...and you rev them until they stop accellerating then you change gear, repeat until you are either going fast enough or in top gear. (and going fast enough)

If you stop revving it when it stops producing more power it'll be fine, you know, in a common sense kind of way, also assuming the oil supply is adequate. They sort of run out of air and timing (by design I assume) before the crank flies apart. Bear in mind though the crank is only pressed together. Factory max hp is 33hp at only 5500 RPM, they sound like they're revving so hard because they're firing twice as often as those erm less manly 4 strokes.

Think its also a combo of heavy flywheel the peanut carb as well as the timing. Super de-tuned, im sure they could punch a few more ponies out whist still being reliable.

Just as important as how much power though is where the power is produced. I remember as kids we played with a mate's YZ80C and got the timing all radical, thought it was crap until by fluke we got some speed up down his driveway and got it to rev and it almost shot out from under me. The top end was insane and it totally blitzed both his old man's DT250 and his brother's IT175. Was almost impossible to ride in the bush though and amused us for the short time it took to explode. Then we realized how much better it was stock.

well when you figure it out hayden let me know

I will be setting mine up efi in the next six months so im hoping it will make it alot more tunable. as far as port work and stuff i have no idea. but i am tracking down some carbon fiber reeds

well when you figure it out hayden let me know

I will be setting mine up efi in the next six months so im hoping it will make it alot more tunable. as far as port work and stuff i have no idea. but i am tracking down some carbon fiber reeds

Sure will!

How are you doing the EFI? Megasquirt or ??? I was thinking of trying an AFM based ECU from a 3 cylinder car with an interceptor between the AFM and ECU (because I'm cheap). Always wanted to EFI a 2 stroke...

Thanks

Hayden

The only way (or most plausable way) is to go custom ECU such as mega squirt. Just remember a 3 cyl car with EFI will be 4 stroke thus its ECU would think that its reving twice as fast if put on a 2 stroke (dizzy on 4stroke turns half speed of crank). Thus it will pretty much go into rev limiter mode straight away.

Dan

Grahame from Suzisport in springwood used to own a few lj50's in the early 80's that were pretty tough, the stories I heard and the video I saw he got he's going really well ( sounded like a bike) he changed the reeds, fitted triple carby's and played with the exahust, so either msg losfer or call Grahame, from what I hear the oil injection system on them is prone to screw up

I think it'd be easy enough to fool it into 2 stroking, but yes the rev limiter thing could be an issue. Perhaps a 6 cylinder ecu? One with sequential firing instead of bank firing would probably be easier, still be a nightmare to tune though. But yeah, Megasquirt or similar would make your life sooooo much easier.