Cylinder sleeving

I had a piston pin circlip let go and do damage to my right hand cylinder. Any recommendations on sleeving? Who does it ? Pros and cons versus finding a used one?

Try to find another set of cylinders. Sleeving is expensive and there is a chance the fins will be broken in transit.

I had a piston seize from overheating. The cylinder was damaged and repaired by " metal spraying ".

I don't know anymore about the process, but I have put about 50K miles on the bike since. It is certainly less expensive than a sleeve job, which can be risky.

Alternatively, you can have the bores nickel plated. The plating can be applied as heavy as necessary to fill the gouges.

Slick

There ya go Mike:





Let the record show, I heartily recommend finding a used cylinder that needs rebore and that will be the most cost effective repair.

MikeG said:

I had a piston pin circlip let go and do damage to my right hand cylinder. Any recommendations on sleeving? Who does it ? Pros and cons versus finding a used one?

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The good news is that sleeves are inexpensive and available. For me, it would be a last resort. By the time the current bores are opened up enough to put the sleeves in, there is little to no metal left at the bottom where the tappet location plates are mounted. Also, if an 850 or 750 with 850-type cylinders where there are through bolts the metal there becomes quite thin.

My guess is that a competent machine shop can install them. Bore for an interference fit, machine the spigot recess, shrink the liner or heat the cylinder block, drop them in, deck. Then bore and hone to size.

I've never used them but https://www.lasleeve.com/ primary business is cylinder sleeving. Their sleeves are expensive, and I have no idea what their labor costs.

I've never had a problem finding replacement cylinders and often standard size not needing boring.

Finally, a new cylinder from AN is under $1000.

Is this for your 71 750?

A used cyl could be bought for $200-300, depending on condition and size.
Try to find one which doesn't need an overbore which will cost about $160-240 depending on who does it and where.

Sleeving will cost more than that.

To avoid expensive shipping, get in touch with someone in your area who knows what they are doing or might know a reputable machinist. You might want to try calling Dynodave.

For a Norton I would follow the advise of replace not repair. If it was a alloy cylinder that was previously designed to be sleeved then I would do a resleeve.
Or, if you were a Man of Means, you might just pop for a new alloy block. I mean it is the perfect excuse!

If its the 850 , they threw Cortina pistons inem , 920 , or sleeved , to 960 . the sleeve might go through in a few places . didnt stop em .

750 Sleeves are available for around £50 each.
I've re-sleeved a couple of 750s with good results - any competent engine reconditioning shop can do the work.
As per previous threads not recommended for a tuned motor, but for a regular rider I've been happy with mine.