Edited by mlynn450, July 10, 2010 - 07:29 AM.
did 06 yz 450 cam swap in 07 wr450. Jetting question
Posted July 10, 2010 - 07:01 AM
Posted July 12, 2010 - 08:54 PM
Posted July 13, 2010 - 05:39 PM
I ride between 500 and 4000ft elevation generally.
Posted July 13, 2010 - 06:06 PM
Posted July 13, 2010 - 06:29 PM
I'm not sure about the number of links, but All the timing marks are lined up spot on. I read somewhere on here to set all the marks according to stock settings in the manual. Anyone know if this is correct?
Go by the timing marks, if they all line up you're good on the timing.
Like I said I would try leaning out your jetting a bit. I get more popping on decel with a rich pilot then lean with the ACV in this carb. I also run a 168 main, GYTR needle 3rd clip from the top.
Posted July 13, 2010 - 06:49 PM
Posted July 13, 2010 - 07:58 PM
I have a 45 pilot and a 168 main. I'll give that a try and drop the needle one notch. I have the ACV disabled in the closed position. I really enjoy working on these carbs:foul:
ACV? Racking my brain.
Posted July 13, 2010 - 08:29 PM
Posted July 17, 2010 - 06:07 AM
Posted July 17, 2010 - 07:07 AM
I just got things tore apart again and there are 13 pins between the marks and the timing marks are lined up spot on. Is 13 pins correct? I'm also leaning out the jetting as per Tribalc. I'll let you know how it works . Thanks everyone.
The WR timing is 14 pins and YZ with both cams is 13 pins. I believe the only difference in timing is with the exhaust cam so 13 pins should be right.
That said pins are just a reference and shouldn't be used to time. It's all about the dots lining up as chains can be stretched, etc. If all your dots are in the 9, 3 and 12 oclock positions when at TDC you are timed correctly, which you indicated they are earlier.
Let us know how it works with the leaner jetting, you may have to play around a bit. If you pull the boot on the carb on the intake side and remove the hot start, then loosen the other boot you can rotate the carb enough to get at the pilot and main. Needle you can get at if you remove the motor mounts.
Posted July 17, 2010 - 09:11 AM
Posted July 17, 2010 - 04:49 PM
W.T.F. is the ACV???
Air cut off valve. Richens the circuit on decel to prevent popping.
Posted July 18, 2010 - 07:08 AM
Edited by mlynn450, July 18, 2010 - 07:39 AM.
Posted July 18, 2010 - 10:06 AM
Where is this ACV located?
Thanks much, John
Posted July 18, 2010 - 11:04 AM