bikes Do You Own?: 88 XT600 Yamaha , , 525XC KTM, '96 Kawasaki KLX650 , '05 Suzuki DRZ400, Suzuki LTR450
Previously Owned Bikes: 91 DR 650 Suzuki, 81 DS250 Suzuki, 73 ?250 Yamaha ,05 KLR650 , '02 DR650 Suzuki, Honda XL600R
Location: Wisconsin, USA

Re: Xt600 carb runs oddly

Post by xtrider » Thu Aug 10, 2017 6:28 pm

It's usually due to either an air leak between carb and motor or lean jetting at 1/8-1/4 throttle . Can also be because of too rich at idle so the idle screw is set too high so it run with the extra fuel , shows itself by being high only when the motor is hot.



.
'08 Husqvarna TE510 .. //..'05 Suzuki DRZ470 stroker bbore..//..'95 & '96 Kawasaki KLX650 ..//..'88 XT600 ..//.. '86XT600(body)3TB hi comp motor ..//.. '06 Suzuki LTR450 ..//
'09 525XC KTM .. //.. '85 XT600/660 (660 Raptor bottom)

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