Moderator Cynic Posted January 9, 2011 Moderator Posted January 9, 2011 I know its a slightly odd question and i think i've put it up before many moons ago but! Anybody out there know what causes a 2 stroke to 4stroke. Sounds stupid i know. My DT does it even after the rebuild. Runs smooth with big throttle but chugging in traffic and it starts to 4 stroke, its like a misfire but not. More every other ignition is a bit lacking and the engine gets a bit arsy. Like when they are full of smoke in the first 500yrds when they are cold. I know she started her life on the enduro circuit and i've been less than kind but i'm curious. I can wind the throttle fully open uphill into the wind from 20mph in top and she will pull cleanly right up to 60+mph. But chugging along at 0mph on snow I ended up riding MX style spinning her up. Lot of fun though esp riding round people stuck in all the traffic with a rooster tail of snow. Just wondering, thats all. Carb is as the book plus a notch on the needle for the pipe. No leaks, good plug, starts ok ignition spot on (checked too many times thanks to a bad plug).
Moderator drewpy Posted January 9, 2011 Moderator Posted January 9, 2011 its the plug fouling up. 2 strokes need a good thrashing (like BWJ!) I had a friend with a 2 stroke aprillia and that was 4 stoking, she was a learner and was riding too slow. the "italian servicing" soon sorted that out!
Moderator Cynic Posted January 9, 2011 Author Moderator Posted January 9, 2011 its the plug fouling up. 2 strokes need a good thrashing (like BWJ!) I had a friend with a 2 stroke aprillia and that was 4 stoking, she was a learner and was riding too slow. the "italian servicing" soon sorted that out! So its actually its running just about perfect for a 2 stroke, just a little too rich for town so when i spank the smarties off it on the country roads i have a bit of 'spare' to keep her just right fuel wise. I just wonderd what it was thats all, goes well enough. Lifts the front in the first 2 cogs, on throttle and in third with a tug on the bars. So i'm hardly unhappy with the performance. Just makes it a little loud trying to sneak away at 0415 in the morning. Y'know Brrr, Brrr nearly little more choke, Brrr GOOD MORNING BUGBROOKE Dat Dat Dat Dat Dat
Moderator drewpy Posted January 9, 2011 Moderator Posted January 9, 2011 Just remembered taking my practicle test on a '79 kh125, 4 stroked below 30mph and that was a pain. Luckily it was before the accompanied ride, so once out of eye sight, I gave it some welly. I'm sure the assessor knew, chug chug past him, then out of sight and a wail of revs (had a micron pipe fitted) and blue smoke only to come back roung 10 secs later chug chugging along had one of those wired disk brakes which were crap, good job the rear drum worked must find a pikky of that....
Moderator Airhead Posted January 9, 2011 Moderator Posted January 9, 2011 Its almost certainly the notch up on the needle, mine did that in this video was a notch up (wasnt revving cleanly), put it back to standard and it was much sweeter. Go up a jet size instead, mine has a 140 instead of 130 in it with needle as factory set.
blackhat250 Posted January 9, 2011 Posted January 9, 2011 Yeh paul" has that spluttery rich sound, & fk me" dry pavements & sun , i havnt seen the grass or road to house since mid november, still 6" packed snow here, another 3" this morning, Fkn depessin ,
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