Running into a problem with a 02 viper. Running a compression check on the cylinders gave me 120 on head #3, 30 on head #2 and 118 on head #1.
I dropped some 2-stroke oil down #2 and it made no difference then I remember hearing something about a decompression chamber or something. Is 30 or so lbs on cylinder #2 correct? As mentioned even with a teaspoon or more of oil and the compression didnt increase at all.
Now here is the story:
Bought this sled used couple months ago for my wife I have idled it and ran up a few times in the garage without issue. Today was (suppose to be) our first ride. Let it warm-up for a good 5 minutes this morning no problems, then took it for a very easy ride down a road near us and back let it idle again for another couple minutes without issue. Ran my mxz down the road and came back the viper had turned off. Had a somewhat tough time firing it up but did manage to get it to go and then died again. I checked the plugs, they were all good but #1 was a little wet but no biggy. Torched it dry, put it back in, adjusted the idle up a bit and finally managed to get it going again. It stayed running this time. I let my wife drive it slow down this road, she got to the end and it just died. I tried driving it back and it up and died again. No warning lights or anything like an engine overheat. The second time it died though I couldnt get it started again so I towed it home and garaged it and just now checked the compression. I was able to fire it up again since buts its running like crap and wont stay running without throttle - even then its straining.
I should mention that when i fire it up now its running real rough, almost like its maybe starving for fuel on one of the cylinders, i thought maybe i toasted the top-end on one of the cylinders and that would explain the 30lbs compression like stuck a ring or something but dropping oil in the head didnt budge the compression at all.
So first of all, I want to confirm the compression numbers are correct, if the 30 is not expected that likely explains the issue, if it is...does anyone have any ideas? Fuel pump maybe? Carb plugged up?
Thanks guys
I dropped some 2-stroke oil down #2 and it made no difference then I remember hearing something about a decompression chamber or something. Is 30 or so lbs on cylinder #2 correct? As mentioned even with a teaspoon or more of oil and the compression didnt increase at all.
Now here is the story:
Bought this sled used couple months ago for my wife I have idled it and ran up a few times in the garage without issue. Today was (suppose to be) our first ride. Let it warm-up for a good 5 minutes this morning no problems, then took it for a very easy ride down a road near us and back let it idle again for another couple minutes without issue. Ran my mxz down the road and came back the viper had turned off. Had a somewhat tough time firing it up but did manage to get it to go and then died again. I checked the plugs, they were all good but #1 was a little wet but no biggy. Torched it dry, put it back in, adjusted the idle up a bit and finally managed to get it going again. It stayed running this time. I let my wife drive it slow down this road, she got to the end and it just died. I tried driving it back and it up and died again. No warning lights or anything like an engine overheat. The second time it died though I couldnt get it started again so I towed it home and garaged it and just now checked the compression. I was able to fire it up again since buts its running like crap and wont stay running without throttle - even then its straining.
I should mention that when i fire it up now its running real rough, almost like its maybe starving for fuel on one of the cylinders, i thought maybe i toasted the top-end on one of the cylinders and that would explain the 30lbs compression like stuck a ring or something but dropping oil in the head didnt budge the compression at all.
So first of all, I want to confirm the compression numbers are correct, if the 30 is not expected that likely explains the issue, if it is...does anyone have any ideas? Fuel pump maybe? Carb plugged up?
Thanks guys
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Answered my own question. Dropped more oil in the cylinder to ensure there was a good seal and sure enough the compression jumped upto 118/119.
NOW my question, any idea on why #2 cylinder would take a shit but the others seem okay? What is the stock compression on these engines? I am really hoping I can get away with replacing just the piston/rings (I havent tore it down yet but Im guessing with that low of compression the ring has melted into the piston groove.) on this one cylinder and leave the others.
Please advice, I want to get these parts ordered asap.
PS.
Do these heads and cylinders use o-rings or gasket? I am going to order to the piston/ring kit and head and base, intake and exhaust gaskets all in one shot if i need them.
Thanks again guys
NOW my question, any idea on why #2 cylinder would take a shit but the others seem okay? What is the stock compression on these engines? I am really hoping I can get away with replacing just the piston/rings (I havent tore it down yet but Im guessing with that low of compression the ring has melted into the piston groove.) on this one cylinder and leave the others.
Please advice, I want to get these parts ordered asap.
PS.
Do these heads and cylinders use o-rings or gasket? I am going to order to the piston/ring kit and head and base, intake and exhaust gaskets all in one shot if i need them.
Thanks again guys