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Old 10-17-2011, 11:17 PM   #1
Japawhat02
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xr250r top end

having a compression issue, so i pulled the motor, broke everything down, and.....
xr250r top end

xr250r top end

xr250r top end

Im no mechanic, but everything looks ok to me. No scoring on the walls or cracks that i can see. Maybe valves?

Chad?

Just some background. Bike has been sitting for an undetermined amount of time. Bike kicks way too easy. Carb has been completely rebuilt, new plug, clean gas, no start.
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Old 10-17-2011, 11:39 PM   #2
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Sounds like maybe the gear for the kick start is destroyed.
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Old 10-17-2011, 11:54 PM   #3
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Its not that easy, there is some resistance. I Have evrything torn down at the moment, and the insides are very clean. No broken teeth or any signs of wear at all. From the inside it looks like a brand new machine.
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Old 10-17-2011, 11:55 PM   #4
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Lol. Whaddup. Shoot me a text or call me. I know that bike like the back of my hand. I have an 03 that is a 277 now and has a hot cam. Also put crf450 forks on it. What year is it? The cylinder looks 96-04. Looks like mine from what I remember. Also explain a little more. Lol. Whas the bike turning over?
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Old 10-18-2011, 12:06 AM   #5
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Its a 2002, and yes it was turning over. We got it out of a friends grandparents garage. Dont know exactly how long it had been sitting, but it was atleast 2 years. Rebuilt the carb and changed all the fluids, but couldnt get it to run. What else you need to know.
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Old 10-18-2011, 12:08 AM   #6
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Quote:
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Its a 2002, and yes it was turning over. We got it out of a friends grandparents garage. Dont know exactly how long it had been sitting, but it was atleast 2 years. Rebuilt the carb and changed all the fluids, but couldnt get it to run. What else you need to know.
too bad you tore it down. Could have done a leak down test. Next thing is rebuild it. New piston. Possibly bore it over. Did it have spark?
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Old 10-18-2011, 12:18 AM   #7
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Yeah it had spark. It seemed to me that it just kicked too easy, i have very little experience, with anything kick start though.
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Old 10-18-2011, 10:30 AM   #8
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Got a picture of the valves?
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Old 10-18-2011, 11:21 AM   #9
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slow down tiger! start with the easy stuff first! lol
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Old 10-18-2011, 11:22 AM   #10
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I would have started with adjusting the valves....too late for that now. lol probably not a bad idea to replace all those gaskets anyhow.
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Old 10-18-2011, 11:31 AM   #11
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Maybe the rings were sticking?? +1 on checking valve clearance and timing.

Put a new set of rings/gaskets, throw it back together. Check the valves. Do a compression test/leak down. Then decide what to do.
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Old 10-18-2011, 11:33 AM   #12
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Someone is a little wrench happy lol. It doesn't run so let tear it down! haha. And what Danny said. There is so much other stuff to check before you did what you did lol.
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Old 10-18-2011, 11:34 AM   #13
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Quote:
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Maybe the rings were sticking?? +1 on checking valve clearance and timing.

Put a new set of rings/gaskets, throw it back together. Check the valves. Do a compression test/leak down. Then decide what to do.
He has the head off, he might as well inspect the valves now. Push on them and see if they open close and seat right.
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Old 10-18-2011, 11:38 AM   #14
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dump some wd40 into the ports, place the head on a paper towel, and see if the valves leak. any leak would indicate a loss of compression.

Last edited by hotnanas; 10-18-2011 at 11:41 AM.
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Old 10-18-2011, 11:40 AM   #15
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dump some wd40 into the ports, place the head on a paper towel, and see if the valves leak.
Exactly what I was about to tell him lol. Plus if you arent going to get another piston at least get new rings before you put it back together.
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Old 10-18-2011, 11:47 AM   #16
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by the way, I hope it wasn't one of those "kicking technique" problems...If I am thinking of the right bike, I couldn't start the XR because it was funky feeling! that kickstart felt like it was 6" too long and my knee was higher than my armpit to get a full stroke.

but when my 4 strokes won't run right, i always start with the carb, valve clearances, timing, cam timing, and spark plug. all of those are pretty quick checks from TDC.
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Old 10-18-2011, 12:18 PM   #17
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yeah i know i jumped the gun a little, but i planned on replacing atleast the rings any ways. Thanks for the tip for the valves, ill try that when i get home. Im going to have chad look at the cylinder and piston just to be safe.
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Old 10-26-2011, 07:51 PM   #18
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The compression relief on those can stick open...which will drop compression pretty close to zero...look at the cable and lever on the right top side of the valve cover.
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Old 10-26-2011, 07:53 PM   #19
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The compression relief on those can stick open...which will drop compression pretty close to zero...look at the cable and lever on the right top side of the valve cover.
Yup and it has a weird auto decomp.
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Old 10-26-2011, 08:31 PM   #20
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If a bike has been sitting for a couple years dump oil down the spark plug hole. It will trick the motor into having compression and if something was ceased it would break loose after starting. Only dump a CAP full. Next time to a leak down test before you go ripping a motor apart lol
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