kobra's 1985 RZ350NC2 basket case restoration

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#166 Post by kobra » Fri Jan 04, 2019 9:27 pm

brrrappp wrote: Fri Jan 04, 2019 9:26 pm The shims are nothing special. I'm pretty sure they are supposed to quell brake "Squeal"

The brake pad holding pins- there should be two (2) and they are kept in place by very small hitch pins that have a 90 degree bend at the top.
Ahh I see. I guess I will keep the shims and put them in later if I get squealing hehe.

I am thinking of replacing the pad holding pins with a couple of these:
Image

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#167 Post by kobra » Sat Jan 05, 2019 5:07 pm

Another question...

My stock bars are rusty and might be slightly bent. I'm looking for an aftermarket that will be similar, maybe a little more rise and width compared to stock. I really like the way these look:
Image

Does anyone know what model these are, if this guy is a forum member here so I can find out, or what might be similar?

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#168 Post by kobra » Sat Jan 05, 2019 11:12 pm

Anyway, got the front calipers built up. Went smoothly with no hangups.

Before and after shots... the left caliper had to be replaced as the caliper seal grooves were pitted beyond repair. The right caliper somehow fared much better and polished right up. I am guessing due to water pooling more on the left side. I found a replacement from a 1983 Virago.

Image

Image

Here are the new parts.
Calipers blasted and painted gloss black.
Mounting brackets blasted and painted flat black.
Pistons painted inside to prevent corrosion.
New seals from BrakeCrafters (Made in Japan) including bleeder nipples and caps.
Rubber boots were still in perfect shape.
Vesrah VD235JL brake pads - my favorite brand of sintered brake pads.

Image

Image

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brrrappp
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Re: kobra's 1985 RZ350NC2 basket case restoration

#169 Post by brrrappp » Sun Jan 06, 2019 1:58 am

They look as good or better than new!

Great work.

To me the handlebars look like Renthal

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Zedixe13
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Re: kobra's 1985 RZ350NC2 basket case restoration

#170 Post by Zedixe13 » Sun Jan 06, 2019 2:50 am

How come your original piston is not stainless steel ?

brrrappp
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Re: kobra's 1985 RZ350NC2 basket case restoration

#171 Post by brrrappp » Sun Jan 06, 2019 3:08 am

Zedixe13 wrote: Sun Jan 06, 2019 2:50 am How come your original piston is not stainless steel ?
The cheapo stainless used by the japs for caliper pistons does rust in the unpolished hollow area that faces the brake pad. It doesn't matter but it looks like crap when you are working on them. The area exposed to brake dust dirt etc usually cleans up unless it was nicked. If the polished surface get nicked it will rust as well. Much like a fork tube.
Last edited by brrrappp on Sun Jan 06, 2019 3:11 am, edited 1 time in total.

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#172 Post by kobra » Sun Jan 06, 2019 3:11 am

brrrappp wrote: Sun Jan 06, 2019 1:58 am They look as good or better than new!

Great work.

To me the handlebars look like Renthal
Thanks! Yeah they are Renthals but I can't tell which model. They make like 7 or 8 different street versions: Ultra Low, Low, Medium, High, and a few more. Guess I can try to measure the originals to get close.
Zedixe13 wrote: Sun Jan 06, 2019 2:50 am How come your original piston is not stainless steel ?
I'm not sure - maybe that was a Canada only thing because they had 2-piston calipers? These appear to be chrome plated steel and get rusted out very easily.

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Re: kobra's 1985 RZ350NC2 basket case restoration

#173 Post by brrrappp » Sun Jan 06, 2019 3:13 am

The bars in the picture look like a low bend. The stock bar would likely be a medium bend.

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#174 Post by kobra » Sun Jan 06, 2019 3:39 am

More carburetor input needed...

Okay guys I am having a helluva time figuring out my carb situation. From what I can gather, assuming my jets aren't corroded, the only consumables are the fuel lines, top/bottom gaskets, and float valve/seat, right? Stock CA jetting is a 20 pilot and 230 main, which I plan to bump up to 25 pilot and 240 or 260 main due to the new DG pipes and no baffle in the airbox. Does that sound right so far?

The issue is finding the right combination of parts that fit. The carb I believe is called the VM26SS but we have a 3-bolt top cap versus a threaded top cap like most VM26's. So the Sudco and Mikuni rebuild kits aren't right. it doesn't even look like the Keyster kit from Economy Cycle is right since it has a round top gasket. The closest I've found is the one from HVCCycle: https://hvccycle.net/yamaha-carb-repair ... 350-83-85/ but it seems minimal for $46. Shouldn't there be an air screw as well? I read something about the air screw being non-adjustable, but that's how you would need to balance the carbs no? The kit from Economy cycle looks like it has twice as many parts. https://www.economycycle.com/shop/yamah ... an-models/

I've been recommended a Dynojet kit also but don't really fancy another $65 if I can just buy a $3 main jet that does the same job. Kinda at a loss what the best route here is for a quality refresh without breaking the budget. Find a kit? Buy individual parts? Thank you all again!

