I have one of the German engines which I used in open 125cc races in 2006. It's fantastically fast when it's setup. It's very sensitive to weather changes for jetting and also to chassis handling. When it's going well it's a rocket. Because we haven't got any open races now, it's has run since it was rebuilt at the end of 2006!

So, if anyone wants a 35HP rotax engine, let me know, I'd be happy to discuss a deal

Thanks a lot man, btw where to get the 162 and 165 jet?

David had them?

Ken,

David would normally have the jets you want. In case you cannot get from him, let me know. I stock these parts all the time. When in doubt always go to your local rotax distributor. You have my number since you have contacted me before.

James Leong

using DD2 cylinder, you wont have any bottom end. tested that a few year ago..

the reason you 2 are not able to get any better performance from the DD 2 cylinder is from not getting the jetting and gearing correct i would very much think so. James, you can ask one of your senior mechanic and he can tell you if you really press him. i have run them before and i can say if you spent enough time playing around with it, it can really make a significant difference. and the reason for the poor bottom end like you mentioned rock, it is because it is design for running with 2 gears, but like i said, if u spent enough time playing with the jets and gear ratios, it does really make a big significance.in my opinion james, u are sounding very much just like a marketing guy from rotax feeding off whatever the track guys are feeding you and trying to not stir the pot too much. no offence for sure everyone's gotta do what they have to do.its business right?i can fully understand and accept this. and also this is only my opinion.but then the mechanics dont have to tell you everything do they....especially when you are not always at the track every time they test...................

I'll put my money on a std Max with proper jetting and gearing then a DD2 cylinder with jetting and gearing.

think in term of driving. available power band on your right foot. as a driver, i choose std every time. unless we racing on a oval.

standard is fine. just like everyone else.

Well, there are two side to the coin. If you spend enough time and effort on a DD2 cylinder with a Max engine and all things equal, you may get the power you are looking for. The end result is "At what costs?"

Anyway the end result is that the engine is illegal to race in the RMC/AMC. If racing in open series is what you are thinking, then you could spend the extra RM2500-3000 getting the conversion kit. My suggestion would be to buy another 125 engine for this purpose.

There are talks that there will be other races beside the 5 rounds of RMC in Malaysia. The other races will definitely cater for the open 125cc class. So be prepared for this.

James Leong

Tuned SuperRoK

yes! tuned superok. more so since vortex has address some of its reliability prolems. more choices soon with KF 1 engines. open 125 class will be very interesting!

Yes, the open class will be interesting but I understand that the KF1 engines will not be allowed for this class. So dont go out and buy those engines just yet. Wait for the regulations.

James Leong

U guys really into karting.

Knowledge is power,

Must absorb as much as posible.

enough of the BS, im running DD2 on standard bottom end, it is atleast 1/2 second quicker on all tracks,my weight and kart is 188kg! and im faster than all 160kg racers on every track i have been on. Tuning and gearing is the key( it has to rev) I have done 15hrs on my last piston and ring and its still quick, there is slight port timing mods done by company in US ( very minor)I am using TAG kit from Greenflag motorsports USA,these are the only mods.I have spent only $900 australian on mods.PM me if want to know more, i too had to swim through the BS before i found out for myself how to make it fly.

ya youre is quicker cuz you played your timing. I was saying just dropping a DD2 cylinder wont make it quicker.

minor mod costing A$900
might as well go for US$300 rpm limited cut.

then again might as well get a Tuned SuperRok and keep a std Max

The timing mod has not yet proven itself as an advantage as yet, the standardDD2 barrel is quicker than max barrel, if you cant get it to run quicker you are not doing it right. its faster from 7500rpm and up,this motor is otherwise stock rotax and dont forgetv im very heavy.