Ha. That's the funnest explanation so far.
deviant said:Ha. That's the funnest explanation so far.
teazer said:I can follow that.
I don't know a whole lot about that particular motor but the 125 DKW/Bantams?HD Hummer used to make around 4hp with a top speed of 45mph. The Benelli was a similar design but maybe a little more sporty, but it is not an RS125R racer for sure.
How fast will it run on the gearing that's on it now? Would it benefit from lower (numerically higher) gearing? Is it just old and tired?
You could port it and fit a modern piston and weld and machine the head and fit an expansion chamber, but is that a smart idea?
Applied | Gauge |
6 | 0 |
33 | 25 |
64 | 50 |
98 | 75 |
132 | 100 |
teazer said:You could port it and fit a modern piston and weld and machine the head and fit an expansion chamber, but is that a smart idea?
ck.mecha said:Out of curiosity today I took my compression gauge to work and hooked it to our NIST certified pressure regulator that we use to calibrate relief valves (after much mucking with finding an adapter to the odd metric size). There is an offset present in the guage, it doesnt move off the needle until about 6psi is applied. At 80psi on the compression tester gauge it has an actual applied pressure of 105psi. Not great but not as bad as thought
Applied Gauge 6 0 33 25 64 50 98 75 132 100
Moral of the story: buy quality tools.
ck.mecha said:If I can get the bike running well enough to debug any other problems, I would rebuild the top end sooner than later. Just wanted to cover all the small things first.
I fully expect scooter type speeds and powers form this, but right now its a complete turd. Which stumps me because its appears in great shape. Ive had 10 year old bikes that had more rust than this thing. Even the old SAFA 6V battery holds a charge. About the only thing I could find that would have led to it being parked was a kinked throttle cable that would not spring closed. Replaced that and like I said it idles and revs fine on the centerstand.
I would guess the case seals are probably dried out at least a little from sitting, and that would contribute to a lean condition; but surely small enough to compensate for in the short term.
deviant said:Whoah. How did you do that, Brodie? ;D
Why not? Do you want us to buy crap parts from them as well? Maybe I missed something here.ck.mecha said:I will not mention the vendor..