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Hi I'm in Pensford, just south of Bristol. I did hook the seal out, but there was nothing wrong with the seal which was genuine Yamaha. The ground section of the camshaft where it runs was pretty rough. My guess is that sometime in the past it was starved of oil or didn't have good oil or...

Hi, I haven't done a compression test yet as it's with the owner currently, though when I fit the non-return valve (I found a nice stainless one on flea bay) I will do one. I'm hoping it's OK, but considering how well it pulled I doubt that is the problem. I did use Wellseal on the head...

Thanks for your reply Peanut. I have now measured the guys dip stick and it appears to be the correct one. Whilst I haven't seen a later breather, I already binned the twin spigot bit in favour of a single spigot I machined myself, as the way the engine fitted in the frame there wasn't room for...

Hi I want to fit a Heiden Tuning crank ignition system on a client's engine, because there bearing part of his camshaft is worn and is leaking oil profusely, despite brand new seals. As getting a new cam is a no no and in a chop frame it's an engine out job to even try another second hand...

I am working on a chaps XS650 engined ('75) chopper. It has an unholy oil leak from the end of the camshaft, behind the Boyer ignition pick ups. On closer examination I think that there is excessive wear on the cam shaft where the oil seal lips meet. When looking to see if I could find a new...

Earlier this year I rebuilt an XS650 motor for a customer that had undergone a whole heap of unkindness in it's long life. I replaced all the oil seals, gaskets, 'o' rings etc with new and all gaskets were seals with Wellseal It's now out to fourth oversize and pulls really well with bags o...

Hi Jay I whizzed past Brent Knoll day before yesterday when I was out on my Rex wasting fuel for the shear joy of it :) Have a great new year :)

Many thanks Bob. That is the company I bought the pistons from. They seems very good. I shall send them an e-mail asking if they can supply the correct pistons for the engine I'm working on. I'm guessing the 553 reference is the beginning of the part number? Many thanks Ralph

Hi Bob That sounds great. Could you please check the link as my iPad won't open it. Many thanks, Ralph

OMG - what a can of worms :( I had no idea that the engines had so many different rods. The advert on e-bay, with a Japanese company I've bought lots of Kawasaki bits from before, said '74-'76 1.00mm oversize and I thought what a result. I didn't see any mention of this issue in the workshop...

Is there more than type of piston used on the XS650 ? I'm rebuilding a very tired XS650 lump. I bought a pair of +1.00mm pistons and had the tired old barrels re bored to fit. Imagine how VPO I felt when, having fitted the barrels, I wound the crank round to TDC and the top rings popped out...

Thanx for looking Gary. The. Choice seems to be 20 or 25mm width, so I'll play safe and go for 20mm. So far the best price offered by a local supplier is £25 plus VAT beast's pound of flesh, but I'm waiting for simply Bearings to get back to me as whilst they list them, they don't have stock...

This set of casings was vapour blasted and then given a ceramic treatment, which gives a fantastic as new finish. The guy who does the treatment in the UK is Steve Smethurst, and he guarantees no beads left. You can't say fairer than that. :) Apparently the finish is much less prone to getting...

Ahh, now I would really like to hear about the shimming of the taper needle. My 13 runs lovely, apart from that annoying stutter. According to the man at the dyno it was most likely that he pilot screw needed opening up a bit, but as it was already 3 1/2 turns out I needed to fit some even...

Hi Peanut Wow you're also from Somerset!!!! I have a a trade account with Foulups, so I sussed out the part numbers and dialled it in to their on-line parts thang and it said it was discontinued, which is why I'm trying to find the bearing dims. I tend to go to Simply Bearings as my first...

Thanx I ditched the mixture of crap coils she came with and replaced them with the Dyna compact coils. It was a right royal pain in the grinner to fit them, but some succinct engineering got them nicely in place and they're doing the business. The carbs have been a bit challenging to say...

Hi Gary Over here they're called Z1300s. I have wanted one for the last 31years since I first saw one and earlier this year I thought I had best get one whilst I'm still fit enough to ride one. I took her to the Isle of Man for the Manx Grand Prix fortnight and clocked up some serious...

The gear selector drum of this engine I'm trying to build, has knackered bearings ... in a big way. The needle roller at the back came out in about fifty million pieces. I have found a part number, but the UK suppliers come up with a blank. I can easily measure the inside and outside diameters...

Thanks. That was really helpful :)

Hi as I mentioned in an earlier thread, I am restoring an XS650 engine that has been the victim of some serious abuse. There are a number of holes in the top crankcase that look as if they have been filled with an epoxy putty and I'm wondering if they should have been. I have taken a few pix...