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Well I don't know squat about this little tiddler, my nephew just got one and I gave him his first lessons today, he did great and had a good time.
I think we'll be keeping the exhaust stock, any input on fattening it up to where it should pilot/main/needle clip wise would be would be appreciated.
It does the usual lean stuff, takes 15 minutes to warm up before it wil idle right, etc. Thanks, Doug

[mustang]

Hi Doug
If it is a typical lean situation and you are keeping everything box stock I would simply start with a bigger main by one size increase over stock (this usually fixes cold start issues), move the needle by one clip and the rest is in the fuel screw / idle mixture screw .
Little motors don't usually need very big changes to get great results .

You CAN do it !

[[email protected]]

Thanks, that's the way I was leaning and I'll give it a go ! Doug

[cu879]

My son has a 1995 xr 80 and a friend has a 2006 crf80. They are the same bike. They both want to die if you crack the throttle. This is a common xr problem i'm told.

I increased the pilot jet from the stock 35, to a 38 with little or no improvement. I continued to play pilot jet sizes and found a 40 is the biggest you can go and still have it idle. I did learn if you big (65), the hesitation is gone, but it is way to rich to idle right.

I was wondering if you are seeing the same problem, and if so does anyone know how to fix it. I have done quite a bit of research and found many people who are complaining, but not one solution.

[spyke999]

What would be a good jet size for a 100? I'm looking for better performance and less bog.

Mike

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I wound up ,with Willcrf's help, a 105 main,38 pilot, 1.5 turms out on the fuel screw, and opened the airbox up on the top of it, stock needle clip position, and it runs just super. Doug

[WillCRF]

Doug,

Glad to hear the CRF100 woke up. I bet your nephew was excited. I would also suggest going with a more open air filter. Either the Uni-filter or K&N seem to be the only choice. Knowing from experience with my truck, the K&N is a pain to clean and re-charge. We went with the Uni-filter on both bikes. Hard to beat that No-Toil system for cleaning filters.

Will

[[email protected]]

Thank You Will and Mustang, it runs great.
Mustang sent me seettings for a 150 as well for yet ANOTHER new rider, and they were right on, just did 'em tonight Mustang,they worked great.
Got the Uni coming too Will !
Doug

[WillCRF]

Doug,

What is the recipe for the CRF150? I am in the process of upgrading both boys to the bigger bike this summer.

Will

[[email protected]]

Hey Will,
Mustang said 110/42/4th clip and 1 turn out,and it runs way better, no more 10 minute warm ups.
I took out the insert and opened the airbox a little, just like you suggested on the 100, and it runs super. Doug

[mustang]

2005 CRF 150 jetting cure for sea level
110 main jet
38 pilot jet
stock needle stock clip position
1 3/4 turns on fuel screw

everything else is stock , airbox and exhaust
purrs like a little kitten and starts a boatload easier too and yay it will idle all by itself right after starting .