r1-z

[eyrey1]

a mate has just bought one and we are trying to find out how they are restricted ?
anyone any experience with these ,
they are new to me but a cracking little bike ,ive told him to join the forum so he will be along soon
thanks in advance

[tzr-v4]

I would say the restrictive points are :
- CDI
- cylinder porting
- pipes

But as engine is almost identical to 1KT/2MA it is easy to find what to do :
- porting (FIII but a little old style so maybe some more modern ones ? an idea Martin77 ?)
- pipes any TZR250 pipes (same idea Martin77)
- CDI ? Maybe TDR250 / TZR250 2XT very rare / Zeeltronic or Ignitech

From memory, R1Z CDI drives the YPVS valves (no external YPBS Box)

[howARD]

Hi Guys, well it's me who has just bought the R1z and would like help or info on how to get the best out of the bike and what modifications i need to make.
Having owned aircooled RD's for the last 20+ years this bike is like nothing else i have had, at first i thought it was awful but after a couple of hundred miles i now really like it , but I did expect a little more performance, there's nothing below 3k and then it's all revs and noise .
I guess it's all standard so it'll be around 45bhp ( it's a really early bike) so what do i need to do to give it a  few more horses, today i have fitted a pair of Nikon end cans that weigh less than half the weight of the standard ones but they don't seem to make any difference , not even any noisier ,i also tried removing the airbox snorkle and jetted up from 240 to 260 mains but just got more induction sound.
It does bog down at very low revs 1.5-3,000 revs sometimes, the pilots are 35, are these too big, are these standard exhausts restricted as they look narrow at the flange.

[tzr-v4]

Hi Japanese market TZR250 2XT has the exhaust restricted with an internal small tube welded into the pipe to reduce diameter.
Maybe the same on the R1Z.

[howARD]

Unfortunately not, I've just had the pipes off and there's nothing in there, it might not be that slow it's just me who hasn't been on a TDR or TZR250 to compare it with.

[Warwick]

A decent stock TZR should whip up to 100 quite briskly, and top out at around 120 on the clock. I think the R1-z is geard a bit shorter though, so maybe top out at about 110-115 or so? 35 pilots sound very big, but I don't know what is stock for the R1-z (I have a TDR myself). Do you know Fredjee from the LC forum? Fred knows his R1-z's so would be a good to catch up with.  For tuning and stuff, Martin77 is a whiz with the old 2MA/1KT engines.

[howARD]

Don't know any of these guys yet but I'll see if i can find them, my bike does get to 100mph easy but there's not much left maybe another 10mph but the needles would be off both clocks.

What size pilots do TDR's run ? the R1z does have smaller carbs , they us 28mm compared to your 30mm's so it might be worth me looking for some bigger carbs.

[maccas]

Don't r1z's use the same carbs as the 2ma and tdr? If they are 28mm then they are the same as the 2ma/tdr. 28mm is plenty big enough to make decent power. The cdi/pv controller might be the issue as might the design of the standard pipes. Id try and see what the cdi looks li ke and whether  it is one box for both cdi and pv or separate boxes for each. You might be able to fit a csi and pv controller from a 2ma or a combined cdi and pv controller from a tdr.

I don't think the porting will be restrictive so i wouldn't worry about that.

Dan

[howARD]

The box looks like it's one unit for PV and CDi unit, I have looked at other Cdi's on ebay and mine has twice as many wires to/from it.
The exhausts could be an issue as i fitted the Nikon end cans and they sound and perform just the same as the standard ones, they're not that heavy though but the flange is narrow.

[Tom Mac]

Standard pilot jets in an R1Z are 12.5s
standard R1z gearing is short, they run a close ratio gearbox compared to the TZR and TDR with a high first and low sixth and then a 45t rear sprocket.
R1Z carbs are 26mm compared to the 28mm ones fitted to the TDR and TZR.

If you want it to go faster, find a set of TZR carbs, fit some aftermaket pipes (martin 77 ones would suit the look ot the R1z well in my humble opinion) and then fit a 41t rear sprocket.

[howARD]

Cheers Tom Mac that's just the answer I have been waiting for, as you can tell I'm not very clued up on these bikes but I was on the right road , so now i need some carbs, guess I'll need the inlet stubs and maybe the airbox rubbers, and I'll see about the pipes and sprocket.

[Tom Mac]

Nope you'll just need the carbs, The airbox rubbers and inlet stubs are the same as the TZR250 2MA/1KT ones.

[howARD]

That's good news then as I have just bought a pair of TDR250 carbs on ebay so carn't wait to try these when they come.

[eyrey1]

howard /ste just message martin77 on here mate ,good lad ,good prices !
i will be giving him some stuff to do in a couple of months

[howARD]

I have spoken to Martin regarding the pipes, I'm going to give the carbs a go first see what results I get from them, I don't want this bike to be a money pit , not yet anyway knowing me I'll move it on in a few weeks, usually once I get them sorted I get bored .