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Offline ford832

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RZ 350 riddle
« on: January 24, 2011, 03:55:36 AM »
Ok, a little background first.
Way back when I bought a new RZ.For those that don't know,it's a 2t twin street bike with dual carbs.It's one downside was a lack of range(about 110 km)and,having an urge to do a little traveling,I sold it and bought a 750 Interceptor.
After I got that out of my system,I had an urge for another RZ and found a used one for sale with a freshly rebuilt engine for a super good deal.Usually,that would set the alarm bells ringing but the guy had taken the engine out and sent it to the shop I buy my parts from so I had no doubt the rebuild was done correctly.
Upon arrival,I checked it over then snapped the choke on and it started first kick.Given that the price was about half what it should be,I took a chance and bought it.
On the way home,it was running so super rich it wanted to stall at anything under about 1/3 throttle so I had to pull the clutch in and keep the revs up just to keep it going.
Above that throttle opening,it would go like a scalded cat.
Once I got home, the solution came after about ten minutes of sitting on the step slurping a brew and staring at it(beer = brain power)
Once fixed,it then created another problem that I'll get into later if anyone gets this.
Both fixes came quickly but in truth,only because I was intimately familiar with the RZ's set up due to my first one.Had this not been the case,it would have been much more of a head scratcher.
Anyone..........
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline mj4trax

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Re: RZ 350 riddle
« Reply #1 on: January 24, 2011, 04:57:59 AM »
If my memory serves me correctly, the carbs and motor from that RZ350 is essentially (or very close/similar to) the powerplant Yamaha used in their Banshee quad (from '87-2006).  I know the Banshee is a liquid cooled motor. ..   is the RZ liquid or air cooled?  Did it have oil injection or run on premix? 

2003 RM250
2004 RM250
2001 yz125
1986 trx310R
1989 trx250R

Offline ford832

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Re: RZ 350 riddle
« Reply #2 on: January 24, 2011, 05:02:36 AM »
You're right.Basically the RZ and Banshee engines are clones-for the most part anyway.Liquid cooled,oil injection.
It looks like this......



Damn,I miss my RZ's  :(
« Last Edit: January 24, 2011, 05:08:25 AM by ford832 »
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline mj4trax

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Re: RZ 350 riddle
« Reply #3 on: January 24, 2011, 05:52:59 AM »
Seeing how those cylinders would have head gaskets rather than O-rings, it seems possible there could have been a coolant leak. ..   I've had that before on my TRX and it made the bottom end feel boggy. . .   once it got screaming up top it burned right through though. .   

That's my "shot-in-the-dark" guess since I'm figuring that the obvious (simple jetting issues) weren't the problem (otherwise this wouldn't be much of a riddle) 
2003 RM250
2004 RM250
2001 yz125
1986 trx310R
1989 trx250R

Offline ford832

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Re: RZ 350 riddle
« Reply #4 on: January 24, 2011, 06:19:13 AM »
Nope,no engine issues whatsoever and I never had to rejet-well,not really anyway as I never changed any brass.
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline MyckMcClung

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Re: RZ 350 riddle
« Reply #5 on: January 24, 2011, 06:26:47 AM »
the pilot jet was gummed up, the air filter was dirty, or there was a rag in the boot?
If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline ford832

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Re: RZ 350 riddle
« Reply #6 on: January 24, 2011, 06:38:45 AM »
None of the above....
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline MyckMcClung

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Re: RZ 350 riddle
« Reply #7 on: January 24, 2011, 06:40:10 AM »
rat nest in the pipe
If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline eprovenzano

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Re: RZ 350 riddle
« Reply #8 on: January 24, 2011, 06:51:19 AM »
Moved the clip to lean her out a little more?
Eric Provenzano
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Offline mullethead774

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Re: RZ 350 riddle
« Reply #9 on: January 24, 2011, 06:59:00 AM »
Adjusted the oil pump, switched to the correct oil, untangled the cable for the injector,......?
2 strokes & mullets forever

Offline ford832

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Re: RZ 350 riddle
« Reply #10 on: January 24, 2011, 07:27:03 AM »
Nope,nope and nope......
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline Coop

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Re: RZ 350 riddle
« Reply #11 on: January 24, 2011, 07:43:49 AM »
I say you forgot to shut the choke after starting it  :)
- Mike - Don't take life so seriously, nobody gets out alive.

Offline ford832

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Re: RZ 350 riddle
« Reply #12 on: January 24, 2011, 08:31:19 AM »
Oddly enough,given my addle-mindedness-no.However,it ran just like that only I would say even richer/worse.
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline MyckMcClung

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Re: RZ 350 riddle
« Reply #13 on: January 24, 2011, 09:47:10 AM »
the main jet came unscrewed
If a pair of 2" brass balls isn't working, I doubt that the 3" model will make much difference.

Offline ford832

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Re: RZ 350 riddle
« Reply #14 on: January 24, 2011, 11:04:12 AM »
No,not brass related.
I'd rather a full bottle in front of me than a full frontal lobotomy.