Performance Parts?

[87srvsnow]

What are the best and cheapest ways to get more performance out of my 6.0 hp Tecumseh engine? I have already taken of the governor.

 

[EagleTalons]

Port and Polish. Better Carb. Header.

 

[87srvsnow]

carb sounds expensive. where would i find a header? just some racing online store?

 

[jetlag]

carb sounds expensive. where would i find a header? just some racing online store?

If you have a welder, make your own.

 

[EagleTalons]

I bought a Mikuni 22VM for 26 dollars. Only missing one part. Also the header you could easier make one. Just get some pipe and bend on a vice. Then cover the hole thing in header wrap so then no one sees the scars from the vice.

 

[jetlag]

I bought a Mikuni 22VM for 26 dollars. Only missing one part. Also the header you could easier make one. Just get some pipe and bend on a vice. Then cover the hole thing in header wrap so then no one sees the scars from the vice.

I "found" a shopping kart and cut some pieces off that had 90degrees.

This took about 5 minutes. I reused the flange off the stock muffler.

 

[87srvsnow]

I "found" a shopping kart and cut some pieces off that had 90degrees.

This took about 5 minutes. I reused the flange off the stock muffler.

thanks man! my friend and i made this one after we saw yours, its so loud! i think it gained a little power to.

 

[jetlag]

That looks good, and mean! hah

Yeah, I'm pretty sure my motor gained a little bit of power.

 

[87srvsnow]

it sounds like a harley when you reving it up, this is definatly the sickest thing yet. thanks man!

 

[87srvsnow]

I bought a Mikuni 22VM for 26 dollars. Only missing one part. Also the header you could easier make one. Just get some pipe and bend on a vice. Then cover the hole thing in header wrap so then no one sees the scars from the vice.

how does a carb help? like, what does it mechanically do to help, just more gas flow?

also with the header thing, just any pipe would work? so just weld flanges on like the same i did with the exhaust? also sorry to ask again, but how does this help, what does it do?

sorry if im being a pain but i like to understand things so if anyone ever asks me questions i would be able to answer them knowledgeably. [if thats a word]

 

[Kaptain Krunch]

A better carb will flow more gas, however it wont always help all that much with a stock engine, because there a limit to how much gas can flow with a stock cam, piston, etc. Im not saying it wont help a stock engine though, because it will. The only other thing to consider with a carb upgrade is that you most likely wont be able to hook up the governor to aftermarket carb.

Same with the exhaust, you want the exhaust gasses to exit as fast as possible (with a 4 stroke, 2 strokes are different), so a straight pipe will let them leave much faster, and make the piston work less pushing out the gasses.

Your not being a pain at all, the only way to learn is to ask questions.

 

[87srvsnow]

A better carb will flow more gas, however it wont always help all that much with a stock engine, because there a limit to how much gas can flow with a stock cam, piston, etc. Im not saying it wont help a stock engine though, because it will. The only other thing to consider with a carb upgrade is that you most likely wont be able to hook up the governor to aftermarket carb.

Same with the exhaust, you want the exhaust gasses to exit as fast as possible (with a 4 stroke, 2 strokes are different), so a straight pipe will let them leave much faster, and make the piston work less pushing out the gasses.

Your not being a pain at all, the only way to learn is to ask questions.

thank you, so what your saying is there is no guarantee that carb or header will help since there is a limit to the amount of fuel which can be in the cylinder. is this right?
is there any chance that a header could cause a loss power? because i find fabricating parts to be extremely fun. i dont know why, but its just really fun to make something out of junk and then see it work and do some good.

 

[Kaptain Krunch]

Im saying the gains are limited by other engine parts. There is no doubt a header and/or better carb will help. There are no downsides to a custom header besides the noise gain. Just dont make it too short, also make sure the ID of the pipe is the same as the exhaust port.

Its completely natural to like fabrication. Its fun!

 

[EagleTalons]

For mikuni slides you can make a "governor" out of a piece of rubber hose in the spring area to limit the throttle travel.

 

[87srvsnow]

on the exhaust pipe make sure the ports are the same? ya they aren't really to close and i was looking at it thinking that might be a problem, my pipe is smaller. i'll just try my best to drill out the hole as big as i can with out ruining the pipe. thanks

what would happen if i made the header to short? ill try my best to make it the same distance though.

i think i took the governor off the carb i have right now.

 

[mike75925]

are you running the stock breather element? try a higher flow one, adjust your fuel/air and get gains. most engines are rated with out air filter or exhaust. it seems fourstroke pipes are opposite two stroke expansion chambers. the larger diameter, the better top end to an extent, the stock or slightly smaller will show gains in bottom end. you could degree the cam or flywheel, use rockers that are shorter on the pushrod side for more deployment. lash caps, longer lifters, anything that will keep the valves open a bit longer will aid you. if you go to far without upgrading your jets, and eventually boring or replacing the carb, you would develop a lean condition thereby roating the piston in extreme cases.

 

[87srvsnow]

a stock breather element? like an air filter? then yes.
and the rest i need to let soak in a minute, haha. so what your saying is, do anything to get the valves to lift higher. how do i know how much to tune the fuel air mixture?

 

[mike75925]

plug chop is one method, other wise buy a pack of plugs and run one at a time for different throttle positions. depending on who you ask there are different places to read the plug and different colors that it should be. http://justkdx.dirtrider.net/printcarbtuning.html i found it very informative, but small engine carbs are a bit different. yes getting the valves to open more is relatively cheap and easy. sooner or later you will need more fuel/air, and higher compression.

 

[87srvsnow]

thank you. it'll take me awhile to read that but im guessing it'll be worth it.

 

[Kaptain Krunch]

As for the short exhaust pipe, dont get it get any short than say a foot if its just a straight pipe. If its too short, the rush of cold air when the engine is shut off can make the exhaust valve(s) brittle.