[Matias]

hey guys

I am going to buy a KT100 engine for the summer practise, but someone wanna sell me a second-hand one, he said that it's only been rebuilt for once(i've asked him to take some pictures to see whether it's new or not) so, I'm thinking of buying a new one(not blueprinted) or an old one. I don't have experience on this, Will the old one cost more than the new one considering the rebuild?

and I'm trying to find out what tire should I use, someone says that Maxxis HG3 can last 350laps and some say Mojo can last over 350laps(1 min 1lap), I don't know which version I should trust in because they're selling things to me

hope some experience ppl can give me some advice here.
thanks very much.

here's some cost list of mine (don't mind the figure and currency and how many laps, just to see if anything weird),

Version 1
Fuel 9000
Tire 6000
Rebuild 2000

Version 2
Fuel 3000
Tire 6000
Rebuild 1200

it's for same laps, but just 2 versions from different seller

[JohnKing6]

In general terms, the cost of a 2nd hand engine should be less, even if you pay for a rebuild as soon as you buy it. The KT100 is a pretty reliable engine and unless you want it to be performing at the absolute max, the rebuild should be fairly basic - maybe just a new piston ring and carb kit (the carb kit is actually the most important).

The prices percentages should look like this:

New engine: 100%
2nd hand engine (1 year old): 70% of cost of new.
In Malaysia, the KT100 SEC is rm6850 new. We can normally buy 1 year old, just rebuilt engines for rm5000 from the dealer

Rebuild: no more than 10-15% of cost of engine, assuming new piston, ring, gaskets and carb kit

Becase the KT100 doesn't change, buying a new engine isn't an advantage - often a well run-in and well looked after 2nd hand engine is faster.

I can't really comment on the tyres but generally the harder the compound the longer they last (and the slower they are). I'm not sure a Mojo D1 (the hardest Mojo) would last 350 laps - maybe 250 or so although that depends on the track surface and how aggressively you drive.

[DMmotorsport]

Hi guys !

About Engine KT, i do not comment.... as i don't know which engine this is...
Now, about the tyres i can tell you this:

I have a good relationship with the Maxxis, but the HG3, is not a good tyres, the Mojo D's are better
in this way... because of the fact that the HG3's are in diameter a bit bigger so more unstable...
AND what makes it even worse, is the fact that the stand up side of the tyres(the harnas) is very
soft... so it's a 'flexy' tyre. i hop you understand what i mean...

in the meanwhile, we used this tyres on Holland NAtional championship KF2, and we designed 1 chassis
specially for this championship (only 2 races), this chassis is made very soft to handle the
tyres... and the combination of this MG3's with our prototype chassis is very good.....

On the other hand, this chassis we builded in 2009, and we do not use it anymore...
it's a Jesolo JP1-evo on homologation, but a bit changed for me on request at the factory...
the chassis is supplied with Brembo brakes, and all is inclu.... only races 2 of 3 races
and about 4 practices... so it's pretty new...
SO, if you would be intrested in this chassis, let me know, and i can sent it over to my new
workshop in Malaysia, within 20 days, and you can have the chassis very cheap for a 2nd hand
of 2009 !


Ciao, Kristof

[Matias]

the KT100 SEC is rm6850 new. We can normally buy 1 year old, just rebuilt engines for rm5000 from the dealer

you mean rm500?

thanks for these infos John, we're not going to racing, we just practise. it says KT100 wants rebuilding every 20hrs, but I suppose it could be a bit longer?

and about the fuel wear, how much gasoline likely needed for 1lap (or 10laps) in a normal 1200m track? I heard that KT is low consumption relatively.

can anyone give me some info generally? thanks

[JohnKing6]

On the engine, I meant rm5000 - this is how much we pay for a 2nd hand engine that's just been rebuilt.

Fuel consumption on the yamaha isn't bad. As a rule of thumb, you should get thru about 5l of fuel/oil mix every 30 mins of driving but again this depends on the weight of the driver, the layout of the track and how hard you're pushing the engine.

[Matias]

well, the dealer showed me some pic,

this KT has no clutch, tell me it's not worth for rm2400 , and the worst thing i think is that i can't test it now, so maybe it's better to find a buddy who knows it better to test some other engines

[DMmotorsport]

WOOOW, Museum - material man !

