SPR & RS

[Mananon]

Looks lovely Karel.
Do the SPR's come with black mirrors as standard?

[ybk]

It's been a while 

I have only put on around 200km since finishing up the SPR Took an extended run this week and pushed the revs a little higher and unfortunately the clutch was slipping. I know the plates are good so that left the big seal . (Even with a dry clutch full of oil the ZX400 I came across didn't stand a chance  )

I put in a new seal with build but it's a difficult seal to get in square. I'm sure I got it in there without too much ham-fisted-bodge-work but maybe something went wrong.

Stripped it down now, I'll jam in another new seal so fingers crossed..







As an added bonus the rev counter needle starts to boogie wildly after 6k rpm so that's another snag. Then the exhaust seems to spew oil from have a pin hole somewhere.

Temperamental bikes indeed but worth it.

[alverson7]

Lovely bikes indeed . That old tyre tread reminds me of the old BT56 

Those Battlax tires really take me back.  My 91 R model came with those bad dogs and they were so squared off by the time I got the bike in 95 that it was a lazy steering SOB.
I hadn't ridden any other 3XV (or anything that wasn't fecked from years of teenage neglect) and wasn't too hip to how it should feel.  When I put on some new BT90's I almost turned off the inside of every corner for a day!!

Great bikes!  Looking forward to your posts..

josh

[alverson7]

Damn i want that throttle tube 

Get away from that tube!  I want it!! 

josh

[alverson7]

The tube comes with the grip, you can still order it. Theres quite a few other grip part numbers that still come with tube as well ( that i found while searching for the best priced replacement).
It was quite cheap as well.

That's the same tube as the 3XV-26240-00-00 that's NLA?
If so, that's great info.

I just change the grips to TZ grips any way

[alverson7]

Yeah ok, have to backpedal a bit. They are not the same sorry  I only wanted the grip so didn't worry about the tube.

It looks like you should be able to mod either of them to work but you'll lose a bit of leverage due to the hole being closer to the tube..(The ybr one may be a better match with its one hole but the stops might also be an issue) 

Ahh, bollocks!  I'll read further before I comment next time.  Sorry fellas.

[ybk]

The everlasting project...

The SPR holds on to revs randomly which sucks. Did a leak down test with Dan's excellent plugs. Both pots held 6psi for 10min and then some. Forgot to relieve the pressure when I was done. Came back a week later and removed the exhaust plugs with the air bursting out...so pretty airtight haha

Moving on to the carbs then..





Checked the cylinders and saw some unhappy looking nikasil. This is a newly plated cylinder. Anybody have an idea what this is? It's completely smooth, no grooves anywhere. I scraped the right side with a scotchpad and it didn't do much. Amy ideas?

[SeaR1ck]

That looks like poo the plating looks like it's flaking off to me. All those  spots where it's lighter colour then the plating.

I've seen those dark lines before usually right after a fresh replate. Caused because the cylinder was not cleaned throughly. With soap n water after getting them back to get rid of the honing debris. But that mark looks more like a piece of dirt or something dug into the cylinder wall and left that nasty scratch.

They usually don't leave marks you can feel it's visual only. Eventually goes away after you put time on it. If it was just the honing debris. It doesn't look like that to me.

What you got going on looks like a half assed plating job to me. Who did it? Seriously I would be pulling my top ends if I saw that. You can't even see cross hatching going around it uniformly inside the cylinder. For a fresh replate it looks worn out all ready.

Unless it's the picture causing it the lighter spots look like there's no plating. It looks like the bare aluminum. The plating should be the darker colour.

[SeaR1ck]

Showed my friend the pic - he says what plating? It looks worn out all ready.

[ybk]

Yeah I also thought it was flaking off but there's no ridges, completely smooth. It's like the nikasil itself is discolored. The dark line in the middle is also completly smooth, not grooved at all. Very strange.

The plating when I got it back looked fine to be honest. The ring gap was a little tight but that was it. It has less than 200km on it so whatever it is happened pretty quick. Probably plated it with chocolate it seems now..

Replating is such a hit and miss, I've never really had anyone do a good job 

[SeaR1ck]

Powerseal usa did my spr cylinders did a set of nsr cylinders. My friends 2xt cylinders both my yz250 and yz125/144 cylinder. All came back as good as new no issues with them. Definitely look 100 times better than yours.

Yours looks like they were improperly cleaned. So the plating didn't cure take hold properly. I'd be pissed and be trying to get warranty work done from the plater. It looks hella amateurish.

Here's a pic of my spr cylinder right after replate. Your cylinder should still look like this.

[busa1300]

TTW in the UK does plating also...generally just RGV-RS250 cylinders, but will do any (RGV's are at a bit of a discount though).

[ybk]

Finally fixed the holding on to revs issue. Took the carbs apart and squeezed one of the rubber plugs which to my surprise started disintegrating. Must have been drawing in air randomly from there. So pure luck basically.

You cannot view this attachment.

Put everything back and now the float bowls leak, so new seals on order. It never stops 

Now just that erratic rev counter to sort.

Ignoring the cylinder plating issue for now.

[ybk]

Here's a pic of my spr cylinder right after replate. Your cylinder should still look like this.

Man that's a pretty perfect looking cylinder