so i think i have a bent valve spring?!

[Air4Life]

Please excuse my introducing this thread to a tangent of sorts.  

I am curious to know what to look for in determining the difference between the Nikasil coated cylinders of 1981 and on, and those made prior?

The following image link is of a Nikasil lined cylinder.  If it wasn't labeled as such I am not sure I'd no the difference.  However, looking at the damaged areas I can see the Nikasil coating as compared to the base metal and would describe it as a coating.  Maybe that exposed area would be the look of a non-Nikasil coated cylinder?

It'd be a pleasure to see pictures showing the difference, but I'll settle for the awkwardness of the written wUrd.

http://www.stephenbottcher.net/BMW/R100ST/assembly/engine/2401.jpg

[Bob_Roller]

Use a magnet, the '78-80 model year bikes have a cast iron liner in the cylinder .

The nikasil is a nickel plate on an aluminum  cylinder, non magnetic .

[Matt Chapter]

Factory hone marks -even in high mileage, well maintained engines- may often be visible low in the cylinder bore as the piston rings do not get that far down the bore.  

Dunno if I have a "high mileage, well maintained engine"... in fact, local observation would tend to disagree, but yes, the marks I saw were viewed from the bottom of the bore.

BTW, Matt... MotoGP's Honda Team Repsol is in Austin right now!

This is a terrible time for me to be without a vehicle, and not just because the race track is at the other end of town.  Now, that Repsol paint job.. nothing says "Arrest me!  If you can catch me!" quite like it.

You need a tube of hylomar (now it is sold as permatex 25249 or something similar) too).

And what does one do with a tube of permatex?  Is this the thread lubricant for the exhaust nut?

[montmil]

"And what does one do with a tube of permatex?  Is this the thread lubricant for the exhaust nut?", asks Matt.

This material is a sealer to be used where the cylinder mates to the crankcase. Prevents those nasty oil weeps. Snowbum also approves of Yamabond, available, well, you can guess where...

All that's required is a very thin smear of the sealer be applied to the crankcase joint. A dab about the size of a fingernail -yours or mine- may be spread with an cheap acid brush; the brush first being modified by trimming off half the length of the bristles. Hardware store. 0.29 cents.

DO NOT allow any sealer to get into the oil passageway. In fact, keep the sealer rather thin in the area said oil passage so the squeeze out will not block the passage. Important? Yep. Oil through this line provides lubricant to the valve train.

Permatex also makes an anti-seize compound. That's what you'll want to liberally apply to those exhaust threads. A copper-based anti-seize is my fav but it's becoming harder to find.

[Olliepup]

Amazon sells several brands of copper anti-sieze - Permatex, Loc-Tite, CRC, etc.. About ten bucks for 8 ozs.
Wavy

[montmil]

Amazon sells several brands of copper anti-sieze - Permatex, Loc-Tite, CRC, etc.. About ten bucks for 8 ozs. Wavy

Time to do some internet shopping. Thanks, Wavy D, for the tip.

[georgesgiralt]

These are easy to find.
Go to a shop specializing into parts for factories or heavy trucks and construction works engines.
Ask them you want a grease with anti -seizure properties up to a 1000°Celsius and from a reputable manufacturer like Molykote or the like.
The salesman will give you 3 to 5 alternatives and sizes from small tubes to huge 200kg  container....
Prices will be low if you buy the small tube  
Asking a local guy has two advantages :
- first you get your product right away.
- second the guy will give you very good advice because he will know exactly what he his selling... (the guy I met asked me what kind of metal I wanted to protect and when I told him it was to be put on a threaded part, he changed brand.... )
This is just my two cents, though....

[Matt Chapter]

I talked to my local airhead guy yesterday.  Apparently I rode the bike with the broken valve spring a bit too long..  Worn valve guide and cut valve stem.  He's looking for a replacement valve and talking to a machinist.  Should be another couple weeks and total roughly 300$.

When I dropped the LHS carb, I found the throttle cable was single strand instead of multi strand, so I'll be replacing that at the same time.  And, since 4 carbs are 16 times as complicated as 2, I bought a morgan carbtune.  Once I get the ol' bings reunited, I'm going to sync them.

[Rob Valdez 79 R65]

I have a replacement valve if you want it.  It should be OEM.  Not the best, but cheap and fast.
I also have springs and seats and collets.

I had a Nikasil engine that apparently saw some moisture before I got it.  There were permanent damage to the cylinder bores (can't be repaired) and I had at least one rusty valve spring.

Valve guides can only be replaced with new, but I might be able to save you some money on the other stuff.  I guess you don't need my spring compressor since you got a mechanic.

[Matt Chapter]

Thanks for the offer Rob.  I let my guy know and he had already acquired one.

In exciting news, I got the head back today.  Head cleaned, new valve, ground, etc etc.  I also needed a new left hand throttle cable, and I got a new head gasket, new cylinder base o ring.  300 USD, although we did a part swap on the valve spring and collets. (I ordered the spring first, then called my mechanic, so I gave the parts I ordered to him.) Pictures to follow this evening perhaps.

The problem is, since the R65 is so rare, he didn't have the pushrod seals in stock.  I'm about to call the local $dealer$, but I doubt they'll have them stocked either..

Who's got a line on a quick push rod seal supplier?

<edit: photos!>

[Matt Chapter]

Well guys it's done.

I tackled it yesterday evening, started after 630 or so, went out for a test drive at 1030.  Took a couple long hammers to get the job done.

The toughest parts were hand compressing the rings, getting the pushrod seals to line up (they didn't really get where they need to be until I installed the head nuts), and the exhaust clamp on the front crossover.  Who knew the screws only went into the clamp one way??

Rode it into work this morning so life is good.   8-)

[steve hawkins]

Congrats.  Hope you enjoy the rest of the summer - when it arrives.

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