Post by scootjockey on Sept 6, 2022 22:05:59 GMT 1
Finally got around to taking me sons 2002 DT125R out for a shake down run before im happy to let him out on it after the winter strip n rebuild.
Cold on tick over its putting out a lot of smoke which i kinda expected as the engine has had a full strip and rebuild including new top end rebore piston, rings, conrod big ends etc. But after 5-6 miles and up to temperature its still smoking like vape addict on steroids.
When i got it back the rear end of the bike was covered in loads of black unburnt oil and it was still smoking just as bad on tick over. The bike had a Gianelli full system on before strip down and this has been replaced with a full DEP system. The old exhaust was full of oil when i left it standing and made a nice mess as it leaked out on the garage floor over the past few months.
I fitted a new throttle cable as part of the restore and noticed a fair bit of slack on the cable where it connects onto the oil pump and if i did'nt know better would say the oil pump return spring is worn as it does'nt snap back to fully closed. The cable has been set up as per the Haynes book.
As its still being run in i tried not to take it past 5k but the hooligan in me let it run up to 7k in 4th & 5th where it should be in the power but it just splutters like a good un. The engine pulls really strong from low revs and i was quite surprised how smooth it is
Things i have'nt done yet is strip/check the carb as it seamed to be running ok before strip down. And the bike fired up no problem when rebuilt.
I dont know if the main jet (240 std ) has been changed to allow for the exhaust. And a check of the new plug only indicates that its oily very oily and it does'nt have enough miles on it to show a true refection of what shade it should be.
Before i check the carb does anyone have any ideas ?
Can the oil pump be putting out too much oil even on tick over ? Can you get an oil pump repair kit for these ? And if main jet is wrong ( Possibly standard and too small ) will replacing this and or raising the needle 1 notch help burn more fuel to help burn the oil ?
The bike is running standard airbox and plug is BR9ES
Cheers Gaz
Cold on tick over its putting out a lot of smoke which i kinda expected as the engine has had a full strip and rebuild including new top end rebore piston, rings, conrod big ends etc. But after 5-6 miles and up to temperature its still smoking like vape addict on steroids.
When i got it back the rear end of the bike was covered in loads of black unburnt oil and it was still smoking just as bad on tick over. The bike had a Gianelli full system on before strip down and this has been replaced with a full DEP system. The old exhaust was full of oil when i left it standing and made a nice mess as it leaked out on the garage floor over the past few months.
I fitted a new throttle cable as part of the restore and noticed a fair bit of slack on the cable where it connects onto the oil pump and if i did'nt know better would say the oil pump return spring is worn as it does'nt snap back to fully closed. The cable has been set up as per the Haynes book.
As its still being run in i tried not to take it past 5k but the hooligan in me let it run up to 7k in 4th & 5th where it should be in the power but it just splutters like a good un. The engine pulls really strong from low revs and i was quite surprised how smooth it is
Things i have'nt done yet is strip/check the carb as it seamed to be running ok before strip down. And the bike fired up no problem when rebuilt.
I dont know if the main jet (240 std ) has been changed to allow for the exhaust. And a check of the new plug only indicates that its oily very oily and it does'nt have enough miles on it to show a true refection of what shade it should be.
Before i check the carb does anyone have any ideas ?
Can the oil pump be putting out too much oil even on tick over ? Can you get an oil pump repair kit for these ? And if main jet is wrong ( Possibly standard and too small ) will replacing this and or raising the needle 1 notch help burn more fuel to help burn the oil ?
The bike is running standard airbox and plug is BR9ES
Cheers Gaz
