I have a 5HP B&S motor, horizontal shaft. I dont have all the linkages for the governor. Can I just run the throttle directly to the carb or do I need to remove the governor gear / shaft, etc from inside the crank case too? It looks like removing the entire assembly is pretty easy and would add some performance, but really I am just looking to get this thing running for now. I dont want to blow it up yet. Its for a minibike.
You can run B&S motors sans governor, been doing it for years on minibikes and go-karts. When the boys were younger, everyone had their own minibike and they would rip around the yard for hours until they ran out of gas. That was my only rule- no refueling a hot motor.
Removing the governor internally just allows you to rev it till it blows right? What about leaving the assmembly in place and just running the throttle cable to the carb with out the governor attached to the throttle linkage??
OK, been doing some research. Going back out to the garage to tear the motor apart, grind down the ports, remove the governor, shave the heads and make a throttle linkage.
Just ditch all of the governor parts, they aren't needed. File the key on the crank about 1/3 of the way, so you can advance the timing, and find a tilotson or mikuni carb if you can.
P.s. you won't get banned from OldMiniBikes.com, just chastised for not searching. There are about threekazilliondibillion posts about it.
get that thing done and come out to centerpoint dr off of opdyke behind the soccer arena tomorrow 6-8pm there will be a few of us out there racing the minibikes....yep i said racing minibikes.....:sonicjay:
shit you guys are right behind my work. when was the last time you guys were there? i thought i heard a bunch of small engines at like 8:30 awhile back.
Maybe next week I can make it!!! I tore the motor apart, removed the governor internals from the crank case, ground down the slag from the intake and exhaust ports, ground down the block near the valves and cylinder, and removed the exhaust. I am going to make a straight pipe I think. I dont see how to change the jets in this stupid little carb. They dont just turn out like most carbs. Im not sure if I will need to change them or not. ???
LOL thats my buddys video, i thought the same way about the minibike drag racing thing also untill i checked it out i mean how fast can a lawnmower motor go? the got these things going 8.?? @ around 80-90mph in the 1/8. prety funny to check out.
jr drag racing started out as just a "What if?" idea but look where it is now. small engines can be a hell of alot of fun. hell i built a craftsman lawn tractor that goes 35 mph. gps verified. it's a scary ride though as tractor steering is sloppy as hell.
Please quote me what info I was told on Friday??. All info I see here so far reguarding this motor and its governor has been rong, including what you told me on Friday.
After reading the last minibike thread here I bought an old heathkit boonie and put a harbor freight predator engine on it. I even picked up another doodle and put one on that too. Now the wife and I can smoke weed and ride around the yard, lol.
I need to mod the clutch spring on my stock doodle bug...
it quit running awhile ago, messed with it last weekend plug was fouled and covered with fuel, seems to run alot better with a new plug in it and the carb tuned right.
The next race is scheduled for September 10th. I was trying to talk Hancho into racing too. They race mopeds, scooters, go karts, and pit-bikes there also. All the info is on their site.
I may have to check these Sunday races out, that is not too far from me.
Hancho doesnt even own a mini bike, motorcycle or go kart (besides his RZR). I just went out and was tweaking her a bit. Used the GPS and did a speed run. 30 MPH. Is that fast slow or what compared to the race mini bikes? She still has more in her. I am just scared riding it with out a helmet, shorts, sandles and rotted out tires and a chain that keeps flying off. Still tweaking on her.
the fast minis are close to 90, the average "hopped up" mini is going 60-70. im not sure if we will be out there this sunday or not there are not alot of people that show up but were trying to change that by getting the word out there its prety fun.
oh I just remembered...I bought my dad a moped a couple of months ago, I'm not sure why but he wanted one...anywho it's in my name and registered to me, so there I do own a race moped
They can really haul ass. My stock predator motor mini did 41 before I drilled the main jet. That is fast enough for my 36 year old ass to be riding down the shoulder of the road.
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