I think there's something not quite right with my mc18;

The chain fouls the swingarm itself, i.e. a straight edge run along the bottom of the chain line from the front sprocket to the rear sprocket would rock on the swingarm itself, never mind the chain slider.

It's even worse with the f3 linkage plates as they raise the rear and thus put the swingarm pivot further into the chain line. Run like this it wears out a chain slider in about 45 minutes and then proceeds to wear into the swingarm.

The only thing I can think of is Steve did mention that the frame is r2j, however the swingarm is from an r5k.
Is the r2j swingarm straight? The r5k one has an upwards kink in it about 8cm from the swingarm pivot itself, if that wasn't there the chain would clear the swngarm.

Anyone got any other thoughts?
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I'd have to have a look at all my swingers but my chain clears my arm even with the F3 shock linkage and the F3 shock with added ride hight.
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If I have to take the carbs off once more...

Just had a look at the arms.

A R5K arm is much thicker (deeper) than a R2J arm around the swinging arm pivot point. I'd say its almost 1/3 bigger.

I guess thats your problem Stace.

Cant help with a swinger, got a few R5K ones but only F3 R2J ones. I might be able to russel up a R5K frame though if thats any help.

One question though. If you have a R5K swinger on a R2J frame how is your rear caliper held on?

Looking at the pic of the bike in the "garage" it seems very tall at the back and you can see the chain run is very bad over the slider even there.

As it turns out its an R5K frame so now the ruler must point towards the shock!
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If I have to take the carbs off once more...