Search found 32 matches

by westeagle
Sun Jun 21, 2020 11:28 am
Forum: Vintage (1948-1969) Motorcycles
Topic: Clutch Slipping on R50; Oil turns Black quickly; Piston ring gap -all related?
Replies: 11
Views: 616

I mean the piston ring end

I mean the piston ring end gap.
It was the following article
https://bmwmotorcycletech.info/pistons.htm
where he says the end gap he usually went for was between .5mm and .6mm

by westeagle
Sun Jun 21, 2020 10:44 am
Forum: Vintage (1948-1969) Motorcycles
Topic: Clutch Slipping on R50; Oil turns Black quickly; Piston ring gap -all related?
Replies: 11
Views: 616

Just checked compression

I just came back from purchasing a new compression tester and cold I get to 115lbs after about 5 kicks.

The .5 mm I set the ring gap to was recommended by Duane A in one of his articles.

So it seems to me that the compression is decent? Could the blowby still be a factor?
by westeagle
Sun Jun 21, 2020 8:12 am
Forum: Vintage (1948-1969) Motorcycles
Topic: Clutch Slipping on R50; Oil turns Black quickly; Piston ring gap -all related?
Replies: 11
Views: 616

Clutch Slipping on R50; Oil turns Black quickly; Piston ring gap -all related?

Hello Recently dismantled the engine on my 1957 R50 a second time in a year to replace an oil-starved new piston which had serious scoring. Had the cylinder honed, replaced piston with another new one, and drilled out the right side oil passage which the R50's of this age did not have. Finally, I ga...
by westeagle
Sun May 03, 2020 7:20 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Dynamic timing -what RPM?
Replies: 6
Views: 353

Thanks!

Thanks Klaus

Excellent information. Much appreciated!
by westeagle
Sat May 02, 2020 9:29 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Dynamic timing -what RPM?
Replies: 6
Views: 353

What RPM though for idle?

Hi Jambo

Last time I tried dynamic timing a few months ago, I could not see the S mark at idle -was very frustrating -until I lowered the RPM to 900 ish.

I was wondering if there is an ideal RPM at idle, at which the reading should be taken?
by westeagle
Sat May 02, 2020 9:24 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Dynamic timing -what RPM?
Replies: 6
Views: 353

Much closer...

Thanks gents! I started the procedure again from the top -even taking off the magneto rotor and resetting to as vertical as possible; Matched the notch in the V; All while flywheel on the Mark just above "S". Adjusted breaker gap; Then adjusted the breaker backing plate just to the point that my Buz...
by westeagle
Sat May 02, 2020 7:41 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Dynamic timing -what RPM?
Replies: 6
Views: 353

Dynamic timing -what RPM?

After I set my static timing, I am ready to do a dynamic timing using a strobe. A few questions: Is there in ideal RPM to fine tune the idle setting? What mark am I looking for in the window at IDLE? "S"? Then when I rev it, what RPM should I start seeing the "F" mark at? If the "F" mark is low in t...
by westeagle
Sat May 02, 2020 5:52 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Magneto marks question
Replies: 3
Views: 214

True North?

Could the punch marks be the true north/south parts of the magnet as measured after manufacturing?
by westeagle
Sat May 02, 2020 3:48 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Magneto marks question
Replies: 3
Views: 214

Magneto marks question

I started from scratch today to reset the timing and always wondered what the round punch marks beside the opposing factory slash marks meant? (see photo). Would they have been put there by the factory, or by a service shop as a reference?
by westeagle
Fri May 01, 2020 3:59 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: R50 running rough -electrical questions
Replies: 6
Views: 347

Buzz Box

I think so. The device is more than just a continuity meter. I believe it measures capacitance. It is mentioned in the Betjemann book. -So I guess I just answered my own query: the reason the buzz box is used is that a regular continuity tester shows no difference whether points are open or closed, ...