2 Strokes Down Under

Jeepers, 15 or 20 cycles to get mixture up the transfers? Really? No. You can build a fresh engine without a drop of fuel in it, bolt on the carb, kick it twice and it's running. The cylinder has enough mixture in it to fire and run after 3 or 4 revolutions. Must be time for some maths revision , m...

That looks very much like a current Stihl technology that uses two carb throats in a staged arrangement. The primary is conventional while the secondary is just a butterfly and is air only. It's probably not quite accurate to call it a stratified charge but the idea is that the porting is arranged s...

2TInstitute wrote:E85 is half way to a methanol setting ,the old petrol to methanol conversion factor was 1.5X with e85 it's about 1.25X

2T, how does the cooling effect of e85 compare with that of straight methanol?

I've had limited experience with methanol. One thing I'd stress is checking the available fuel flow of the entire system from the tank through to the needle and seat. It's not uncommon at all to find that it simply can't keep up with demand so it's easy to cook pistons even with appropriate jetting....

2TInstitute wrote:Use Arrum plating at your peril.

If your making a liner making the liner out of 6061 aluminium and having it nicasil is much better(and cheaper) than a thick iron liner.

I've heard the Aurum horror stories, will be giving them a wide berth...

OJ, were you looking for a new, or big bore Fe sleeve, a custom Al unit, or re-plating the existing bore? Tried this mob? http://www.nickesil.com Or if its a sleeve you want, these blokes seem fairly reasonable price-wise, - even taking the exchange rate into account.. http://www.advancedsleeve.com...

Any recommended blank liner suppliers in AU (or anywhere else for that matter)? I've used Electrosil before but they're bloody expensive..

You can get auto wire from ebay, as well as high quality connectors like Weatherpack and Metripack and the tools to suit.

BRG1200 wrote:Jeepers, 15 or 20 cycles to get mixture up the transfers? Really?

No. You can build a fresh engine without a drop of fuel in it, bolt on the carb, kick it twice and it's running. The cylinder has enough mixture in it to fire and run after 3 or 4 revolutions.

back in the day the 350 yams were as fast as the 70s/80s 750s.... yeah right. they were quick, but not that quick.... The little yams did win quite a few races over much bigger bikes, but it wasn't because they were faster. The tyre technology of the time simply couldn't keep up with engine perform...

Nothing at all to do with bikes or two-strokes but the Z-Crank is just too good to not share.

well bring forth the discussion, the only good one I can think of is a good collection of things that are complete bullshit and old wives tales that get bandied around year after year. Next is a shitlist of truly shit products that we got sucked in/almost sucked in by the hype. OK I'll start. What ...

well bring forth the discussion, the only good one I can think of is a good collection of things that are complete bullshit and old wives tales that get bandied around year after year. Next is a shitlist of truly shit products that we got sucked in/almost sucked in by the hype. This could be intere...

Thanks James, that's exactly the sort of info I was looking for.

Mikuni flat slide stuff - TM, TMX, HSR etc - is hard anodised black, maybe this is something similar. It's quite possibly original; the OEMS carbs were often specced differently to the aftermarket carbs of the same type. I liked the old VMs with the chromed brass slides - smooth as silk. A bit off-t...