Pafrig
07-08-2010, 12:10 AM
Ok, so im taking a small engines class at a vocational school, and were making theese lame kit go carts as a final project. the teacher handed out engines, the most powerfull being a 4.5hp briggs. For some reason, he gave me the project from hell, (a gocart which a previous student had tried to extend, fail misirably, then lost half the peices.). in the last few days ive repaired the frame, found peices, and got it back together. then the teach gave me a 3 hp flathead briggs with an almost dead clutch. 1/4 mile in about 5 miniutes, know what i mean? after reciving quite the load of from the other people in my class about my snailcart, i went outside looking for a replacement engine. what i found (and the teacher said i could use) was a REAAALLLY OLD snowmachine engine.. Its a Hirth 191R4e 300cc with a snowmobile clutch. the thing is air tight, has a cable for a pullcord, awsome compression, good spark, carb is clean. Brought it home tonight to get it running. ran into a few problems with fuel not pumping...
the first thing i did was wetted the old gaskets inside the carb, (specifically the one way flappers) and that kind of helped. The engine would now suck fuel up the intake hose, but only when choked. This was the first confusing thing.
after pulling it over i got a few pops, then a few more, followed by a few more. but nothing consistent. the plug was wet every time i took it out. i tried leaning down the mixture, tried a bunch of adjustments, ran best when gas was poured into plug hole. i figured that it was a problem with the carb. so i took the airfilter off and pulled it over for the hell of it, and air came back out the carb.........
obiously somethign was wrong, right? I just figured that the reeds werent functioning properly. guess what? NO REEDS.Not even a place where any reeds could possibly fit. wtf? I asked my dad who spun wrench for 35 years, and he said he had only seen one 2 stroke (an old detroit diesel) that had no reeds, but he didnt understand how it worked. Basicly, im really confused. How is this supposed to work?
the first thing i did was wetted the old gaskets inside the carb, (specifically the one way flappers) and that kind of helped. The engine would now suck fuel up the intake hose, but only when choked. This was the first confusing thing.
after pulling it over i got a few pops, then a few more, followed by a few more. but nothing consistent. the plug was wet every time i took it out. i tried leaning down the mixture, tried a bunch of adjustments, ran best when gas was poured into plug hole. i figured that it was a problem with the carb. so i took the airfilter off and pulled it over for the hell of it, and air came back out the carb.........
obiously somethign was wrong, right? I just figured that the reeds werent functioning properly. guess what? NO REEDS.Not even a place where any reeds could possibly fit. wtf? I asked my dad who spun wrench for 35 years, and he said he had only seen one 2 stroke (an old detroit diesel) that had no reeds, but he didnt understand how it worked. Basicly, im really confused. How is this supposed to work?