[quote="Jonorow"]take the alternator cover off and try wiggling the rotor. sounds like a main gone or even the balancershaft bearing. I would say though that a strip down is on the cards.[/quote]

From the description does not sound like the balance shaft--but i agree it could be, fairly common ...

[quote="keithl8187"]Had a similar issue myself, cleaned carb, replaced pilot jet but still had idle and starting issues. Cured it by setting the float height correctly. In my experience setting the float height with the carb held upside down gave a false setting as the weight of the float compreses ...

[quote="fallenmikethebike"]:cry: No ,your main inlet valve is letting by if you have this problem, which could also fill the crank with fuel, and worse case scenario hydraulically lock the engine [ excess fuel gets sucked up transfer ports to above piston and will not compress ,ergo engine locks ...

[quote="fallenmikethebike"][quote="dnfdaly2"]YES KEHIEN,
ill check that idle screw bit out thanks(twiddling it makes little difference increasing or decreasing revs)
as you say its an old bike--so am trying to borrow a known working carb to try-will either confirm or eliminate a carb problem

ECU ...

YES KEHIEN,
ill check that idle screw bit out thanks(twiddling it makes little difference increasing or decreasing revs)
as you say its an old bike--so am trying to borrow a known working carb to try-will either confirm or eliminate a carb problem

ECU MAYBE?

[quote="fallenmikethebike"]Perhaps ,a twiddle with the pilot mixture screw might help ,it sounds i.m.o. that it may be running slightly weak , wind in mixture screw 1/4 of a turn at ago, be prepared to raise the idle speed as well though to rebalance.
Regards Mike[/quote]

unfortunately a lot of ...

any one have any pointers as what would be the likely cause of poor tickover,
bike is a 250 2 stroke with a klien carburettor
symptons are
starts fine with choke
runs fine with choke
tickover fine with choke

take choke off will run fine-ish on anything above tickover
on tickover poor pick up and ...

[quote="knackeredMk1"]It shouldn't effect idle at all in that if it stays in the same place and idling is adjusted to allow for the powervalve position. Not sure what would happen if the powervalve were to open when idling :? . Anyone know :?: .

Shouldn't happen anyway.[/quote]

thats what i would ...

whilst i understand running without power valve will effect performance

will it effect the engine when purely on idle?
ta