Operation: RZ350N REVIVAL - Florida 1985 48H Project

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silverstrom
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#376 Post by silverstrom » Sun Aug 09, 2020 11:04 pm

TwoStrokeNut wrote: Sun Aug 09, 2020 6:06 pm
Here are the BR8ES’s that came out. I am holding them respective to the side they came out of with the bike behind them. Again, I’m not a tuner, but it appears the right side cylinder has been running rich. Even when I pulled the bike out of storage and looked in the exhaust ports, I remember the right side having more carbon build-up. Is there any explanation for this?
You can't really read 2 stroke plugs the way you read 4 stroke plugs. It is not a reliable method of evaluating operation and jetting. If you want to know how the jetting is you need to do a plug chop.

One obvious explanation for the right side having more carbon is because it's burning gearbox oil, but I'm sure by now you have pressure tested the cases and checked the cranks seals.

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#377 Post by TwoStrokeNut » Mon Aug 10, 2020 4:09 pm

Well, I DID still detect SOME leakage during my leak-down test, but I attributed it mainly to my makeshift test apparatus. I replaced my crank seals, but I suppose you never know... they could still be leaking. I will keep an eye on it.

One of these days, I will do a plug chop. At least the plugs are extremely easy to get to on this bike.

Thanks for chiming in!
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#378 Post by TwoStrokeNut » Mon Aug 10, 2020 8:41 pm

TEST RIDE!...

Well, it was the moment of truth. I spent 3 evenings after work doing these upgrades and it was time to fire the old girl up again.

I had some premix fuel handy for the yard string trimmer so I put about a half gallon in the tank to run it a bit while verifying the Autolube lines were full. After about 20 kicks (not real happy about that!), she fired up. It didn’t take more than 10 or 15 seconds to ensure Autolube was working fine and I connected those hoses back on the carbs. After another 30 seconds or so of running on both Autolube and premix oil, I drained the premix and filled with straight ethanol-free fuel (that 3-way valve keeps coming in handy!).

Throttle response felt good. After letting it warm up a bit and checking for any leaks, it was time for a test ride. This bike doesn’t run cleanly until the temp gauge needle creeps up to about horizontal in the gauge (not sure if that is normal?) so it took a few laps around my small block in town to warm it up. Neighborhood folks visiting outside stopped talking as I drove by, staring with a puzzled look on their faces. I always wonder what’s going through their heads when they see this bike.

First impressions out on the road are an increased willingness to rev up. It always had that, but now, even more so it seems. In fact, this bike just begs you to do it and it is soooooo fun when revs climb over 6K. I’m not sure what kind of break-in period those poor new rings were expecting, but I’m sorry to say they probably didn’t get treated properly. I soon forgot anything had been replaced it there and was riding it hard. These bikes rev so effortlessly, it doesn’t seem like 9,500rpm could ever hurt it.

Oh yeah, the clutch! Needed to come back to reality and give that a good test too. It had a nice feel pulling away from a stand-still. It still takes very little effort even with the 17% higher pull effort. Upshifting through the gears, I did not detect any slippage… a good sign. I need an open road to really test it though.

It was late and I was getting tired after 6 straight evenings of wrenching on this bike and my old Tiger, so I called it a night… a very successful night it seemed.

Two days later, I was able to take it on a proper long ride to get a better feel for it. Again, it was a little hard to start. I’m not sure if I’m choking it too much or not enough. Once warmed up, it restarts instantly on the first kick. Need to try different things with the starting procedure, I guess.

This ride was pure joy. I’m always amazed at the adrenaline rush you can get from this bike on the pipe. But also equally amazed at how docile and quiet it can be below 5,000rpm. It’s actually very enjoyable to ride slow if you can control yourself to do so. I have a tiny, tiny stumble at maybe 4,000rpm, but not enough to change anything at this point.

The clutch got several good tests with speed shifts between 3rd and 4th without any noticeable slippage. I will consider that one solved!

Its time to park the bike for now so I can give the FJR1300 a valve clearance check. During this COVID thing, the bikes sure are getting some TLC. I wish I could say the same for the classic cars. Maybe soon though if we continue this isolation much longer.
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#379 Post by kobra » Tue Aug 11, 2020 1:27 am

Great to hear it's running good!!! I would definitely agree with your decision to run BR9's. I know there are several people here that say the 8's are perfectly fine, but it says right there in the manual you will have catastrophic engine failure if you run 8's for sustained high RPM's aka highway use. I notice no ill effects of running the 9's except that I can tell they might be on their way to being fouled after about 400 miles. When starting it up cold, the engine is gaining the tendency to do this weird bog thing that is exactly what my old 2-stroke dirtbikes would do when they would foul a plug. Eventually it won't run at all. But hey... they take about 2 minutes to swap out and cost $1.95 each. I'll take that any day over an engine rebuild. Once warmed up, the bike runs perfectly.

I am now running 300 mains and it's great (see my restoration thread for other details). I can hold it wide open at 4000RPM and it runs to 9000 without a single bog, hiccup, or stumble. I was fully expecting 300's to be rich enough to cause a rich rev limit or some sputtering, but I'm not seeing it. Maybe a trip to higher elevation will reveal it.

Let's see some pics when you get it out next time :)

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TwoStrokeNut
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#380 Post by TwoStrokeNut » Wed Aug 12, 2020 8:11 am

400 miles should get me about... let's see, take the number of years past the year 2000 and divide by my age, take the sum of the squares and divide it by the square root of 3 and multiply that by the age of the bike... that works out to exactly 10 years of service... LOL. Hopefully I ride it a little more, now that its running great, but you know, life has a tendency to get in the way sometimes. Yep, extremely easy plug swap and when I bought the latest set, I found a good deal on 4 of them. So 2 of them will be waiting for when I need them 10 years from now. Haha. Seems cheap insurance, even if they need to be replaced every year.

