Maintenance & Technical > KX450F / KX250F

06' 450F Hard to Start

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FPMXer:
I would think they both should have been either 220 or 230. I will have to look at the stockers I took out. I got a hot cams shim kit off e-bay and use it. I have only had to shim it once so far. But I have since parked it after spec'ing everything out while I await it's sale. I will look at the shims I took out and see if they are different.

Scott Marks:
That would be great!  I have a few smaller size shims on their way from the Kawi dealership.  Any idea why the intakes are tight and the exhaust are fine?  Is it common for the intakes to tighten up more than the exhaust after you re-work the valves? This is what happens when you buy 2nd hand, you often have to start from scratch. 

FPMXer:
I just checked the stockers and they both start and end with 5 the middle number is worn off. I shimmed them both the same and haven't had to reshim them yet. The right intake runs cooler than the rest because the intake charge is blasted on that valve as it exit's the carb. If they get any worse then a valve seat cut is in order.

don46:
I've had different shims from the factory, no worries, your only talking thousanths, and no manuf. process is that close. as far as your clearances, I think one of you is talking thousands and one mm.

Scott Marks:
You are correct, we have mentioned both mm's & thousanths. The service manual lists both clearances as well. I was able to gain the past history on the bike and that helps a bunch. Chad Watts (Watts perfections) rebuilt the entire motor about 10 months ago. They broke a radiator and cooked it. He had all the info on his computer and provided me with the shim #'s for all (4) valves upon the competion of the engine rebuild. The guy I bought it from tore it down, put in a new piston, rings and had the head re-worked again. Now I am able to compare the shims from job #1 to job #2. (2) are .002, (1) is .004, & (1) is .006 different.  Easily changed by doing a valve job.  Sorry for being so long winded, I am trying to trust the work that has been done. I know I should go ahead and pull the head off and see for myself.  I feel like the valves seated in and tighted up after job #2 and that is why they are tight now. I am going to get the clearances correct and see if I can kick start it. Ride it a few hours and check them again. If they change again, then I will pull the head off. This bike also has the wrong spark plug in it. The correct plug has the electrode and ground protruding past the treads. If the spark is being delivered up in the treads, I can't think this will help in kick starting.

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