Hi there

Been taking apart my 08 rev 4 carb. It's clearly never been touched and the bike hasn't had a great deal of use. But every screw on the carb is seized / over tightened by the factory. I had to use all the tricks in the book to get the screws out of the float bowl and diaphragm top. I'm not being a retard, these screws were jammed solid and had clearly been over tightened by whoever had assembled the carb. I have replaced these and greased the threads with nice stainless allen bolts so hopefully problem solved. But the airscrew just disolved when I put the screw driver on it. The screwdriver fitted perfectly. It too is jammed / seized in it's thread. I took the carb to a motorcycle engineer (I'm very lucky as he has a workshop a few streets away) and he said he had tried everything bar drilling and couldnt get it out. he didn't want to drill it and use a bolt extractor as I had said at least it is siezed in it's right spot and drilling it and getting it wrong could end up with me buying a new carb body. I'm gutted as I was going to fit one of those nify jitsie air screws. Has anybody else had difficulty with this carb ? I have to reluctantly accept it as jammed or risk drilling and ruining carb body which I can't afford to do.

Hi there

Been taking apart my 08 rev 4 carb. It's clearly never been touched and the bike hasn't had a great deal of use. But every screw on the carb is seized / over tightened by the factory. I had to use all the tricks in the book to get the screws out of the float bowl and diaphragm top. I'm not being a retard, these screws were jammed solid and had clearly been over tightened by whoever had assembled the carb. I have replaced these and greased the threads with nice stainless allen bolts so hopefully problem solved. But the airscrew just disolved when I put the screw driver on it. The screwdriver fitted perfectly. It too is jammed / seized in it's thread. I took the carb to a motorcycle engineer (I'm very lucky as he has a workshop a few streets away) and he said he had tried everything bar drilling and couldnt get it out. he didn't want to drill it and use a bolt extractor as I had said at least it is siezed in it's right spot and drilling it and getting it wrong could end up with me buying a new carb body. I'm gutted as I was going to fit one of those nify jitsie air screws. Has anybody else had difficulty with this carb ? I have to reluctantly accept it as jammed or risk drilling and ruining carb body which I can't afford to do.

I have one of the stock screws on the bench if you would like a photo of what a stock screw looks like to help in knowing if you want to drill it out or leave it, send me a PM with your email address and I'll send you a photo in a day or two.

I have one of the stock screws on the bench if you would like a photo of what a stock screw looks like to help in knowing if you want to drill it out or leave it, send me a PM with your email address and I'll send you a photo in a day or two.

Thanks for the help but Im in the United Kingdom

Thanks for the help but Im in the United Kingdom

huh?

re-read his post

I have one of the stock screws on the bench if you would like a photo of what a stock screw looks like to help in knowing if you want to drill it out or leave it, send me a PM with your email address and I'll send you a photo in a day or two.

Hi there

May have misread your post a bit. I thought you were offering to drill it. Apologies, it was very early in the morning. It's ok, I know what the stock air screw looks like. I just don't think it's worth the risk of drilling it unless I can be 100% sure I won't damage the thread. The carb is very expensive on the 4t as you know. The engineer who had a look at it for me is very gifted with how he machines things and even he gave odds of only 50/50 of getting it out undamaged. It just isn't worth the risk as I can't afford a new carb and the bike runs sweetly in the position it is in. I'm not planning on riding anywhere low, high altitude so i think I will just have to put up with it. Thanks anyway. Gareth