Good to know about the 300 mains. Maybe I will jump straight to them instead of incrementing to the 280's next.

Right, I need more finished pictures, don't I. Let me dig through my files and see if I forgot to post any prior ones.

Thanks for the tips!!
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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TwoStrokeNut
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#381 Post by TwoStrokeNut » Thu Aug 13, 2020 8:31 pm

MY PAIR OF RZ’s...

A couple months ago, I had the Yamahas out for a little exercise and with it being such a nice day, I paired them up for a quick photo shoot. Luckily, “film” doesn’t cost much these days because I snapped a bunch. One of these days, I’m going to clear out the shop so I can get some pictures with my yellow and black cabinets as a backdrop.

Enjoy and thanks for looking!

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Picture 633
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Picture 636
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RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#382 Post by TwoStrokeNut » Thu Aug 20, 2020 6:41 pm

Service E08 - Paint horns...

I don’t remember painting the horns on the first restoration in 2001 and after all these years, they were looking pretty tired.

Picture 638
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The brackets were pretty nasty too.

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Here are the parts, removed from the bike and disassembled.

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I’m not sure what the little tag is for, but at this point, I didn’t want to peel it off or paint on top of it.

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So I opted to tape it off and preserve it. That spot is mostly hidden when installed anyway.

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And here are the brackets with a fresh coat of Dupli-color semi-gloss engine paint.

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Two screws installed and they were back on the bike. I imagine these horns take a pretty good beating since they right up there in the air stream, but hopefully the paint job will last a good amount of years with my infrequent use.

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E08 Total Cost: US$0.00 (just some paint)
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#383 Post by JonW » Thu Aug 20, 2020 8:59 pm

Looks a lot better. good work.

The decals are the horn types, Im sure someone makes a 29L set - these are the LC (4L0) version:

https://yambits.co.uk/rd350lc-horn-decal-p-80670.html

Worth having a look around as im sure someone cam makes them?
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

Like Watches? www.PloProf.com & www.DeskDivers.com

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TwoStrokeNut
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#384 Post by TwoStrokeNut » Wed Aug 26, 2020 8:25 pm

JonW wrote: Thu Aug 20, 2020 8:59 pm Looks a lot better. good work.

The decals are the horn types, Im sure someone makes a 29L set - these are the LC (4L0) version:

https://yambits.co.uk/rd350lc-horn-decal-p-80670.html

Worth having a look around as im sure someone cam makes them?
Thanks Jon!

Hey that's cool... I will add the decal to my next YamBits order. I let the list build up a while before placing an order so the shipping doesn't sting so badly.
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#385 Post by JonW » Thu Aug 27, 2020 8:22 pm

Ask they if you do a 29L version tho, if not someone will do them as everyone does the 4L0 version, and let's face it how hard can it be to print 29L where the 4L0 is!
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

Like Watches? www.PloProf.com & www.DeskDivers.com

MFI
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#386 Post by MFI » Tue Sep 22, 2020 1:30 pm

Wow..reading all this was..great. I owned several ring dings 25 years ago but the RZ was the best..and I want another one. I want a nice running one that I can modify..don't have the time to rebuild one. Mine was suped up as much as possible for street riding. 34 carbs, power jets , stage 2 porting, etc.
good luck with it..

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TwoStrokeNut
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#387 Post by TwoStrokeNut » Mon Sep 28, 2020 2:15 pm

JonW wrote: Thu Aug 27, 2020 8:22 pm Ask they if you do a 29L version tho, if not someone will do them as everyone does the 4L0 version, and let's face it how hard can it be to print 29L where the 4L0 is!
Oops, I answered in such haste, I forgot about the fact that they aren't correct for my bike. LOL Thanks for the reminder!
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

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TwoStrokeNut
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#388 Post by TwoStrokeNut » Mon Sep 28, 2020 2:20 pm

MFI wrote: Tue Sep 22, 2020 1:30 pm Wow..reading all this was..great. I owned several ring dings 25 years ago but the RZ was the best..and I want another one. I want a nice running one that I can modify..don't have the time to rebuild one. Mine was suped up as much as possible for street riding. 34 carbs, power jets , stage 2 porting, etc.
good luck with it..
Thanks. These bikes really get into your soul and I'm soooo glad this one is running again. Don't wait too long to pick up an RZ if you want one... prices are going up and up!

Its time to blow the dust off my H1 and see what it all needs.
RZ project bike links: Operation: MOSQUITO CONTROL BIKE-RZ500 // Operation: RZ350 REVIVAL
'72 H1-500/'75 H1-500/'85 RZ350/'85 RZ500/'01 DR650/'01 Tiger 955/'07 FJR1300

MFI
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#389 Post by MFI » Fri Oct 09, 2020 12:18 pm

Had an H2..gee..wish I kept that one as well..as well as my RD 350 monoshock racer. Man I got rid of some gold...

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Evans Ward
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Re: Operation: RZ350N REVIVAL - Florida 1985 48H Project

#390 Post by Evans Ward » Fri Oct 09, 2020 1:55 pm

Saw some 29L horn stickers on eBay if you are still wanting them.
84 RZ350-Toomeys,SCR milled head, stk 26 carbs,300 M, 35 P, stock regrooved needles AS 2.5 turns out,stk air box,Banshee reeds Zeel non-progr CDI,TSRL Program YPVS,alum rad,R6 shock,GV emulators w/RT springs,fork brace,Shindy steering damper.

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