|
|
Post by steven on May 30, 2013 15:15:36 GMT 1
Hi,
How many heat cycles do we all do before we take it out and start running it in???
thanks in advance,
steven.
|
|
|
|
Post by Roofmonster on May 30, 2013 15:35:10 GMT 1
I did 3 cycles with the last top end rebuild. I just checked the torque of the head bolts each time it had completely cooled.
|
|
|
|
Post by icarus001 on May 30, 2013 16:02:20 GMT 1
Personally I've never done any, I must have done (or had done) dozens of engine rebuilds and then put them back in the bikes and raced them. Warm it up properly, then a couple of steady laps to run it in during practise then away I went.
There are lots of myths and theories about this, some people swear by heat cycling, some people say its counter productive, in my opinion as long as the engine is built to decent tolerances, torqued properly and you warm it up properly it should be fine.
|
|
|
|
Post by rd350r on May 30, 2013 16:37:49 GMT 1
I was told Heat Cycles are only required after fitting Forged Pistons, to align the molecule's in the new piston and for it to take the shape of the bore. Never knew anyone to heat cycle a new Yamaha, Suzuki, two stroke engine back in the day.  |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 30, 2013 17:33:40 GMT 1
never knew anybody that even warmed them up properly before ragging the tits off them either, but back then we were naïve and eager
|
|
|
|
Post by icarus001 on May 30, 2013 20:06:09 GMT 1
never knew anybody that even warmed them up properly before ragging the tits off them either, but back then we were naïve and eager If you can rag the tits off them then its warmed up. My bike splutters and dies if I try to open it up before its properly warmed up. And its a pain in the arse to ride at any speed if its stone cold out of the garage, I have to warm it up for a few minutes before I even pull off. All my two strokes have been the same, some worse than others. In fact my bike talks to me ( ;D) if I get to 5,000 revs and its not warmed up properly then it splutters, whereas if its warm and ready for a bit more it will hunt on the throttle and I can feel it wanting to go. Once its properly warm its crisp and eager. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 30, 2013 20:09:29 GMT 1
Back in the day we didn't know what the engine was trying to tell us. I have a thermostat in my bike to get it up to temp quicker
|
|
|
|
Post by fatfastroger on May 30, 2013 21:27:57 GMT 1
Back in the day we thrashed them from cold, no mechanical sympathy let alone cold tyres too.
Now we treat them as such fragile objects, even with much better 2 stroke oil.
|
|
|
|
Post by Roofmonster on May 30, 2013 21:38:58 GMT 1
Back in the day we thrashed them from cold, no mechanical sympathy let alone cold tyres too. Now we treat them as such fragile objects, even with much better 2 stroke oil. Back in the day the tyres were crap - didn't seem to matter if they were cold or hot! |
|
|
|
Post by steven on May 30, 2013 22:48:00 GMT 1
ok, thanks for the info,
cheers,
steven.
|
|
