Parts sourcing - Top-End Rebuild?

[kmisterk]

Oh shit! Sounds like you really need to find a used crank, or someone to regrind yours.
In all fairness, this method has worked out well countless times in the past.
You win a few, you lose a few.
It was worth a try.

Really sorry for the wasted time and expenditures.

Latest Boxerworks credibility rating:
gspd 0%
all others 100%

Ahh, we’ll. It was worth a shot. And I gained a lot of experience along the way. Guess I’ll start looking for new cranks.

[kmisterk]

Also, in semi-related news, my brother, an automotive mechanic by trade (or, well, formerly. Still the best mechanic in the family) had so much fun helping and watching me work on my bike that he went and bought an '02 1150RT. With no compression in 1 cylinder.

I hate oilheads. Airheads rule!
none the less, my prediction:
You'll find an exhaust valve that looks like this:
download.jpg

Let me know if I'm right.

You were 100% right. How'd you know?

[gspd]

Also, in semi-related news, my brother, an automotive mechanic by trade (or, well, formerly. Still the best mechanic in the family) had so much fun helping and watching me work on my bike that he went and bought an '02 1150RT. With no compression in 1 cylinder.

I hate oilheads. Airheads rule!
none the less, my prediction:
You'll find an exhaust valve that looks like this:
download.jpg

Let me know if I'm right.

You were 100% right. How'd you know?

Common failure, bintheredunthat.

As far as your other bike's crankshaft goes, my main regret was to advise you to keep trying after you used 220 grit on it instead of 600. The 220 grit deeply scored it and removed way too much material. That's when we shoulda called it quits. Had you used 600 grit (as advised in the redneck video) I'm convinced the outcome would have been more favourable, but now we'll never know for sure.

[kmisterk]

Common failure, bintheredunthat.

what typically is the cause?

As far as your other bike's crankshaft goes, my main regret was to advise you to keep trying after you used 220 grit on it instead of 600. The 220 grit deeply scored it and removed way too much material. That's when we shoulda called it quits. Had you used 600 grit (as advised in the redneck video) I'm convinced the outcome would have been more favourable, but now we'll never know for sure.

Ahh, yeah. I'm not mad about any of it. I'm grateful for the help, and I'm now more knowledgeable about the specific limits of play on the conrod journal. I'd call that a win, even if it's a bit of an expensive lesson.

I have to say, though, that further effort on this bike may have to be tabled until next summer, as my parents place (where all the work is performed) is about to be picking back up for Busy Season, as they do, every end-of-summer, and I don't believe I have enough time to do a full tear down in my weekend-warrior availability. That, mixed with a Move my wife and I are in the middle of (to come to a final conclusion on the 14th of this month, thankfully).

All in all, I'm not giving up on the bike. It's a vintage that I want to keep running for a plethora of reasons, even if that means I have to fork out more money down the road to do so.

As always, GSPD, I sincerely appreciate what you do and have done for me. Any way I could buy you a beer somehow?

[jackonz]

Looks like you need a helping hand from someone with a bit of experience in engine rebuilding and or specific experience in these motors, I myself have years of experience in general engine reconditioning but my current R80 overhaul is my first Boxer BMW motor and I purchased a good manual to supplement the factory manual that came with the bike, having said that I have asked here questions re these motors as the manuals are sometimes confusing or miss something, there is nothing like experience.

My suggestion is seek someone close to you who can at least guide or assist you as you don't want to waste your hard earned cash, as for parts for me I have used Motorworks and Motobins from the UK as my suppliers to New Zealand, strangely parts from Australia are far more expensive, I have also used Boxer2valve.

[gspd]

https://www.ebay.com/itm/284910953117?h ... R6aQpcXWYA

[jagarra]

Here is a crank on e-bay. I have done business with this seller on many occasions, he sells good spare parts, has a high reccomendation from previous sales. https://www.ebay.com/itm/234663181720?h ... Swaz1i~Vpr

[gspd]

Here is a crank on e-bay. I have done business with this seller on many occasions, he sells good spare parts, has a high reccomendation from previous sales. https://www.ebay.com/itm/234663181720?h ... Swaz1i~Vpr

That one has 10mm flywheel bolts, kmisterk needs 11mm.

[SteveD]

I've just had a listen to the Airhead 247 spotify podcast featuring Scottie from Scotties Workshop in California. He does crank regrinds apparently.

[kmisterk]

I've just had a listen to the Airhead 247 spotify podcast featuring Scottie from Scotties Workshop in California. He does crank regrinds apparently.

Noted. Thanks for the tip.