Think my bije could do with a ring change as there only seems to be one ring on the piston i see piston kits on ebay ? non genuine will they wear quicker do they still wear the same ?
people used to only put one ring on as some sort of effort to make the bike quiker as it changes the timmings of the ports
on a bike like ours its just not needed
i would buy propper rings for it ,its not just how long they will last but also the machine fit
maybe you could have the bore lightly honed aswell while your in there, and it will help the new rings wear in propperly to the bore and give better compression and more power
the writing always goes on top of the rings and they are different top and bottom rings
oh right i seem like it lacks power at low revs slugish hence the change alot of people say there dt wheelie and allsorts were mine seems nothing like it could this be due to only having one ring ?
when the power valve gets adjusted you should look up the exhaust port to make sure its flush with the top of the port with ignition switched on
dont put your fingers in there till youve turned the ignition switch or you could do yourself some real damage and make sure noone touches the kickstart while you work on it
after the new rings are in the head gasket you use should be original yammy or athena(made in the same factory with the same materials)
funny you say that it drinks feul !!! well my friend has a dt and he seems to get more miles out of his witch mean must be rings and well i never new that i was just about to buy a standerd one ! so 1990 should be 56.4mm
check the line where the top ring reaches to in the bore ,if theres a lip its worn
and it could be ovaled ,i personally would take the bore and piston to an engineer before doing anything else they can measure the bore in more directions and tell you if its oval
if its bad you will see blow-by on the piston under the rings (dark combustion marks)
blow-by =low compression ,low power ,harder to start,drinks fuel etc
-- Edited by GADGET on Thursday 8th of December 2011 11:09:32 AM
sound just like the low compression cuz of the low power and the drinking feul part sound like a rebore it is then when rebore would that sort the new piston and rings etc at extra cost ?
when you take your piston out clean it up and look on the crown
it should have a number on it this will be the size
if not look inside the piston if it says prox its probs the original one but measure it anyway
when you put the new piston in its got an arrow that has to face the exhaust port hope this helps dude
ps as soon as the bore is off stuff a clean rag in the opening or you could drop the clips in the bottom end leave the cloth in there till the bore is going back on .
yeah that what i meant m8 by offsize piston your year had a slight bigger piston .. but if you buy a piston an take it with you to the cylinder engineers it wont really matter personally with it being 56.4 already id go for a +1 and a rebore
leave the cloth in there till the bore is going back on .
