Gozer's RZ250R

[g0zer]

iv'e also got a spare workshop manual....25 beer tokens

done!

[g0zer]

ok ive checked the compression, its 104PSI in each cylinder hot motor no oil

ive checked the power valves they seem to be adjusted and operating correctly

ive bought a sync tool.. but am too ignorant can't figure out where the hoses are supposed to connect to the carbs

[druu]

I have a carbtune but have never used it with the RGV as the carbs have halfway markings on the mouth so it's just done by eye. Possibly the same with the RZ?

[g0zer]

My moneys on a stuffed powervalve connector leaving the right cylinder powervalve pretty much closed. That would explain why it starts to come on power but then just dies in the arse up top. Like ritza suggested above, pull the caps off both cylinders and make sure both powervalves are turning the full amount at the same time.

when i cycle the ignition, the right cylinder PV thingy doesnt move. the left one is ok though

is 2 wheel wreckers open sunday? hopefully i can pick up another assembly then drop into Jamathis so he can show me how this sucker goes in and out

[Jamathi]

Well looks like you found the problem.
Pretty easy fix.
Unlike me who is now pulling the RZ completely apart looking for the locked part in the gearbox.

[g0zer]

will it damage anything if i ride it around like this (like i have been)?

[Jamathi]

No, it will not damage it, but best is not to pull to many revs due to the imbalance of the 2 cilinders.
It is easy enough to fix and you should do it as soon a s possible!

[g0zer]

thanks mate, regarding the connector and what rz350 was saying about when it fails it munches stuff up.. i guess that means i should buy the entire assembly if i can get one from 2 wheels?

[g0zer]

am hell keen to get this sorted out, the bike pulls pretty hard in the lower gears with only 1 PV working.. should be awesome when both cylinders are running well

i got the BRE9S plugs in too now, which are the recommended plugs for the RZ250R gap is 0.8mm

[g0zer]

i guess its that collar assembly items 40 + 41 that has failed?

is this assembly containing both PV's supposed to slide out as a single piece?

[g0zer]

final note: i have a new neighbour and she is quite cute.

but instead of sitting the the drive working on my sexy R1, i was sitting there blipping this bunky trying to warm it up and filling the suburb with stinking 2 stroke smoke. godamn first impressions gah!

[rz350]

Yay I was right

Each powervalve is 2 halves and come out their respective sides. I dont believe there is anywhere near enough room to get the inner half out without pulling the barrel off, so hopefully for your sake its still in good nick (depending on how long its been like it though its fairly likely at least one of the inner half valves will be screwed as well).

That said, the whole reason the connector gets munched in the first place is the valves start getting sticky (the servo motor is ridiculously powerful and wont stop turning for nothing hence why they get munched). Personally I would rip one barrel off, which will let you take off both powervalves and clean/grease them mate. Otherwise your new coupler you purchase might not last long at all (Ive learnt the hard way). If your careful you might be able to reuse the head gasket, and a new base gasket is only $11 from memory anyway.

BTW the powervalve assemblies are ridiculously priced for what they are. While you dont have much options with the valves themvselves I would recommend you get aftermarket seals to save you some cash (there is 4 of them from memory, and they are a bullshit $20+ each for something the size of a 10c coin.)

Or if you just want to take it for a thrash in the meantime you could always disconnect the powervalves and manually open them both so they are wide open. Absolutely shithouse to ride on the steet like because it will have nothing down low but boy when it hits powerband does it make you grin like a fucking idiot.

EDIT: And yep you are right it is the 40/41 coupler that has failed

[g0zer]

thanks for the heads up in the right direction and the servincing tips man

bloody hell, pull a barrel out? are you sure thats the easiest way? Jamathi said it was easy to fix.. i am thinking what he thinks of as easy is not the same as what i think!

if i am going to start pulling barrels off i may as well pull out my dremel and start a port and polish!

[rz350]

No worries at all mate, good to see more rz's around

You can replace the coupler without pulling off anything (except maybe the radiator depending on how small your hands are). But if the valve halves are even slightly screwed you are wasting your time and cash really IMO, better off pulling it down and doing it properly.

Like I said the valves are probably hell gunked up and need cleaning anyway. Does the right one turn freely if you get some pliers on the end of it (where you took the cover off). If it turns freely you might be in luck. If its stuck solid I would be pulling her down.

[g0zer]

the right one does stutter when being driven, plua the fack that the couple has failed.. i guess they are both beyond sticky as you suggest.

can i just spray WD40 in there and work them back and forth until they loosen up? i then hit it with my magical telfon dry lubricant let it set then hose in some chain lube or something

edit: is that couple actually outside the motor inbetween the barrels? so if i pull the radiator i will have complete access to it? so if i remove that, i will be able to inspect the PV couplings for damage?

edit: why didnt someone tell me about this prime setting on the fuel? its RES PRI and RUN. wah i figured PRI must mean OFF and spilt fuel everywhere last time i took the tank off.. where i am going with this is what the hell is prime used for?

[rz350]

Yeah mate the coupler is between the barrels. One you take it off you can see the see if the valves are damaged.

Haha wd40 and magical teflon powder might be a short term solution, I guess if you are planning on pulling it down in the future it might do the trick for now. You should be planning on pulling it down soon btw to fit 350 barrels. Well worth the upgrade. Keep a look out on ebay us and you might even pick up a set with good condition powervalves in em already.

[g0zer]

i have barfies rims and discs.. getting a quote from 2 wheels for the everything else swingarm rear shock and linkage brake blocks front end incl clipons and master cylinder.. hopefully they will toss in an RZ coupling for me :p

once its handling nice (which is probably going to be a ways away i will start thinking about making the bike nutso i guess

[g0zer]

I have a carbtune but have never used it with the RGV as the carbs have halfway markings on the mouth so it's just done by eye. Possibly the same with the RZ?

im not too sure what you mean? if i pull the airbox and the intake boots so i can see the butterflies and hold WOT they will line up with an alignment mark?

[g0zer]

fit 350 barrels. Well worth the upgrade. Keep a look out on ebay us and you might even pick up a set with good condition powervalves in em already.

oh i see what you mean, if the PV couplings themselves are also damaged then if i look for some 2nd hand 350 barrels i might get the PV with them cheaply.

is it as simple as bolting them up? hmm no it cant be can it? its new pistons as well which then becomes a bottom end rebuild

[sathid]

The 350 PV's don't fit the 250.

The whole top end does tho