2 Strokes Down Under

Hey Guys,

Just got my first two-stroke. An '85 RZ250 (supposedly with 350 top end). Nice complete bike. Had a good ride already but I have a few engine issues that will need sorting. As I'm new to these smokers I will need some help to get going in the right direction.

Does anybody know of a mob that is into these kind of bikes in the Shire or at least in Sydney that can help me get this motor sorted?

Cheers,

Rob.

Try here

Castle Hill Motor Cycles 02 9894 8225


Pat.

Ah shit sorry to say think I know that bike did you purchase that near Morriset?

If it is the same one its got crank issues sorry I heard the rumble when I kicked it over,Its also been crashed,

Ant

I'm sure it probably has been crashed, given it's age! I guess that's where the non-original (for Oz according to my limited research?) paint job comes from. One day, when I crash it, I will probably go with a naked style with more upright bars. Probably no need to be all precious about keeping this one stock as it's not a genuine 350.

When I was looking at this one, I almost didn't go for it as I could hear something wasn't right. So, instead I lowballed an offer and paid much less than the ask as I knew I would have to spend a bit to get it running right.

I got Al Mitchell from Kirrawee to overhaul the top end for me. Rebore, Pro-X pistons, 350 carbs, 350 oil pump and billet powervalves from Steve at the TSS, etc. I'm running it in now and it sounds good to my untrained ear - this being my first smoker. The rattle that was in the motor is now gone and it seems to pull pretty good once I have 3000 on the clock. I've only taken it to 7 or 8 so far, but I can feel it start to rip. Hard to override my 4stroke instincts when riding but I will learn! My other bike is a CB1300S and you can ride it quickly ahead of the traffic all day without cracking 3000!

2 questions:

1. Do you stroker guys always guard the clutch?

2. Decelerating and downshifting: any special technique there, as on a stroker the lube comes from the fuel/oil mix and on a closed throttle you're obviously getting a lot less of it. Different technique during break-in or after?

Thanks for any input, and I hope to see other RZ's during my rides around the shire.

Cheers,

Robbo.

Go hard everywhere and you will be ok. Two stroke oil these days is a lot better than years ago so siezures are rare. You need to rev a stroker or else it will run like shit. A lot of people ride around short shifting and with the oil pumps adjusted way too high in a misguided belief that its safer that way when in reality all they are doing is fouling up the plugs and restricting the performance.

Thanks for that EPA. I am pushing it harder with each ride, and as you say, the bike seems to like it and the ride is lots of fun. It's actually quite amazing how these things fly along, I guess part of it is the feeling you get from revving the little bugger.

Question: My bike smokes a fair bit when cold but when warmed up it's nowhere near as smoky. Is that the way it is for these bikes?

Yes that's quite normal.
If you're using the standard oil injection then sometimes they can leak some oil in while it's parked.
Obviously the oil also burns cleaner as the bike warms up.

Ok. Thanks Hybrid.

What's the best type of oil to use for these things?

And, do you guys tend to set the idle RPM high?

A few people are running the previously tut tut no no Castor synthetic oil in their pumps, wouldn't reccommend it in cold climates but has been working very well in warm temps.
THe castor pong makes it all worthwhile

You talking about A747 Lozza?
I used to run it in my oil injected RD with no issues.

What do you mean by setting it high Lowflying?

Setting the idle rpm a bit high. I think the book value is about 1200...

By Castor synthetic do you mean "Castrol"?

Castor means "beaver" in French. As a Canuck I am not against this...

"Castor" is a type of oil.

Made from castor beans.

hybrid wrote:You talking about A747 Lozza?
I used to run it in my oil injected RD with no issues.

Yep and have heard of (my favorite) Agip Kart and Maxima 927 being run in pumps.