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xt 600 carb. jetting
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Posted by: ugd420---------------------
I am rebuilding a xt 600 I installed a 1mm over piston 9.5 to 1 comp.and a web camshaft for improved mid - top end power.Lift .385 IN & .375 EX set at 107.5 lobe centers IN. & 112.5 LC. EX The dual carb on this bike is the problem I made some shims for the needle. I need main jets .
Posted by: matt-itude---------------------
What year xt? I told one guy in here that on my 83 (which had a dual carb) I had to make my own main jets. I had to take the regular old mikuni main jets (same thread) chuck them in a drill. Took a small file and turned them down. Then used a die to extend the threads further down the jet and cut them to length. So when i got done the hex or nut part that you put a socket on was only about a third the length it began at and the overall length about half what it began at (just sized the jets I was making next to the original out of the carb). and the part filed away was now threads. I had to compare the size of hole in the jet, because the number didn't seem to mean anything, and built several so I could dial it in. On mine the secondary side had a hose from the float bowl to a nipple that doubled as the jet. (mine ran too rich) so I just took a piece of regular clear fuel line and pushed the size of jet i wanted to reduce it to inside the hose and installed it. I built several sizes of those also. Nobody I found could get me jets to fit that style carb. When I was done it ran really well. I noticed some of the newer bikes didn't have the hose between the two sides so on those you might have to build jets for the other side also.
Posted by: ugd420---------------------
The bike is an 88 xt600 83-89 carb is the same as your 83,I am building this engine for a friend (customer). The bike was running when i tore it down.The carb was rich at 3/4 to full throttle. I am hoping the new cam & piston will suck up that extra fuel. I always Expect the worst & hope for the best. You certainly have the right matt-itude. Thanks! I owe you one
Posted by: matt-itude---------------------
If it gets really ugly I might still have a couple of the ones I made lying around. I could possibly mail you one to look at if my description is too hard to follow. I hope it is all clear in your head as to what Im talking about. If you have more questions please ask. I don't think many people would take the time to dial these carbs in because it takes a little effort (build your own parts out of the closest thing you can find) and understanding. I've said it before that bike really ran good when I got it right.
Posted by: matt-itude---------------------
Another thought we took the spark arrestor out of the back and used along 5/8 drill bit to knock 5 holes in the baffle inside the pipe giving the exhaust a straighter shot out. It made it louder though. I couldn't find a pipe for it or I didn't want to spend the money on it at the time, I don't remember which.
Posted by: thumpertt600---------------------
lets put some pics up of are bikes http://i2.photobucket.com/albums/y2.../Picture002.jpg
Posted by: ugd420---------------------
I Had to read through your directions, A few times to figure it out. I apreciate your help I have been stressing over this.When my buddy first asked me about rebuilding his engine.I remember bragging about being able to rejet it.You can imagine how ignorant I felt, When I found out about the jets.I owe you one. If your ever in need of parts. Let me know I might be able to save you some money Do you remember the diam. & thread pitch of the die you used.
Posted by: matt-itude---------------------
It has been too long but it seems that they were the same thread as the standard mikuni jets. I would screw one into the carb to double check me. I just remember toting the jet around looking for that small of a die. You may be able to find the size also by trying the bolt bin out at a hardware store to find a corresponding nut (to give you the diameter and pitch). Wish I could help more. good luck on this thing. I will look for one and take it to work with me tomorrow see if I can find out.
Posted by: thumpertt600---------------------
ok guys , i went i got a XT550 CARB and bolted it right on and ran perfect , so you mite wanna check that out
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