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Old 01-20-2013, 02:44 PM   #1
thebujster
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Rough acceleration down low XR100, what's the problem?

So I've been trying to fine tune an XR100, and I have it running but it is very very poor in low-middle RPM situations. In 1st-3rd gear when I give it gas, it sputters and is very very jerky while riding. Almost stop and go, as in gas is being cut in/out. If I get it to 4th and 5th gear, it is not so bad? If I am on full throttle the response is less jerky as well.

What might be the problem? Is it 99% carb related issue with a slow idle jet being clogged? Could it be something else? I've taken the carbs apart and cleaned them. Didn't see that many if any cloggage. Should I adjust the air-fuel mix screw or the idle screw? If so, should I turn them in or out?

Any help is appreciated. Thanks!
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Old 01-20-2013, 02:55 PM   #2
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Bad gas maybe or jetting. Go to your manual and set your carb to stock settings, fresh gas and then go from there.
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Old 01-20-2013, 02:58 PM   #3
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I've already tested fresh gas. When you say jetting what does that mean? The needle sizes are wrong?
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Old 01-20-2013, 04:24 PM   #4
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Don't quote me, but less than 1/4 throttle is pilot, 1/4 to 3/4 is needle and 3/4 to full is main jet.

I am guessing you pilot is plugged, especially if bike sat for any period of time.
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Old 01-20-2013, 05:27 PM   #5
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It could be. Do you have the manual. you can download the pdf for around $6. Ill try and find the website. The manual tells you how what needle size for the jet and how to zero the carb. That ahould get you close so you can tweak from there. clean all the jets too. You can pm tflstb he has one thst he does alot of work too.
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Old 01-20-2013, 06:14 PM   #6
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Quote:
Originally Posted by Jason_Canuck View Post
Don't quote me, but less than 1/4 throttle is pilot, 1/4 to 3/4 is needle and 3/4 to full is main jet.

I am guessing you pilot is plugged, especially if bike sat for any period of time.
Thats what I saw online as well. I checked all my jets they are clean and unclogged. I was guessing it was the needle. I ended up taking apart the needle, then put it back together. Now the throttle tube only turns 1/8 before it locks out?

I think I might just bring it to a shop. I'm tired of wasting my time lol
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Old 01-20-2013, 06:42 PM   #7
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is it the stock carb?
is the motor stock?
have you done anything to the air filter? is the air filter a stock one?
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Old 01-20-2013, 07:27 PM   #8
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where are u located, maybe me of someone close by can swing by and give ya a hand

need to take the carb completely apart (jets, gaskets..everything) and soak it in 50/50 pinesole & hot water, that will clean the outta the carb! All it takes is one super tiny piece of debris to make it run like

Im with Jason on the below

Quote:
Originally Posted by Jason_Canuck View Post
Don't quote me, but less than 1/4 throttle is pilot, 1/4 to 3/4 is needle and 3/4 to full is main jet.

I am guessing you pilot is plugged, especially if bike sat for any period of time.
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go ahead and cry so I can use the tears as lubrication to stick it in you
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Old 01-20-2013, 08:52 PM   #9
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What's all this I'm hearing about using pine sol to clean carbs? Also check the plug it can give you a lot of details about how the burn is happening and where to adjust. Google it there are tons of reads about tuning off a hot plug.
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Old 01-20-2013, 09:29 PM   #10
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What's all this I'm hearing about using pine sol to clean carbs? Also check the plug it can give you a lot of details about how the burn is happening and where to adjust. Google it there are tons of reads about tuning off a hot plug.
try it an you will understand

http://www.motohouston.com/forums/sh...highlight=pine
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Old 01-21-2013, 08:41 AM   #11
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If your throttle only turns 1/8 of a turn now you didn't get the needle and slide down in there right. There's a cutout on the slide and a tab in the carb body that have to match up for it to drop in.

The stock pilot jet is a 38. The stock main jet is a 95.

If everything is stock I'd say clean it again and blow air through all the ports in the carb body. Even a tiny piece of gunk in that pilot circuit will screw it up.
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Old 01-21-2013, 08:55 AM   #12
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yep, if all is stock on the bike, you should not need to make any changes...
they can look clean and still need cleaning...been there, done that.
luckily the carb is small and easy to get to, it only takes a few minutes to pull it and put it back on...
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