CRM80 build?

[F5 Dave]

Hi guys i have a question, is an Aprillia rotax 125 engine legal for bucket racing if i sleeve and destroke it to100cc. And if yes does the fact that the only vehicle it was in here in New Zealand was a Superkart make it a kart engine?

nope, a Rotax Max is a kart engine if that is what you are at & would clearly be a competition engine in the same way as a Honda RS125.

An aprillia RS125 debored would be fine

[Moooools]

nope, a Rotax Max is a kart engine if that is what you are at & would clearly be a competition engine in the same way as a Honda RS125.

An aprillia RS125 debored would be fine

Unless it is out of an aprilia bike and has been used in a shifter kart? Or were those not a rotax engine?

[F5 Dave]

Rotax make a dizzing array of engines over the years & a lot of them competition based, but a lot of road ones as well. I can't see why you'd put a road one in a kart when there is so much to choose from.

[Moooools]

Fuck you girls are funny.

While you're all arguing over Choppa's CRM80 and shit, he's off riding his BMW Superbike at Taupo. Dropkicks...........

See ya on the track soon ladies.

What a pity I won't be in Welly next year so that you can tell me how good I look from behind. Well actually I can probably finish my BE in the time it will take you to get a bike to the track.

[Drew]

What a pity I won't be in Welly next year so that you can tell me how good I look from behind. Well actually I can probably finish my BE in the time it will take you to get a bike to the track.

You underestimate him. Since I do most of the spannering around here, as soon as the motor arrives it'll be in and going.

[gav]

Look, someone could build one before him.
http://www.trademe.co.nz/Browse/List...x?id=407471061

http://www.trademe.co.nz/Browse/List...x?id=416488442

So that's $1100, should be able to flog off the CRM chassis and the NSR motor, jobs a good un ....

[RMS eng]

If a CRM80 is just a trail bike, does that make a Yamaha DT125 legal? it had a head light too and sometimes you see the engines on Trademe and I like the look of them, there was a list some where that I think Skunk put together, but I cant find it.

Rob any trail bike is a go,the motor in the RG125-150 is the same as is in the TS125R and TS200R which are more of a race bike than a CRM80.don't know if you could use a KDX125,not sure but it looks like a de-tuned kx motor.also don't know why no one uses DT motors,W/Cooled one is the same motor as in a TZR125 i had.

[wildman]

Sorry guys i haven't worked out how to post in the forums properly yet. The rotax engine i have is a 125 gearbox engine that was meant to have come out of a road bike and it came to New Zealand and was only used in a superkart. It has raised compression, ported cylinder and motoplat ignition, my contacts tell me it was an awsome engine but fairly temperamental. It runs a 5 speed gearbox which is similar to the rotax 256 superkart engine which was 250cc. It's around late eighties early nineties and is meant to be the same engine that was developed for long circuit 125cc karting in Europe at that time. I've had it for a little while now and earlier this year it was stolen but i managed to get it back, would really love to do something with it rather than have it just sitting around, bucket sidecar would be my choice.

[jasonu]

Sorry guys i haven't worked out how to post in the forums properly yet. The rotax engine i have is a 125 gearbox engine that was meant to have come out of a road bike and it came to New Zealand and was only used in a superkart. It has raised compression, ported cylinder and motoplat ignition, my contacts tell me it was an awsome engine but fairly temperamental. It runs a 5 speed gearbox which is similar to the rotax 256 superkart engine which was 250cc. It's around late eighties early nineties and is meant to be the same engine that was developed for long circuit 125cc karting in Europe at that time. I've had it for a little while now and earlier this year it was stolen but i managed to get it back, would really love to do something with it rather than have it just sitting around, bucket sidecar would be my choice.

If it is watercooled you will have to sleve it down to 100cc and if it is aircooled the carb can be no bigger than 24mm (measured at the venturi as the manufacturer did...)
That is all assuming it is not a competition based motor in the first place.

BTW how/who/why the fuck did someone steal it from you?

[Yow Ling]

the carb can be no bigger than 24mm (measured at the venturi as the manufacturer did...)

That is your interpretation of the rule , but not how the rule is written in the rules of competition

[jasonu]

That is your interpretation of the rule , but not how the rule is written in the rules of competition

It is the way most people interperate the rule. As of yet the rule hasn't been officially challenged and until the builders that have found a gap in the wording actually start winning, and I hope they do as I am a 2 stroke fan, and someone actually ponies up the protest fee the rule will continue to be a grey area.

Just my opinion, not having a go at anybody (well maybe a small dig but all in good fun).

[TZ350]

carb can be no bigger than 24mm (measured at the venturi as the manufacturer did...)

That is your interpretation of the rule , but not how the rule is written in the rules of competition

Jason may also have been thinking of the taper that is designed into the carb (and also nessasery for extracting the plug during the die casting process) and that a 24mm carb measured at the venturi will taper out to 25-26mm at the engine side of the carb.

Team ESE are gearing up to manufacture their own style of carburettor that will be for sale to all comers at $385 and includes a full set of jets and needles, a conventional bike carb layout is like it is because that is the easy way to die cast them and keep costs down their are better ways of doing it.

[wildman]

If it is watercooled you will have to sleve it down to 100cc and if it is aircooled the carb can be no bigger than 24mm (measured at the venturi as the manufacturer did...)
That is all assuming it is not a competition based motor in the first place.

BTW how/who/why the fuck did someone steal it from you?

Motor is watercooled, low life broke into back of my ute and took motor as well as 125yz motor, 125rm motor, kart frame ,axles ,rims kart trolley and tools.Got this motor back when someone tried to sell it to the kart shop my mate manages. Sorry for taking the thread away from original topic

[RMS eng]

That is your interpretation of the rule , but not how the rule is written in the rules of competition

do it how the kart clubs do,if a 24mm round plug fits in the carb its to big and cheating.or shape the same area,when i was working kart motors this what they did.unless they have changed there rules on this,ask Wobbly about the 30mm kart rule.as a note doe's any one know if V force reeds are legal

[Henk]

The round plug works fine for carbs with round inlet tracts but how many are like that? I know the XL100 carb has a shape that is closer to rectangular than round. If the plug was taken as a measure instead of area then there would be a pretty good case for all sorts of odd shapes to stay within the letter of the law. A tract that is 24mm high but well wide or 24 wide but much taller spring to mind immediately.