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Old 05-21-2011, 03:47 AM   #1
matt36567
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Default 90 model kf82 no power

I replaced the connecting rod becuase it was knocking. now it does not have the power it had before. read thru all the articals here and have found no answers. as far as I can tell all the timing marks are lined up. I lapped the valves. it does seem to blow out the intake just a split second before the intake stroke starts. can anyone help me on this one?
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Old 05-22-2011, 11:25 AM   #2
shadowman
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Default Re: 90 model kf82 no power

welcome, was it running ok before you worked on it? ..................
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Old 05-22-2011, 08:04 PM   #3
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Default Re: 90 model kf82 no power

better than it does now. he used to up a steep hill now it boggs down on a slight incline.
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Old 05-22-2011, 08:14 PM   #4
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Default Re: 90 model kf82 no power

are you sure timing marks are lined up proper on crank and cam? carb is all there? how about the brass screw type jet right on top of carb....make sure it didn,t come out i have seen that happen a few times...............
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Old 05-23-2011, 07:07 PM   #5
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Default Re: 90 model kf82 no power

carb is all there along with the brass screw. was gonna rebuild the carb later once i get this thing running again. I think I have the timing on. I know when I spin it by hand I get a little pressure out the intake before it starts pulling in. do you happen to have a pic of the timing marks?
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Old 05-23-2011, 09:21 PM   #6
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Default Re: 90 model kf82 no power

Quote:
Originally Posted by matt36567 View Post
carb is all there along with the brass screw. was gonna rebuild the carb later once i get this thing running again. I think I have the timing on. I know when I spin it by hand I get a little pressure out the intake before it starts pulling in. do you happen to have a pic of the timing marks?
Compression coming through the intake doesn't sound right at all, It sounds as though the valve is opening on the piston up-stroke and not just after TDC as it should. Definately sounds like the timing is off.

Chris.
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Old 05-23-2011, 10:43 PM   #7
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Default Re: 90 model kf82 no power

does anyone have a pic or drawing of the timing marks on the KF82? the only ones I seen on here are of a different engine Im guessing one of the FE's becuase the cyclinder is slanted.
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Old 05-24-2011, 08:27 AM   #8
shadowman
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Default Re: 90 model kf82 no power

sorry i do but i don,t have it here its at camp and oonest i can get it posted would be monday.............i know there are marks on each one that have to face each other.........i think your timing is off........................
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Old 05-24-2011, 10:48 AM   #9
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Default Re: 90 model kf82 no power

thanks, fixin to pull the motor again. this time I will take pics!
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Old 05-24-2011, 04:52 PM   #10
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Default Re: 90 model kf82 no power

got it pulled apart again. all the timing marks line up. i noticed the intake valve starts to open just before the exhaust closes. piston is just before TDC. mic'd the tappets and they are the same length. then noticed the cam gear was loose on the cam. rivets are starting to wear around the metal. can these betightened or do I need to replace it?
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