I killed Elsie

[Skunk]

The R in the plug name means resistor. cant use resistored plugs on 2 strokes.

Yeah, I know.

[dangerous]

The R in the plug name means resistor. cant use resistored plugs on 2 strokes.

yes you can ya wally... as long as the plug cap isent resistered, you can have one or the other

[Ixion]

This is not going to help,but I thought these things were "unkillable".Had one for 18 months and tried.Had some issues with the waterpump(put water in it)but hell,what a reliable bike.Great to see some people keeping them going.Air cooled bikes I spent hundreds on before "learning"

Tell that to my battered arzhole

Two strokes. It's what they do. Is why we luvs them so

[gijoe1313]

Pitter pat goes my heart ... was such a warming sight to see when I rode Daisy and zeo was on Betsy today!

Hrumm ... I hope Elsie is coming along ... better get off my chuff and get on with Daphne and Dandi!

[TygerTung]

Then why is the factory specified plug for my RZ350 a BR9ES?

[dangerous]

Then why is the factory specified plug for my RZ350 a BR9ES?

because the factory specified pulg cap... dont have a resister

[Forest]

Tell that to my battered arzhole

Two strokes. It's what they do. Is why we luvs them so

Offerings to the God of Speed.

[stanko]

because the factory specified pulg cap... dont have a resister

Its actually because without the resistor the electrical interference would mess with the powervalve controller

[F5 Dave]

Well Skidmark shows his usual lack of knowledge "cant use resistored plugs on 2 strokes" Pah! Usually all caps are resistored these days (post 70s) to suppress RF noise which interferes with radios etc & was concern with YPVS box on the later RZs. I truly believe the RZs & most Yams of the vintage (so likely the RDs) had resistor type caps. Many will have come out with resistor plugs as well to cope with more severe markets. These arew usually replaced with non resistor types with no consequence.

Had a Taxi driver virtually run me off the road many years ago screaming about plugcaps and how my bike was interfering with his radio.

Either way you should be fine with decent resistor caps, I like the NGK marine rubber ones as they cope with the vibration well & stay clipped on hard as well as being a good weather seal. I wouldn't worry with resistored plugs but wouldn't expect a deteriation in performance either except perhaps on a race bike. Maybe.

[dangerous]

Its actually because without the resistor the electrical interference would mess with the powervalve controller

LMFAO... come on now even I know the power valve is a mechanically operated item, and I have been warned about resestered plugs and caps on the RD (pre PV)

[Ixion]

The powervalve is mechanically operated by a cable drive. The cables are controlled by an electronic box full of tiny little imps. RF gives the female imps headaches. They then refuse to put out for the male imps, who then get throughly tense and pissed off, and will start randomly tugging on everything in sight, including the power valve cables. So, it is possible that a non resistance spark plug/cap could generate enough RF interference to upset the PV controller. I've not heard of it happening, but that's not to say it couldn't

[dangerous]

The powervalve is mechanically operated by a cable drive. The cables are controlled by an electronic box full of tiny little imps. RF gives the female imps headaches. They then refuse to put out for the male imps, who then get throughly tense and pissed off, and will start randomly tugging on everything in sight, including the power valve cables. So, it is possible that a non resistance spark plug/cap could generate enough RF interference to upset the PV controller. I've not heard of it happening, but that's not to say it couldn't

imps... i had a imp once bloody thing ran like a haunted shit house, and even with the back window open it was bloody hard to get a half decent root in it... look I know they are a small car but surley ya cant get one in a PV control box? ohhhhhhhhhhhhhhhh, you mean that Yamaha stole all the pixies from the front garden and stuck em in the we yamy box...

[Spyke]

man there's so much knowledge in here. I wish I could harness it and use it all. lol especially the engine rebuilding stuff.

[F5 Dave]

LMFAO... come on now even I know the power valve is a mechanically operated item,. . .

As said the PV is mechanical, but the controller on the RZs & TZs is by electric servo motor in turn controlled by an electronic box which takes it's lead from the CDI when to operate.

On MX bikes they are entirely mechanical as the valve is opened by a centrifugal device that typically pushes ball bearings outward forcing plates apart turning a shaft or lever.

[Skunk]

They will fit with a bit of modification, if I remember rightly the cranks are slightly wider, so you either have to machine the cases or machine the crank webs so it will slot in

I've (OK, Sketchy Racer has) pulled apart the TZR bottom end I have and compared it to the RD crank.

There is no way, with any amount of machining, that that crank will ever come close to fitting.

The nearest measurement is the rod ends (17mm vs 18mm). Web to web is nearly 140mm different.

It must be the RZ/powervalve models that are similar to the TZR. May this be of help to everybody else who needs this info.