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Discussion Starter #61
A few weekends of activity and I'm just about ready to put the engine back together......

Head, cylinder and block have all been cleaned and taped off.....

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Then primed and painted

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The engine fins are perfectly polished, but they've come up ok.......

And the tank was stripped of paint (what a fuken shit job that is.....)



Bogged where the tank was dinted.....

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And Primed.......ready for lovely Honda Red to go on......

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My panel beating skills arent the best either, so the bog finish is not perfect, with a few wobbles here and there, but it'll do this bush mechanic.

I've checked the ring gap on the OLD TOP RING and it's showing spec 0.012" at the top of the cylinder, but I understand they should be checked at the BASE of the cylinder?

Either way, I'll replace the existing set with new, and see how we go.......hope I don't fuck up setting the ring gap,never done that before.......

I'm also considering replacing the timing chain while I've got the side off.......but not sure if the position of the cam chain tensioner warrants it? See below from when I pulled the top off originally......Any thoughts are appreciated?

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Soooo, we're making good progress......now comes the tricky bit.....putting it all back together! haha
 

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Does the cam chain have a plastic guide ?
I think you will find that to be the part that wears out before chain stretch necessitates replacement.
 

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Discussion Starter #63
Does the cam chain have a plastic guide ?
I think you will find that to be the part that wears out before chain stretch necessitates replacement.
Hi Trials Rider,

yeah it does...... but that doesn't look to be too worn....... side walls are only a couple mm high, so it doesn't look like too much of the plastic has been removed......

I'll read up on it some more, thanks mate.....(y)
 

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I've built a lot of the larger RFVC motors but never a 250 so not sure if this is relevant or not but thought I'd mention it anyway! On those the cam sprocket on the crank is not symmetrical (the teeth aren't quite central to the boss) and can easily be fitted onto the splines the wrong way round....moving the cam chain a mm or 2 closer to the crankcase....often enough for the side plates to just touch it....and make a new cam chain sound very old!
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Discussion Starter #65
I've built a lot of the larger RFVC motors but never a 250 so not sure if this is relevant or not but thought I'd mention it anyway! On those the cam sprocket on the crank is not symmetrical (the teeth aren't quite central to the boss) and can easily be fitted onto the splines the wrong way round....moving the cam chain a mm or 2 closer to the crankcase....often enough for the side plates to just touch it....and make a new cam chain sound very old!
Thanks UncleRob.....Not sure.... I'll take a look at it from my end and see if I can see what you're talking about.......
 

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Discussion Starter #66
Continued Progress.....

1. The donk is going back together.....

Strangely, the NEW Wiseco rings seem to have a Gap slightly wider than spec.....without any filing.

I guess that would normally indicate that the Cylinder is over the 77mm size of the Piston.....BUT - the existing (old) rings seemed to be closer to Spec (.012") than the new rings, so I'm guessing it's not the cylinder.....either way they've been installed and the Cylinder and Head are back on.....

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And the timing cam and chain are back in.....but I seem to be missing the locating lugs which sit at either end of the cam, just beside each bearing......not sure where they disappeared to, so will need to get two more before the Cover goes back on and I can put it back in the bike......

The Tank has come up pretty nice.....

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I gave it four coats of clear over the weekend so it's ready to go....

And I started trueing the wheels......Front Wheel was the first attempt and it also came up pretty good....I wish I took a before vid because that rim was wobbling like a piece of spaghetti before I started.....Need to go round and tighten all evenly now, but hopefully she's good enough.

(How good is the footy in the background...... :)

Rear wheel is next.....I THINK the offset on these rims is about 20mm......wish me luck. ;)
 
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