Bucket update

[Ivan]

So lets start at the start. They are RS50 forks yeah? & have RS springs yeah?

OK so the engine will be how much heavier than std I wonder? Take the valve springs out. Check static sag & race sag (search on internet). This should start to tell you if you need stiffer springs. Ideally you then measure what you have. Add preload as required to get sag right, but it never makes up for springs that are too soft.

Swapping springs has to be done with some care. I've shortened spring successfully (to stiffen the rate and then replaced the lost length with spacers) but you need some care to get them both the same, both flat & not coil binding.

Yip they are Standered RS forks.. and RS springs.

[quallman1234]

http://www.apriliaforum.com/techtips/rs50/fork.htm

Using that guide. I measured the static front sag @ 15-16mm .
And the max travel with all my weight plus some more forcing on the front was 50mm.

Obviously im going to take the valve springs out and put fresh oil in them.
But what kind of sag should i aim for?

dampening seems fine at this moment.

I actually think the stock engine was quite far forward. Hence i might get away with the stock springs and a heavier work oil.

[F5 Dave]

10 weight is the most you should use lest they lock on highspeed bumps. The AX engine & RS engine may be similar, the RS barrels are pretty heavy. Try it & see without the valve springs.

[quallman1234]

10 weight is the most you should use lest they lock on highspeed bumps. The AX engine & RS engine may be similar, the RS barrels are pretty heavy. Try it & see without the valve springs.

The RS is watercooled and the AX is not so that could make it about even.

[quallman1234]

Took em out.

30-35mm of sag now. Good dampering. Haven't moved the forks down in the triple clamp yet.

Hmm odd ball sized valve springs as well couldn't help. So basically its running a standard front end now. What's good since it seems to work ok .

[Skunk]

Hmm odd ball sized valve springs as well couldn't help. So basically its running a standard front end now. What's good since it seems to work ok .

Another wonder of Ivan Engineering...

[quallman1234]

Another wonder of Ivan Engineering...

You live and ya learn.

Give him a break its his birthday

[Skunk]

It is too!

Suppose he will learn one day. But not when he doesn't take advise that is given to help him.

[Ivan]

Lol wow I dont remember them being differnt me and my mate Jamee did them maybe I might push the blame tohim

[quallman1234]

Lol wow I dont remember them being differnt me and my mate Jamee did them maybe I might push the blame tohim

Yeah man. Its not so much the difference's in lengths what's surpising but the difference's in width's!
Im painting the seat unit mack black again tommorow . Have to make a new flange for the expansion chamber.

[Ivan]

Sweet yeah she pretty much sanded back aye.

I scuffedthe paint you just using matt black cans it was gloss black but i sanded it

[gav]

Any reason why you are choosing an AX100 engine?

[Ivan]

Probly cause it was the engine allready in bike when he got it off me

[quallman1234]

Any reason why you are choosing an AX100 engine?

Might be tempted to buy a loncin 150cc single later on. Depending on stuff.

Skunk's AX100 engine is really fast! So i don't see why this still can't be a winner. - Mind over matter.

[speedpro]

Has anyone else noticed that a MB100 engine bolts directly into a FZR250(3LN) chassis? I only have a 2KR rear wheel fitted at the moment but it looks to be only a matter of loosening off one allen key and sliding one spacer over a bit to get the sprockets to line up. Both rear engine bolts go straight through and it looks "more-or-less" right as far as sprocket alignment. I can lower it a bit more yet and I'm still tossing up about shortening the wheelbase. The FZR is about 200mm longer than my RG/MB and 100mm longer than a Honda RS125. Once I got all the steel subframes off the thing is not looking toooooo heavy. Actually I'll add about 20mm spacers to the bottom mount to get the motor attitude right.

Dyno'd my bucket at work the other day, just to see. It made 21.7hp, a drop of only .8 or so over quite a few years with still the same motor bits though I do vaguely recall changing the ring years ago.