Ha. That's the funnest explanation so far.
2 Stoke no power under load
- Thread starter fun(x)n
- Start date
Tune-A-Fish
BOTM LOSER Proudly Deplorable
deviant said:
I did that a lot on my old dirtbikes to get through the weekend trail riding, dang old DT would run like new with a rag and emery hone and rings
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?
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?
Tune-A-Fish
BOTM LOSER Proudly Deplorable
teazer said:
I prefer the K.I.S.S. method on this one... I really have done exactly what I said to get by and finding parts for this will not be a dial up the dealer task, there are some restorer dudes willing to coat the jug and with new rings it would last..... well forever?
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
Moral of the story: buy quality tools.
The last time I used this gauge was probably around 2008 and always on old chevy V8s, worked fine for that but I obviously need to rethink now.
| Applied | Gauge |
| 6 | 0 |
| 33 | 25 |
| 64 | 50 |
| 98 | 75 |
| 132 | 100 |
Moral of the story: buy quality tools.
The last time I used this gauge was probably around 2008 and always on old chevy V8s, worked fine for that but I obviously need to rethink now.
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.
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.
barnett468
Coast to Coast
teazer said:
Yes
barnett468
Coast to Coast
ck.mecha said:
your compression is still too low . . you could buy a new gauge or buy a new top end.
barnett468
Coast to Coast
ck.mecha said:
i told you, if the stator side seal is leaking much, it will not idle.
your piston is oddly very clean as if it is brand new . . it should have some brown staining on the top if it was run very long.
your bore no .longer has cross hatch marks and has a ring around the top which suggests it has a lot of miles on it
Alright, so finally life gave me a couple minutes to work on this. I took the carb back apart and inspected again. I also installed clear fuel lines so I could see the fuel flow; turns out the petcock that I rebuilt wasnt flowing any fuel. Took it apart and it the seal was swollen like a balloon. I will not mention the vendor..
Anyways, once I repaired that it still didnt seem to have any impact. So I raised the needle as I initially thought and now its night and day. Dont get me wrong, it still needs fine tuning but I now am able to get it to rev up and can ride it around the neighborhood to 40-50mph.
That as I expected brought up another issue. The forks need a complete overhaul.
The other issue I have is I cannot find jets or needles for this old Dellorto ME anywhere though, any known sources?
Anyways, once I repaired that it still didnt seem to have any impact. So I raised the needle as I initially thought and now its night and day. Dont get me wrong, it still needs fine tuning but I now am able to get it to rev up and can ride it around the neighborhood to 40-50mph.
That as I expected brought up another issue. The forks need a complete overhaul.
The other issue I have is I cannot find jets or needles for this old Dellorto ME anywhere though, any known sources?
Whoah. How did you do that, Brodie? ;D
Tune-A-Fish
BOTM LOSER Proudly Deplorable
deviant said:
X2 I have a hundred people I could use that with.
barnett468
Coast to Coast
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i want your bike.
i want your bike.
