hi all i have been looking at this fourm for a while and i can see that u guys have alot of noledg in karting so guys i need ur help i have a rotax rm1 the prob is that the kart dose not accelerate proprly from standstill i chnged the gear ratios didnt help that much i did the jeting but still the kart takes a long time to ove and there is a nother prob that it reaches 6000 rpm stalles then launches what is the cause of that prob can u also provide me with the carb powervale engine set up to make it run perfectly our mechinics r not that profesional so i need ur guys help as soon as posible cause i have a race and i want it to be in top shape once again help and thanks in advace.

Hi Saif, what do you need good performance from a stand still for? Do you have standing starts in races?

Also a bit more information would be good so we can help you out a bit more. When you say it "stalls then launches" do you mean as in completely dead - no power for a while, or just slightly poor performance.

Carb setup is dependent on local conditions, but you should be able to get to the right main jet by checking your plug after a few runs - if it's very black you're running too rich, if it is very light colored you're too lean.

hi Mikko Nassi imean by it stalls it loses a little power then launches it dosent do that in my bros kart iv tried every thing but still i cant figure it out so what do u think?

oh i forgot to tell u i need acceleration out of the turns but the stand still is very bad the engine revs a bit then starts to move i thout it was the clutch but i changed it and it is still the same what do u think

Your brother having the same kart is a massive help in trouble-shooting. Just swap parts with your brother's kart until you find the problem.

Start with trying your brother's carburetor, then exhaust, battery, power valve, ignition coil etc. etc. until your kart starts performing then you know where the problem is. Of course if you don't have time to do that before the next race the best you can do is check everything possible to see if there is a problem, such as if the exhaust baffle is broken.

Also check your reed-valve that the reed petals aren't broken, that could be causing your troubles.

thanks man really apretiat ur help.

Your racing in Jordan? how is the karitng scene over there?

WELL racing in jordan is nice the wether is great but we have a prob with our track it is that there is no grip at all the yjb bridgsotne struggle to grip we told them to change the asphelt they said they didnt want to spend more mony my bro and i r the only rm1 in amman the rest r tony kart with vortex wich i have a prob keeping up with and there r thenormal fr125 engins .

I'm really curious... What made you choose a RM1? Why didn't you think of CRG, Birel or Tony Karts?

All these other karts have Rotax DD2 chassis too.

well i chose the rm1 cause at first i didnt really know a bout karts that much so i got it it is a good chasisi but it prob is that it heavy and it is also rliable dosent break down a lot the engine is great but im thinking of buying a tonykart with a vortex engine on it i really dont know any suggestions?

Well, this is my honest Opinion on the Karts in the industry.

The reason why tony karts have a lot of wins because they hire the best drivers and the best mechanics for racing. But that doesn't mean that their chassis are the best.

My Suggestion, get either a CRG Black Star or Birel R32 with an IAME x30 Engine. That has 30hp and it blows the Rotax or the Vortex Engines.

These are the only 2 quality karts in my eyes. And top that off with a range of Axle hardness and a T11 Tillet seat and you're all set to go. Not to mention maybe get a AIM GPS Module for data analysis.

Thats my honest Opinon.

Strong, strong opinions there!

Birel and CRG are the only quality karts, and you base this on the other teams hiring the best mechanics and drivers? You're dissing the CRG team+Birel drivers and mechanics a bit there! When a CRG or Birel wins it's because of the good kart, not the driver or the mechanics, but when a Tony Kart wins it's because of the mechanics and drivers?

My feeling is that all the main brands are really good, just depends on how you set it up and drive it - sure there might be a small overall advantage between different chassis but this tiny balance changes from year to year - for example did you know that some top drivers switched away from Birel about a year+ ago because the chassis just wasn't up to scratch at top levels of karting? To be able to take advantage of any tiny advantage between chassis makes you have to be a really good driver.


The DD2 engine should be able to easily beat a normal rotax, but with the RM1 chassis it might struggle a little bit, you could use the same engine and bolt it on to a new kart, there are at least 10 brands to pick from. What kind of regulations do you race with in Jordan? If there is no weight penalty for a more powerful engine and you have no budget constraints then just find the most powerful engine you can, something like a Vortex KF1 engine, or the Aixro XR 50 Wankel engine.

What track in Jordan do you drive on Saif? The Royal Automobile club track? I've found info that there are at least three tracks there - the Auto club track, a track in Aqaba and one more but very little info on that one.

If you want, you should also consider the IAME Reedster KF1. Its VERY much in Demand now and the satisfaction on it has been incredible.

That wasn't what i meant. Don't misunderstand. Its just my Thoughts on why i don't trust my racing to a Tony. Simple.

Yeah and all Birel, Tony, CRG, etc. etc. win races all over the place. Right now in KF1, KF2 etc. it's a bit difficult to judge chassis performance as the engines play a more important role because they aren't as even as all the 100cc engines were last year.... but within a few years I'm sure the engine parity will kick in again when everyone sorts out their KF engines. Saying only Birel and CRG are worth considering is a bit extreme though, I've never heard anyone so sure of it - most dealers feel that almost any good brand chassis can win.

True Iame and Vortex KF1 engines are the ones to consider now it seems but next year things might be different again.