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Re: kobra's 1985 RZ350NC2 basket case restoration

#175 Post by AlexG » Sun Jan 06, 2019 10:46 am

Do you need those extra parts? Plus, the top slide cap gasket is round vs the three screw model on some RZ bikes; mine included.

Also, the air screws were not the same as the ones I had.

In the end, main jet, needle, and float valve are all you need. I like the 7 extra screws included on the HV kit as well.


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waltmil
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Re: kobra's 1985 RZ350NC2 basket case restoration

#176 Post by waltmil » Sun Jan 06, 2019 1:01 pm

HVC also has air screws but they didn't come with springs or o-rings. Pricey at $28 US but the heads on mine were apparently damaged when the blocking plugs were drilled out.
Red/White US '84, Spec II pipes, Y-boot w/K&N, Fox Shock, Mikuni carbs?

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Re: kobra's 1985 RZ350NC2 basket case restoration

#177 Post by brrrappp » Sun Jan 06, 2019 2:24 pm

About jetting: you will find the stock #20 Pilot usually works fine. It's not worth changing it until you test ride the bike.
The main jets will need to be increased if you expect to get more power with the pipe.
People here advise upward changes to the main jets ranging from 260 to 420 depending on if you keep the airbox, modify the airbox or eliminate the airbox and use toomey intake Y-pipe with single filter or use 2 individual filters mounted directly to the carbs. also altitude and outside temp matter.

The Dyno-Jet kit Has NEEDLES that are different and are height adjustable. The kit comes with larger mains. The needles help get rid of the 3500-6000 rpm stumble/surging that many complain about.


Air screws are capped on the stock USA carbs. You would drill off the cap to adjust. No one sells an original RZ350 USA air screw. HV has a homemade or aftermarket air screw if you need them. The most common reason to replace an air screw is due to the slotted head breaking while trying to adjust a seized screw.

Yamaha still sells the carb top gasket 48H-14536-00 and bowl gaskets 304-14184-00-00.
There are also seals where the throttle linkage goes into the carb that are still available from Yamaha.

Yamaha still sells the US Model RZ Fuel hoses and t-fitting. The fuel hose is kind of odd size if you are trying to find something that looks original. Most common aftermarket hose is very slightly larger I.D. or is shinny black or colored plastic and doesn't look right for restorations.
NOTE: Every time I order the OEM hoses from a dealer I get different superseded numbers on the actual part received except for the 90 degree 2 inch hose.
---The best deal was Yamaha 90445-116K9 (16 INCHES LONG grey with same hose i.d. cut to fit)----
48H-24311-00-00 / 90 DEGREE BEND 2 inch long (this is correct / t- to carb 1
90413-07007-00 PLASTIC T-FITTING (my original was metal)

the order schematic is confusing to look at. Hose P/N 90445-113E8 is a 5 inch long hose.

29L-2416A-00-00 discontinued vac hose (long)

Fuel petcock diaphragm rebuild kits are available if needed from K&L. P/N 18-2730
The petcock to tank special screws and the paper screw washers (90202-05187) are available from Yamaha.
2W6-24512-00 PETCOCK TO TANK O-RING ELONGATED

ZedSledder
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Re: kobra's 1985 RZ350NC2 basket case restoration

#178 Post by ZedSledder » Sun Jan 06, 2019 3:31 pm

http://partsfinder.onlinemicrofiche.com ... CARBURETOR

I used part #22 off this parts list. Its a Canadian company, but this gets you a part number. Pretty sure US carbs need a cap drilled our.

Canadian stock pilot jet is 22.5 and works.
1985 Canadian Rz350. Restored with collector plates. Stock VM26, Triumph Calipers, Galfer brake lines. Brand new DG’s, 260 main, 22.5 pilot jet. Economy pre-load adjusters. Ohlins shock. Oem Banshee crank.

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kobra
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Re: kobra's 1985 RZ350NC2 basket case restoration

#179 Post by kobra » Sun Jan 06, 2019 4:18 pm

Wow thanks you guys - just trying to absorb this all.

I am a little confused about these main jet sizes. How is it that people are running such a wide range from 240 to 420? I read one guy's post who said he was running great with the stock needle and 250 main jet, then went to the Dynojet needle with 420 jet and it also ran great. Maybe I am missing something here and need to do some reading.

BTW that fuel petcock kit isn't listed for the RZ350 on K&L's catalog. brrrappp do you just know that it fits from experience? Regarding the lines, I was planning to run Tygon translucent yellow lines for all oil and fuel.

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Re: kobra's 1985 RZ350NC2 basket case restoration

#180 Post by ZedSledder » Sun Jan 06, 2019 4:28 pm

The higher 420+ jets are for if you remove the airbox and use pods.
1985 Canadian Rz350. Restored with collector plates. Stock VM26, Triumph Calipers, Galfer brake lines. Brand new DG’s, 260 main, 22.5 pilot jet. Economy pre-load adjusters. Ohlins shock. Oem Banshee crank.

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