Suzuki GP125 ignition and other bits

[TZ350]

http://www.trademe.co.nz/Trade-Me-Mo...-372316613.htm

you need this if you want 18+hp (and to read the E.S.E thread)

Modify them as per page 200 and you can have 22+rwhp.

[cotswold]

http://www.trademe.co.nz/Trade-Me-Mo...-372316613.htm

you need this if you want 18+hp (and to read the E.S.E thread)

I have a 1996 RS125 pipe hanging from my garage wall and was hoping it would be a good place to start, but thanks for that.

http://www.flickr.com/photos/timcoop...in/photostream

[TZ350]

I have a 1996 RS125 pipe hanging from my garage wall and was hoping it would be a good place to start

It should be good, but it might need some modification to get it to fit.



I have had a lot of success with an early model Honda RS125 Pipe, it was fairly easy to fit. A little modification to the header flange and cut and turn the midsection. I left the GP's port at 36mm, the pipe is 40mm, the resulting step was intentional.

[ac3_snow]

I notice the rubber spigot you use to mount your carb in that picture, is that a standard GP125 piece (or similar to it) or did you need a bigger rubber mount to fit the flat-slide carb?

[cotswold]

I notice the rubber spigot you use to mount your carb in that picture, is that a standard GP125 piece (or similar to it) or did you need a bigger rubber mount to fit the flat-slide carb?

You will have to ask mr. TZ that one and I will be interested in the answer also

[TZ350]

No not original GP, the Keihin or OKO 24 uses a slightly bigger manifold, I just lucked onto this one and have been looking for some more and was hoping these might fit. http://www.alexwarehouse.com/okovm26...dapt_p330.html

[ac3_snow]

was hoping these might fit.

ditto although at this stage I'l be pretty happy if they just turn up!

[Bert]

I notice the rubber spigot you use to mount your carb in that picture, is that a standard GP125 piece (or similar to it) or did you need a bigger rubber mount to fit the flat-slide carb?

or you could try a Gsx400 spigot, common as (most wreakers will have a few) and will fit these larger carbs nicely.

Has anyone had luck with Alexwarehouse and not had to pay the stupid extra low volume fees???

[cotswold]

Just bought this lot sight unseen so hopefully some useful parts amongst the landfill

[Slingshot]

Just bought this lot sight unseen so hopefully some useful parts amongst the landfill

Lucky you - I was hoping to get the barrels & heads...but he would sell them separately

[cotswold]

Can any one tell me how come the one in the middle is different, is it from an earlier model or a different bike?

[TZ350]

Can any one tell me how come the one in the middle is different, is it from an earlier model or a different bike?

Same bike, different year, some of our bikes came with the smaller head, we prefer to use the bigger ones for their extra thermal capacity.

The funny thing about air cooling is that it is more efficient when run hotter as there is a greater thermal loss from a hotter surface than a cooler one.

But there is a difference between rejecting waste heat efficiently and cooling capacity, this run it hot sort of efficiency is not much use to a racing engine that needs to be kept cool so it doesn't lose power.

I think both the 100 and 125 use the same cylinder head casting but more of the gasket face is machined away to make a smaller combustion chamber for the 100.

All the GP100/125 cylinders look the same, but I suspect there might be some differences in port timing. A 56mm cylinder is for 125's and 50mm for 100's.

The cylinders are directly interchangeable as the cranks and cases are the same, the only other engine difference is in the rotary valve timing, rotary valve cover and carb. A 100 cylinder can't be bored out to 125 as the liner is wasted and breaks through.

[F5 Dave]

It really is quite incredible that teh japs spent the money on different castings, - heck I wouldn't have bothered. Maybe they thought it was a crucial styling update.