Heathkit Boonie Bike Finished!

bullseye670

bullseye670

New Member
#4
#4
ole4 said:
Really came out nice. Just curious, is the carb mounted on a rubber hose? If it is does it shake much?
Click to expand...
That is a good Question. It's a flatslide Mikuni carb. It is designed to mount to a rubber hose. There is a metal tube that mounts to the head, then the normal practice is a straight rubber hose over the metal tube. The rubber is about an inch longer than the tube.
I found a 45 degree bent hose made for it. In it's normal install, the carb shakes a lot. I took a pair of cutters from Home Depot made for PEX tubing and shortened it to as close to the elbow as I could and still leave enough hose to mount the carb. Removed about 2".
Doesn't shake much at all now. Did the same thing on my go kart.
If I idle down too low, my engine really shakes. The carb was spitting fuel out of the overflows. That's with it the way it is now.
 
Minimichael

Minimichael

Well-Known Member
#6
#6
It looks fast. Congrats.
On the carb mount, I recc the 4-ply silicone hose – if you can find it.
I've read lengthening the carb manifold can also improve low-end torque ... or responsiveness, or something.
 
sparkwizard

sparkwizard

#7
#7
Minimichael said:
It looks fast. Congrats.
On the carb mount, I recc the 4-ply silicone hose – if you can find it.
I've read lengthening the carb manifold can also improve low-end torque ... or responsiveness, or something.
Click to expand...
I thought the opposite was true.
I thought short, narrow manifolds were better for low RPM, like short, narrow tracks and longer, wider manifolds were better for longer, wider tracks. That might only be true for multi-cylinder applications, though.
 
Minimichael

Minimichael

Well-Known Member
#8
#8
sparkwizard said:
I thought the opposite was true.
I thought short, narrow manifolds were better for low RPM, like short, narrow tracks and longer, wider manifolds were better for longer, wider tracks. That might only be true for multi-cylinder applications, though.
Click to expand...
Narrow sounds familiar, too. But something about the charge already being loaded was what I thought I read.

Anyway, I don't see that carb shaking much. Hey and please let us know how it rides! Looks fun. Can't wait for summer.
 
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scrappybunch

scrappybunch

Active Member
#13
#13
Growing up in the early 70's there was a kid on our street that had a boonie bike. I was so friggin jealous!
Yours looks awesome! Now I'm jealous of yours lol
 
bullseye670

bullseye670

New Member
#14
#14
Thanks for all the replies. Yes, that is an oil drail hose. "drainzit"
I was glad the fuel pump worked out. I had a tank on top of the engine with a side fill, but I still couldn't get the cap off so I found the spun aluminum one. Pretty happy with that decision.
Weather's going to be crappy the next few days. I'll get a ride soon.
 
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