For those who know. When doing heavy mods to the DS if you keep the stock carb when will it start to hinder the performance? Take in account that the carb is well tuned. I ask because the 45 thumb throttle is to stiff and I do not like the twist. Any one with experience know?

 

Hurycne- slow down a dam minute. I said long ago i was modding mine. I need to breathe clean air. You need to eat my dust for a while.

 

Naw I have been building this motor in my mind for months. Back when you were beating me. Now that I am ahead I am gonna stay that way.

 

When I talked to knutz, he said that with a stock bike, that a 45mm was too much carb. He said he had a 42mm that would outflow the stocker and give better throttle response and more power.

I think that the 42mm would be ok, until you go internal on the engine. When you get cams, and piston, then the bigger carb could do what is needed, but I think with a stock engine with exhaust and intake mods, the 42mm works well.

I am interested in hearing from these guys with the lectron or other carbs on basically stock engines. I want a 703 or 760, but money is not there for that at the moment and I want to squeeze as much out of the stock internals as possible. I hear that knutz is working on some kind of new intake setup, but I am not sure if that is for stock engines or the bigger bore setups. Maybe he will let us in on some of the info.

Hopefully someone with some more experience will give us some tips.

Bat

 

Bat, Good questions! I am also interested in the new intake "mods" while I dream of the "703"!!!

 

If your gonna dream, Dream BIG. 830cc for my dreams. Oh hel yeah!!!

Biggerisbetter.

 

I said heavy mods including cams and a pistons. will the 42 work for that?

 

Hurycne,

There is one trick I've heard of to make the spring softer on the big carb. (Though it sounds like you wont need it anyhow.) Someone on these forums a while back suggested that if you grind away a little of the thickness of the coil of the spring you'll weaken it. I don't mean to shorten the length of it, if you shorten it you'll actually make it more stiff I've heard. Basically if the wire that is coiled up is 1mm thick and you grind some of it down on the outside to make it closer to .75 or .50mm you'll end up with a softer spring. I think I'd have a few extra springs on hand before trying this modification though.

 

Just get the HPD billet thumb throttle, it makes it twice as easy.

 

This is when I would jump in and talk about the Edelbrock QwikSilver carb. But it is a dead project nobody wanted it cause it was thought of as too small at 40mm. It will work with the stock thumb throttle just a little stiffer. I have not had any problems with thumb pump. It is an easy starter. It pulls hard and smooth through all gears. Throttle response is faster. Guess it was not an enough press but I am working on it.