JimDettman, on 19 June 2012 - 04:54 AM, said:

I dont know how long he is testing either.  I have seen the valves close up again after a reshim within 1 hour or ride time.  The valve stems do not stretch so much as the titanium coating on the valve face wears off.  When this wears off and the valve face wears, the valve sits deeper in the head causing the valve tip to sit higher in relation to the cam.  The reasons have been discussed at length on this forum and others.  The general consensus is that dirt and dust makes it past the air filter and that wears the titanium coating off the valve face.  Once the coating is worn off, the valve face wears extremely fast. That is why once the valve clearance closes up once, it continues to close up again and again after re shimming.

All that being said, I agree completely with you on checking the other things that could cause an idle problem.  I only brought up the recheck of the valves to prevent him from overlooking something that may have changed quicker than he would have though.

If his valves are still in spec, I would be checking the pilot circuit.

Another potential issue is that the bike is running like it was when he bought it now that the valve have been re shimmed and he is hyper sensitive to how it is running now.  I have been an auto mechanic for 20 years and I can tell you many stories where a customer claims there car or truck is now making a noise after we worked on it that it "never made before" .   A noise that is completely normal for that type of motor and I can take them out to the new car lot and show them that every one of those trucks make the same noise.  Or a guy who said his air conditioning didnt work after we did a tune up and the car was never equipped with air conditioning. Another guy said he had a 6 speed manual transmission when his truck came with a  5 speed and he accused us of steeling one of his gears.  I guess what I am getting at is the op bought a used bike that has valve issue.  He may be seeing problems that were there already.

I dont mean any disrespect to the OP. Just human nature sometimes.  I would recommend jetting it and see what it does while keeping an eye on the valve clearance.

I recommend a 150 main, 42 or 45 pilot and 55 leak.  My California model came with a 65 leak but I think the other state models came with a 55.  If you have to have the mixture screw out more than 2 turns with the 42 then switch it to a 45 and you should be about a turn and a half out or so.  good luck.

no disrespect taken Condor.
I am trying to get my sons bike running, it sucks to have a toy and can't play with it.
The bike never ran well even after we first bought it, thats why I have no idea what has been done to it.

I pulled the pilot jet but there are no markings so I have no idea what size it is.
I also pulled the mix valve to clean it, and inside;also wanted to check the tip to see if it may be broken.
all looks good to me.

I adjusted mix screw to 1-3/4 and it will idle but very low, I will test ride tomorrow to get it good and warm and
see where I am.
So far I have only run it until I get the cherry red pipe then I shut it down.
Thanks for the help
Dennis

A new 42 or 45 pilot should fix it. I ride with a buddy that has a 250x(aftermarket exhaust). I jetted it, and the 45 pilot was the ticket.

if you get it running smooth you can juts adjust the idle with the idle speed screw.  Once you get all the bugs worked out, you and your son will have a great time.

Waiting on parts.
Ordered 42 P jet and air mix screw.   purchased 45 P jet and 150 main from local shop, but they didn't have the 42.

while I was putting valve cover on today I noticed 2 bleeder lines that were disconnected.
1 was small about 7" long and the drain end went under the rubber flap where the rear of the seat would be and ended right there.
the other was bigger had a 90 deg bend on the top end and went behind the motor and came out below the frame with 3 other lines.
Is there a layout somewhere of where all the vac lines connect?
the drawings on the carb diagram sheet show what looks like the big one but not sure.
I looked all over the carb and everything else I could see but nothing appeared to be missing.
Thanks for the help

Dennis

lawnman127, on 26 June 2012 - 03:13 PM, said:

That should do - I have a 45 pilot in my '06 and a either a 155 or 158 (can't remember) main w/ opened airbox and no other mods.  My needle is 2nd clip from the bottom (wants to be at 2 1/2 - someday I'll make a 1/2 position shim).

JayC

jayc250x, on 28 June 2012 - 09:11 AM, said:

Stick a washer under the clip. I think it is a #4 or #6 washer.

papawhiskey1, on 28 June 2012 - 07:48 PM, said:

I should re-phrase..."someday I'll get motivated enough to take my carburetor off again".