bluedog59

What engine ?

Basically it's helping the volume displaced by a falling piston move into the volume created by a rising piston. I think the best people to ask would be those that build race engines where the rules limit what you can do. You're not going to find huge gains but lots of little bits that give you a bhp or 2 soon add up.

Yes, not only in venting but also in aiding airflow below the pistons. Anything that helps more of the power made at the piston crown get to the rear wheel is effectively free bhp.

I don't think it would be difficult to turn up an ali spacer to make it all look tidy.

The only other way I can think of would be to attack the bearing cup with a Dremmel. Once you've got it out it would be worthwhile seeing if you can put a couple of notches in the bearing seat to help next time. BTW, the welding method is equally good, it's more down to what kit you have to hand.

Nice job. Money spent on having your own fizzy tank is always money well spent.

Does it move ok if you have all the bolts and spindles in place but not done up tight ?

A couple of KG off the wheels would certainly be very worthwhile, especially if they're cheap.

I don't know what other stock wheels are lighter but look similar (somebody on here will). It looks like you've got to the point where it's money on fancy materials or cut back on the pies. And maybe a bit of training/exercise to shift the Kilos.

+1 on that. I put a pair of lightweight PVM's in my B12, better handling/agility, acceleration, braking. What do your race regs say about changing them ?

Unfortunately, loosing weight off the rider has some good advantages, 1. It's a lot cheaper. 2. It's easier to loose a worthwhile amount. 3. Loosing weight and being fitter will make you faster ( stamina and concentration ).

Sorry to be the one to ask but, how heavy is the rider ? Often the easiest and cheapest way to lose a few kg.

Irrespective of what standard of bearing you fit, do it properly. Including putting the bearings in a freezer bag in the freezer for a bit and warming the bearing housing in the wheel.

Not over engineered at all, more like doing it properly. They look a nice job so reward yourself with a beer.

The way it worked was that most suspension specialists have a stock of used parts that are in good condition and within spec. If it's possible and they have the bits it's basically a full strip and service then rebuilt with the appropriate bits. In my case, most of my unused bit were within spec and so part exchanged against their bits. The main thing is, ask. It could be just a simple damper rod swap or you may find it's so different it's not viable.

Actually I've had a couple of shocks rebuilt and altered in the past. As long as you have a good shock in the first place that just needs a refresh and is not a real odd ball fitting/spec, it can work out as the cheapest way of getting a near as new shock that fits. It's worth ringing a few specialists but do it before the season finishes or be prepared to wait.

I was only asking. He can put what he wants in there, I was just wondering why ?

As nobody has asked the obvious question. Why do you want to fit such an oversized tyre to a sports bike ?

Performoto ( Mike Tryphonos ) also built some hub centre bikes with either a GSXR 750 or RF900 in. I think one was race at the IOM to a decent result so I would suspect the build quality is good.

PMSL !

Well he was there to go REALLY fast, faster than anybody has ever gone in that class in fact.

I've raced there a few times and a GP125 is probably the best choice.

The problem with the Triumph rear hub is it's 40 spoke and only takes a "dinner plate" disc. Spoke wheels can look Uber cool but can very expensive or slightly less expensive with ingenuity, ability and patience.

Croix on a 1000, I bet the right under the bridge is "interesting".

Looking at the chain run and the position of the gearbox output shafts I would think it's got some form of transfer box to connect them up and raise the gearing.