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Old 10-19-2008, 06:07 PM   #1
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Im working on a 03' Prairie 650, there was a few people that worked on it before me and they had the timing set wrong. Im comfused about what marks on the flywheel need to be in sync with what marks on the cam gear. I've tried it many different way's and the valves eather hit, or it does nothing. Ive heard that you also need to set the rear cylinder first, and set the front at 270, so how do i tell i went 270. Any direction in this matter would be really helpfull since im kinda under the gun, and dont have time for a manual to get here, Thanks in advance!
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Old 10-20-2008, 01:07 AM   #2
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If you look under the TECH TIPS section on Nyroc's website, you will find a very good article written by DWB on how he installed cams on his P700. clicky

In a nutshell, turn one cylinder to TDC and install the cam making sure the arrow on the cam sprocket is pointing straight up...after you finish installing that cam/head, then you turn the motor 270 degrees to reach TDC of the other cylinder and then install that cam. Make sure you put the REAR cam in the REAR head!!! The rear cam should have a groove on it...see the article for more info.

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Old 10-20-2008, 07:22 AM   #3
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Here's the Fool Proof way to find 270.

270* = 3/4 of THE ENGINE'S ROTATION.

So if the rear cyl at TDC is 12:00 position. turn the crank CLOCKWISE 3/4 of a turn until it gets to the 9:00 position.

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Old 10-20-2008, 06:14 PM   #4
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Thanks for all the help! I Believe i followed everything in the directions you provided(from the link, and the 2nd post.) it still seems to be timed wrong, my front cylinder is actually blowing back out through the intake. Is there a chance i might have something reversed? Thanks again for all the help, Adam
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Old 10-20-2008, 06:18 PM   #5
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Quote:
Thanks for all the help! I Believe i followed everything in the directions you provided(from the link, and the 2nd post.) it still seems to be timed wrong, my front cylinder is actually blowing back out through the intake. Is there a chance i might have something reversed? Thanks again for all the help, Adam
[/b]

did you turn the crank CLOCKWISE after setting the rear cam first? very important.. also did you set your valve lash?
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Old 10-20-2008, 06:30 PM   #6
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Also, did you make sure to install the REAR cams in the rear head?
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Old 10-21-2008, 01:05 AM   #7
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Make sure you have the correct cam in the rear head, like they said. The rear cam has a small groove in the ring thingy, the front doesn't, just compare the two.

The easiest way is to set the flywheel on the TR mark and install the rear cam with the arrow on the cam sprocket facing up and the two small hash marks that are on the sprocket also, parallel to the head. Make sure the cam tensioners are removed. After the rear is installed, turn the crank with a 19mm wrench clockwise to the TF mark, which is 270*, then install the front cam just like the rear.

It sounds like you have the cams reversed, I done it and it did just what you described, would fire but not run and blow through the carb

If these are new cams and you've had everything cleaned good, use some engine/cam lube while assembling it
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Quote: Originally Posted by Dynoray View Post

It says race because it was 12.6:1, instead of 11:1
lol, so going from 11:1 to 12.6:1 is building a race motor to you
LOL, back in 04-05, pretty much, LOL
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Old 10-21-2008, 02:37 AM   #8
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Quote:
Make sure you have the correct cam in the rear head, like they said. The rear cam has a small groove in the ring thingy, the front doesn't, just compare the two.

The easiest way is to set the flywheel on the TR mark and install the rear cam with the arrow on the cam sprocket facing up and the two small hash marks that are on the sprocket also, parallel to the head. Make sure the cam tensioners are removed. After the rear is installed, turn the crank with a 19mm wrench clockwise to the TF mark, which is 270*, then install the front cam just like the rear.

It sounds like you have the cams reversed, I done it and it did just what you described, would fire but not run and blow through the carb

If these are new cams and you've had everything cleaned good, use some engine/cam lube while assembling it
[/b]
Valve lash?
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Old 10-21-2008, 08:57 PM   #9
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you looking for the valve lash specs? stock or aftermarket cams? Stock I don't even remember, aftermarket cams, depends on who's cam you're running
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Quote: Originally Posted by Dynoray View Post
Quote: Originally Posted by hndlbarmonkey View Post
Quote: Originally Posted by Dynoray View Post

It says race because it was 12.6:1, instead of 11:1
lol, so going from 11:1 to 12.6:1 is building a race motor to you
LOL, back in 04-05, pretty much, LOL
AMR 840 trail bike
Fundy 800 race motored trail bike<wifes

Fundy 800 drag bike


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Old 10-22-2008, 05:14 PM   #10
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They are stock cams. The Cam with the groove is on the rear cylinder. Also, for some reason i have barely any compression now, and when i started it was fine. Is there some sort of compression release i sould know about? Never heard of one, and dont see were one could be. This thing is really throwing me for a loop. Thanks for all the help so far guys! Thanks in advance, Adam
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