Camshaft Top End Rattle

Great looking bike Don. You have done a great job. Scratching my head about the 700cc part. Please explain.



Don't get me wrong Tom, I believe in using the throttle early in the engines life, only this Motoman guy makes people think the "window of opportunity" is overly narrow which I don't believe.

He was rounding up from 675cc

The window of opportunity is pretty small.

When babied from the outset, the peaks of the hone are just rounded, leaving valleys in-tact. When under heavy acceleration (lots of load) the combustion causes the rings to expand more, and the early 'sharp' peaks are worn down more quickly and further. Eventually the heat cycles and such harden those and very little seating of rings is further possible. Getting them worn down and rings seated quickly before hardening (and a bit of carbon glaze that fills the valleys) is important for the best seating of rings.

[tkent02]

Great looking bike Don. You have done a great job. Scratching my head about the 700cc part. Please explain.



Don't get me wrong Tom, I believe in using the throttle early in the engines life, only this Motoman guy makes people think the "window of opportunity" is overly narrow which I don't believe.

That seems to be the most important part, the sharpness of the honing can't last very long. It's only the microscopic little peaks of the ridges that do anything, they will wear away quickly it seems. I get on and ride easy about a half mile, then harder and harder as the temp comes up. By one mile it's BWAAAAHHHHHuuuuuunnBWAAAAHHHHHuuuuuuBBBWWWAAAAAAAA AHHHHHHuuuu on and off the throttle at various fairly high RPM, but always wide open or closed, no in between. I do it on the highway when there is little or no traffic, so a can blast away at it, fast, slow, fast, slow.
I would never run the engine at all until it was ready to do this.

BBBWWWAAAAAHHHHHuuuuuuuuunn

[Nessism]

Great looking bike Don. You have done a great job. Scratching my head about the 700cc part. Please explain.

Why do you say this? He makes more sense than anything I have ever seen written about it.

Don't get me wrong Tom, I believe in using the throttle early in the engines life, only this Motoman guy makes people think the "window of opportunity" is overly narrow which I don't believe.

[tkent02]

Strict adherence to Motoman is folly Don.

Why do you say this? He makes more sense than anything I have ever seen written about it.

Oooh nice! I skipped a lot of this thread coz I got totally lost with degreeing cam's and things, but didn't realised I'd missed the capacity increase!

That should certainly give it some zip

I will reply with pics for your choke issue in the morning. Off to bed now.

[pete]

Oooh nice! I skipped a lot of this thread coz I got totally lost with degreeing cam's and things, but didn't realised I'd missed the capacity increase!

That should certainly give it some zip

That's lookin' real good Don!

You've done an awesome job getting it back together and looking so neat and clean. Fingers crossed your noise is gone and you get lots of enjoyment out of her.

As for the rain, I know what you mean.

When I was in Sydney last Tuesday/Wednesday the weather was great, but up here it's just come over all cloudy and rainy again the last couple of days.

Gonna be another wet spring I think...

Thanks Pete, the new 550 badges belie to 700cc motor sitting in there.

[pete]

That's lookin' real good Don!

You've done an awesome job getting it back together and looking so neat and clean. Fingers crossed your noise is gone and you get lots of enjoyment out of her.

As for the rain, I know what you mean.

When I was in Sydney last Tuesday/Wednesday the weather was great, but up here it's just come over all cloudy and rainy again the last couple of days.

Gonna be another wet spring I think...

Strict adherence to Motoman is folly Don. Just get the bike out on the road, run it around town, and use lot of throttle. 99% of all internal combustion engines don't follow Motoman's routine yet the rings seal up just fine.

Thanks Ed. I did not see any evidence of blowby when I pulled the pistons, but maybe 100 miles was not enough to stain the pistons even if there was blowby. I did run the motor fairly hard for those 100 miles. I tried to keep it under power most of the time, if not doing that then I was decellerating.

Project finished, unless the motor gives me more problems. I fitted all the paintwork today and now we have rain predicted for the next week. Can you believe they have just declared the seven year drought is over/finished. Don't know when I will get to ride it now.

A few pics for your purusal. The color is not quite right, it must be my camera. The blue is not as pale as in the photos.














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[Nessism]

Strict adherence to Motoman is folly Don. Just get the bike out on the road, run it around town, and use lot of throttle. 99% of all internal combustion engines don't follow Motoman's routine yet the rings seal up just fine.

Popping on the exhaust could be due to impurities in the exhaust, engine from cleaners etc....

I would get it out on the road & run it or adjust the pilot screws out a bit to compensate then go run it.... (that's me though!)

Thanks Dan, will do.

[salty_monk]

Popping on the exhaust could be due to impurities in the exhaust, engine from cleaners etc....

I would get it out on the road & run it or adjust the pilot screws out a bit to compensate then go run it.... (that's me though!)

Yes Ed, I started it on Friday night, but only ran it for 2mins, as Motoman says not to idle a new motor or free rev it in shed just to hear it. It should be run under load on the road so the rings bed in properly. Although the fact that I have already put 100 miles on these ring,s then the window of opportunity may have already passed. Anyway I want to do the best thing for my motor that I can.

I am currently working on my freshly painted fuel tank, as I cant run the bike on the road without a tank on the bike. Should get it on today.

BTW when I started the bike for the 2mins, there was some popping from the exhaust as I was revving it. Could this be too lean on the pilot circuit. I did replace the 150 pilot air jets with 175s while the carbs were off. Remembering these carbs came off a 650G which had 160 air jets as standard and the 650E had 175 air jets as standard. That's why I made the swap and the fact that it was really rich the first time round (original rebuild).

Thoughts please?

[Nessism]

What's going on with your engine Don? Had a chance to fire that bad boy up yet?

Not Long Now -- Nearly Ready to Start

Almost done -- Should be able to start her on the weekend.

Just one more task to go. Fit the headers and silencer.








Keeping fingers crossed for a silent motor.

Since last time I posted I have fitted the generator cover, connected the wiring up, starter motor, clutch, carbs, coils, etc. Filled motor with oil, and spun it with car battery so oil light goes off. Removed valve cover because I forgot to oil the shims and valve gear and put moly on the cam lobes. So just headers to go and then hit the starter.


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