This is really OLD-skool ! And the Walbro Carbu, hihi, good old un-safe times.. hahah

This an engine to put on you closet you know, clean it up, and just keep it as a memory of the
good-old-unsafe-18.000RPM-times....
But there are now good engines for sale, which show a good alternative for hobby AND race...

Ciao, Kristof

[sprocket]

Looking at this engine it seems fine. Dont be put off by the post from another member here. He doesnt know what he is talking about. The KT has not really changed much over the years and it is a proven product that will give you many hours of track time and not un-safe at all. The only changes over the years is the additional of a clutch and starter kit while everything else remains the same.In Australia, the KT 100cc direct drive class, Clubman Light I think thats what its called is one of the most competitive class. Dont know if they still run it. Some of the drivers in this class have enginges that are around 10 years old and still run very competitively with a little tlc.What you need probably is to clean it up, maybe change the piston ring, new carby repair kit and off you go. You got to know how to push start though but all that is really worth the effort from the amount of fun you can get from this engine. Keep it around 16,500rpm and you will be smilling for a long time.

[DMmotorsport]

Looking at this engine it seems fine. Dont be put off by the post from another member here. He doesnt know what he is talking about. => you can say it straight to me.... pleas show some balls if you got them...

The KT has not really changed much over the years and it is a proven product that will give you many hours of track time and not un-safe at all. The only changes over the years is the additional of a clutch and starter kit while everything else remains the same.In Australia, the KT 100cc direct drive class, Clubman Light I think thats what its called is one of the most competitive class. Dont know if they still run it. Some of the drivers in this class have enginges that are around 10 years old and still run very competitively with a little tlc.What you need probably is to clean it up, maybe change the piston ring, new carby repair kit and off you go.
Nobody say that ENGINE is unsafe, so please read everything over 1 more time before attacking...
AND about the engines, don't shit around about Australia, or Canada or Haitti, or wather, we talk about karting, right? The 'good - old - WorldWar2 - times are over'... there are lots of engines for sale now which
are fast, cheap, reliable and easier to maintain for hobby drivers !

You got to know how to push start though but all that is really worth the effort from the amount of fun you can get from this engine. Pushing times are over, we discovered the bendix, and electronics now...
And when your a starter driver, or just wanne make fun, you don't wa run through the pitlane like the 90's

Keep it around 16,500rpm and you will be smilling for a long time.
=> "yes, pleas don't go higher, that's bad for the engine"
@ Sprocket: what's smilling? or you mean smelling around?

[sprocket]

You do not know what you are talking about. There, I've said it. Happy now??

[DMmotorsport]

Buuuwaaaa..... yes, excually i am happy... good feeling, not bad... excually the same as before
you said it ... Pro-ba-bly... Beeecausseee... you talking shit ....

ciao, Kristof

[Matias]

pushing start is cool

[sprocket]

Pushing start is cool, that is, only if you can get it started within a few steps. Pushing up and down the pit lane is not cool and downright tiring. You will also notice all your friends who were around you earlier either had dissappeared all suddenly gone deaf when you try to get them to help! So make sure you have the carby properly primed and a clean plug to start off with. The KT is a great engine with reasonably minimal maintenance and should give you much fun and enjoyment. The power is a little on the low side compare to the new generation of water cooled engine(KF, X30, Max, etc.) so there is really not much point in running sticky tires. A SL compound will work fine and provide plenty of laps and also to keep the costs down. And by the way, those who knows better anyway, the KT is definitely not a muzeum piece so if you gonna buy this engine.


Here is a link which might help or make some fun reading: http://www.karting1.co.uk/how-to-bumpstart-a-kart.htm

[james lee]

Yes, pushing kart is cool & not everyone can do it on their own. It is also like "choking", show as if the driver is really in control while driving fast.
Just make sure the throttle cable isn't stuck when you push start. Driver fell down & kart drove off with no driver!!!

[sprocket]

Driver fell down & kart drove off with no driver!!! Sounds really funny now and also when you see the kart running away from the driver. even more funny when driver tries to hold on to kart and usually falls over and a couple of tumbles afterwards. Not funny though when you are the driver!!!