Ke125

[chrisc]

Didn't think they produced a non-performance/racing 94cc kit?
Don't mind me, I just think this entire derbi bigbore route really is a piss take (and so very grey under the current rules) given the endless fuss about MX85 motors....

There is a road version of many cylinders where the ports aren't quite as advanced and they come with 2 ring pistons etc for the road. They're by no means an old, crappy design but they're certainly not the race cylinders everyone imagines when you hear "aftermarket Derbi cylinder". I did a bit of research into this area before I bought a RS125 and everything became irrelevant.

A KE/derbi cylinder engine is far from the MX85 argument too. Although Kel would no doubt absolutely destroy me on a RS/KE/derbi, I personally wouldn't have a problem with it given how much effort is required, which makes buckets so much fun.

[kel]

They're by no means an old, crappy design but they're certainly not the race cylinders everyone imagines when you hear "aftermarket Derbi cylinder".

yeah nah

Just about as hot as it gets, but its made for a road going Derbi motor.

[jasonu]

yeah nah

Just about as hot as it gets, but its made for a road going Derbi motor.

That cylinder looks the tits!!!!! How much trouble is it to fit to the KE cases compared to fitting the RG cylinder?

[kel]

That cylinder looks the tits!!!!! How much trouble is it to fit to the KE cases compared to fitting the RG cylinder?

About the same. Fill existing stud holes, add some metal for new mounts, finish off with lots of epoxy.
I cheated on my KE/RG cases and offset the cylinder so I could use the existing rear studs. Asymetrical port timing but at least it's centred

[F5 Dave]

What sort of stroke do the run & vs the KE can you get it to 100 or even under 104?


Heck lets all run those barrels on MX85 bottom ends change the rules I'm keen, the 4 stroke lads will all be on destroked KTM200s soon enough.

[F5 Dave]

"If you're looking for ultimate performance, we've got something for you: Bidalot 94cc Tuning Kit Factory 2014 (cylinder kit + crankshaft) Derbi Euro 2.This tuning/racing kit includes a Nikasil-plated aluminium cylinder with 6 transfer ports and divided bridged exhaust port which was modified for this 2014 version. Moreover, it includes a high-end racing crankshaft (48mm stroke / 95mm connecting rod). Also included are a high-compression modular cylinder head, a single-ring piston (d=50mm / 13mm pin) and a 4mm cylinder spacer.
The crankshaft is a top quality racing crankshaft with 48mm stroke (note: 95mm conrod, 25mm main bearing + small end bearing 13x17x17.5mm) which, in combination with the 50mm piston, will result in exactly 94cc displacement.
With plenty of torque and plenty of power throughout the entire rpm range, this 94cc Hyper Racing kit is one of the most powerful kits on the market for this type of engine and displacement. Its versatility and high quality workmanship make it the perfect kit for track as well as for drag racing."

Sweet, that looks legal but I can't afford the 700 Euro.

[kel]

What sort of stroke do the run & vs the KE can you get it to 100 or even under 104?

48mm stroke, 50mm bore. I'd take it out to the KE's 50.6mm stroke, port timing wont be perfect but it will still be a reliable rocket with a steady supply of parts.
And to cover the next question, the piston skirt is 51mm long.
Bingo Dave, 360 euro without the crank. they even offer a twin cylinder version!

[chrisc]

yeah nah

Haha, yeah I was clearly looking at a different cylinder previously

[Bert]

Yip all the posts above just make me think that the two stroke Rules just about need a rethink...

I wander if I could adapt one of those for my TZR... Really can't see it being difficult other than the little end bearing size...

300hp/l here I come

Just got to ride the thing.

[kel]

Yip all the posts above just make me think that the two stroke Rules just about need a rethink...

I wander if I could adapt one of those for my TZR... Really can't see it being difficult other than the little end bearing size...

Its too late, the Derbi after market kit motors are popping up in TZ chassis and the like. True cheque book racing, just bolt up and go.

Two options for the little end. 1. buy the aftermarket euro 2 rod and install to your crank or 2. Simonini do the same piston but with 14mm pin, plenty of rod options at that size
300hp the dyno graph they sent only shows 32hp.
edit: oh, 300hp/l sorry missed that

[Bert]

Its too late, the Derbi after market kit motors are popping up in TZ chassis and the like. True cheque book racing, just bolt up and go.

Two options for the little end. 1. buy the aftermarket euro 2 rod and install to your crank or 2. Simonini do the same piston but with 14mm pin, plenty of rod options at that size

True but I think we all agree it some some skill to really get big numbers out of them.
But <24 could be achievable to a complete noddy by bolting things together.

[jasonu]

True but I think we all agree it some some skill to really get big numbers out of them.
But <24 could be achievable to a complete noddy by bolting things together.

I think a good reliable 2t with a rideable 24hp in a decent light weight modern (RS or TZ or Griffiths) chassis with a decent rider would easily do the business.

[Bert]

I think a good reliable 2t with a rideable 24hp in a decent light weight modern (RS or TZ or Griffiths) chassis with a decent rider would easily do the business.

You'd also think the a good reliable 4t with 24hp in a decent chassis would also do the business... But... I'm proof that's it's still the rider that has to put it together....

[F5 Dave]

I think a good reliable 2t with a rideable 24hp in a decent light weight modern (RS or TZ or Griffiths) chassis with a decent rider would easily do the business.

What a Stella prediction. . if it hadn't happened the last 2 GPs

[jasonu]

What a Stella prediction. . if it hadn't happened the last 2 GPs

Point (previously) proven...