hi!

[Rotore]

im back! lol no um i have a friend with a 250cc briggs so i was searching thru this shed and found a 399cc engine like the one i had in horrible block is in horrible condition so i wanted to know if i can take the ignition coil off the 399cc briggs and put it on a 250cc?

 

[EagleTalons]

Well...I've used a 3.5hp armature on a 12 hp. Just took some regrinding.

 

[Rotore]

regriding?

 

[EagleTalons]

To match the curve of the flywheel.

 

[Rotore]

oh ok

 

[Rotore]

another question.

if and engine has a gear reduction box for about a 12:1 gear ratio could i mont the engine directly on the wheel?

 

[EagleTalons]

You'd be going super slow, you might enjoy a clutch too ya know?

 

[Rotore]

yea just a thought that i had since im staying in the middle of no where and nothing to do i gotta keep myself busy dude

 

[EagleTalons]

Well, you could do a belt clutch and a larger pulley on the driver and a smaller on the back and have some fun with some random creation.

 

[Rotore]

yep im enjoys the hole random creation thing even thou i got a little happy with the welder and made a go kart with some lawn mower handles and 1" steel tubing i found in the back of a shop.

i got the engine running but it has no exhaust so when i got it running it had a huge back fire and burn most of the hair off my arm lmao. (my girl almost killed me when she saw me hehe)

but on another note the engine has no govener and the carb has 2 butterfly vavles (choke and throttle). i was wondering if theres a way that i can use that to govern the engine since its a pretty beefy engine dont need that blowning up on me.

 

[Kaptain Krunch]

if you have a digital tach you could make a throttle stop so it doesnt rev to high.

 

[Rotore]

if you have a digital tach you could make a throttle stop so it doesnt rev to high.

explain please sounds interesting

 

[Kaptain Krunch]

Hook up the tach to your engine, rev the engine till it hits desired redline, then
make a throttle stop so it cant go past that.

 

[freakboy]

who the hell are you noob u act like you have been here before! lol jk welcome back how things goin?

 

[EagleTalons]

Hook up the tach to your engine, rev the engine till it hits desired redline, then
make a throttle stop so it cant go past that.

Digitachs can be expensive if you don't own one. Another idea is to speed test your kart out with a 4 wheeler or a bicycle speedometer and put a cable stop in right where the engine is at the desired rpms.

 

[toofarnorth]

Hook up the tach to your engine, rev the engine till it hits desired redline, then
make a throttle stop so it cant go past that.

It seams like that would severely limit the engines potential power output considering most engines unloaded would hit redline at about 1/4 throttle, the engine would bog down and die as soon as you hit a hill. There's a reason why governors are as complex as they are, it's so that the engine can have wide open throttle when it experiences a load and shut down the throttle once max RPMs are reached. I'd say your best bet to keep your RPMs out of the danger zone and still have power would be to set up a bike speedo on your engine as a tach. and just monitor your engine speed.

 

[Rotore]

Hook up the tach to your engine, rev the engine till it hits desired redline, then
make a throttle stop so it cant go past that.

dont own one but where can i buy one if its not much trouble me asking?

who the hell are you noob u act like you have been here before! lol jk welcome back how things goin?

WSUP!!!!!!!!!!!!!!!!!! im ok i guess still having some issues but im gettin there.

It seams like that would severely limit the engines potential power output considering most engines unloaded would hit redline at about 1/4 throttle, the engine would bog down and die as soon as you hit a hill. There's a reason why governors are as complex as they are, it's so that the engine can have wide open throttle when it experiences a load and shut down the throttle once max RPMs are reached. I'd say your best bet to keep your RPMs out of the danger zone and still have power would be to set up a bike speedo on your engine as a tach. and just monitor your engine speed.

yea i tried messing with the engine without a load and even at idle it revs up extremely fast like around 7000rpm my guess. but i think i might need a new carb since its revving up that high when its suppose to idle.

 

[Kaptain Krunch]

dont own one but where can i buy one if its not much trouble me asking?




yea i tried messing with the engine without a load and even at idle it revs up extremely fast like around 7000rpm my guess. but i think i might need a new carb since its revving up that high when its suppose to idle.

If it revs right up, the butterfly may be open, i know quite a few engines where the governor holds it wide open then adjusts it accordingly.

Toofarnorth-

Yea, it would limit engines potential but it would also stop you from over revving, its a tradeoff.

 

[Rotore]

yea it does rev insanely high and i dont need it blowing up on me. i guess i should leave the choke about 1/3 of the way open to controll it.

either way b-day is this week if i have some money left over ill treat myself to another engine to work on and leave my in-laws mower in one piece :lol

 

[toofarnorth]

You should be able to pick up a cheap bike speedometer at wal-mart or any store that has a decent bike section. you then drill a hole in the flywheel cover so the little sensor can be triggered by the magnet in the flywheel then it's just a matter of programing here's a website that tells you how http://www.instructables.com/id/Tachometer-made-from-a-bicycle-speedometer-cycloc/