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Search found 7 matches

by pcmenten
Thu Feb 23, 2017 9:41 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: engine build - slowly but surely
Replies: 196
Views: 99735

Looks like a 348 back there. Very cool.
by pcmenten
Fri Jan 27, 2017 9:49 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: engine build - slowly but surely
Replies: 196
Views: 99735

Please forgive the expression, but I've seen motorcycle 'porn' before, and this goes beyond that. This is machinist art at its best expression. This is the quality of work done on vehicles like a Ferrari.
by pcmenten
Wed Jan 25, 2017 6:45 pm
Forum: Brakes | Exhaust | Suspension | Maintenance
Topic: CL77 Rear Shock Spring Retainer Failures
Replies: 9
Views: 6097

It might be worth trying to do some failure analysis on that. Did the shock have its oil? Could that have been the result of the shock bottoming out against that retainer. Which side was that on, the chain side or the other side? Is the swingarm square with the frame? Can it twist? Are the bushes in...
by pcmenten
Wed Jan 11, 2017 8:22 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: 360 to 180 degree crank
Replies: 26
Views: 15858

Very interesting information about the crankcase volume. So here's a stupid idea; use the pumped air of the crankcase to feed the carburetor. It would require a reed valve on the crankcase air inlet, but the result would be a supercharged engine.
by pcmenten
Fri Jan 06, 2017 3:48 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: engine build - slowly but surely
Replies: 196
Views: 99735

Two thoughts;

Is there a reason why the designers might have done that deliberately?

Could the brake shoe have been bent during its lifetime?

Nice to see something being put together by someone who sweats the details.
by pcmenten
Thu Jan 05, 2017 5:39 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: 360 to 180 degree crank
Replies: 26
Views: 15858

Carburetion

The reason for the 180 vs 360 crankshaft is the head and the carb(s). Although I'm new to these bikes, I think figured that one out. If the engine had a 180 crank and a single carburetor, the carb would see two pulses of air, one at 0 degrees and the next at 180 degrees, followed by a long pause at ...
by pcmenten
Wed Dec 14, 2016 5:06 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: 250 and 305 heads
Replies: 7
Views: 4366

New Dream 305 owner

Hi all. I now have a 67 Dream 305. It needs to be put back on the road but it is complete. Thinking in terms of performance improvements for a daily drive type use, I have looked at the big bore kit. I'm also quite curious to learn more about using a 250 head to create quench. If anyone can direct m...




 

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