lots of speed and some acceleration

[fastbooger]

so i just got this coleman ct200u 2 months ago and i put on a comet tav2 30 series with a 10 tooth sprocket front and 50 tooth rear. as it sits right now, stock everything except governor removed with 18lbs springs installed (gonna put stock springs back so motor dont blow) it goes 30 to 40 mph. 30 going up the street and 40 down the street as my street has a slight climb. i want all speed and some acceleration cause i'll be riding on mostly asphalt and gravel roads, no mud, sand or dirt. what should i do to achieve a goal of 8000rpm and around 50-60+ mph. i've checked lots and lots of forums and google a lot of stuff and even went on youtube for a lot of stuff too, but im a "honda clones for dummies" book kind of guy. most of the things i read are from an advanced person talking to another advanced person and i cant seem to understand. i kinda understand the gear ratio thingy and upgrades for the engine, but what does it mean when it says cam lift .265 or .274. anyone with a similar build please point me in the right direction. whats the best flywheel, cam, valve springs, valves, or any other thing i should do. i came across this http://gokartmods.com/gx200-modifications/
but dont understand half of it. any help appreciated.

 

[landuse]

To get RPM's of 8000, what you are going to have to do is take the governor out (which you have done), install your 18lbs springs AS WELL as a billet rod. You can also get a billet flywheel if you want. I would also put a free flow header and intake on the engine. That should get you up to 8000. With the stock springs, valve float only allows the engine to reach about 5000.

 

[fastbooger]

kool. not a whole lot like everyone else keeps saying. but why do they put in 26lb or 40lb springs or even dual valve springs. and why put in pistons and cams?

 

[landuse]

kool. not a whole lot like everyone else keeps saying. but why do they put in 26lb or 40lb springs or even dual valve springs. and why put in pistons and cams?

What is everyone else saying?

 

[Poboy kartman]

What is everyone else saying?

Or....even more telling perhaps....where are they saying this????

 

[chancer]

kool. not a whole lot like everyone else keeps saying. but why do they put in 26lb or 40lb springs or even dual valve springs. and why put in pistons and cams?

Yeah! says who :toetap05: Are you seeing another forum???
Just kidding but what land use said is what I always hear "them" saying.

 

[landuse]

I wasn't implying that anyone on this forum was giving bad information...i would have seen it, i was just wondering where this information was coming from

 

[fastbooger]

i read lots of ppl on google and youtube that you have to get pistons, rods, 14cc head, carb, head milled, intake, headers, flywheel, rocker arms, moly push rods, stainless valves, and some other stuff. thats way too much money. i just want some more power to have some fun and dont know what to buy. but thanks to you i do now.

 

[davidlamb78]

kool. not a whole lot like everyone else keeps saying. but why do they put in 26lb or 40lb springs or even dual valve springs. and why put in pistons and cams?

When your cam pushes open the valve, it will allow for the gas to come in, or exhaust to come out. You don't want them open when you are compressing the gas before the spark plug ignites. When the spark plug ignites the fuel, it burns and pushes the piston down to make the crankshaft turn. The heavier the valve springs, the quicker they will snap closed. You need heavier valve springs for more aggressive cams. If you're running the stock cam, you'll be fine with the 18lb springs.
Now, 8000 will be pretty hard to get with a stock setup (minus the governor and with 18lb springs). Going fast is expensive. You will get the most increase in RPMs by adding a bigger carb, bigger cam, and open exhaust. In order to get the most out of those, you will also want to go with the billet rod and flywheel. I know that folks here don't worry too much about them breaking, and I am okay with that. However, your rod is weak. I have seen them break. I would hate to invest a lot of money in a build, and then have it destroyed because you didn't spend the $60 on the billet rod. That's just my 2 cents.
I have a 196cc clone with a billet rod (.20 over), flywheel, 14cc head, 18lb springs, CM cam, and a fuel pump, and I can't get to 8000. I can get to 7500, and that's a blast. I've run the clones without a governor, with 18lb springs, and a rejetted carb and open exhaust, and I never got it over 6300 RPMs. It's like I said earlier. Going fast is expensive. There are many karting forums with lots of wonderful information all over the web. I think you will find that there are many great combinations of parts that will get you to 8000. The key is to listen to those who know what they're talking about, and ignore those that don't. I would suggest researching what you'll need. Good luck with your build. Have you thought about going back to the chain drive setup? I think you might get a little more top speed out of it. You can also check out the speed calculators on some of the other sites. It will help you get an idea of what gearing will help you get higher speeds.

 

[OzFab]

My simple rule of thumb is if you don't understand it, leave it alone until you do...

These engines are factory governed at 3600rpm; what makes you think it will be cheap, easy or even possible to get 8000rpm out of it?

Here's a simple fix for you: If you want more speed & not so much acceleration, simply replace the rear sprocket for a smaller one but, be careful, going too far will have a detrimental effect on the TC belt...