Crankshaft assemblies arrived

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Vinpg
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Crankshaft assemblies arrived

#1 Post by Vinpg » Sun Apr 29, 2018 2:55 pm

Cranks arrived Friday, gonna do some measuring and plug in all the shipping then on to the site

trix
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Re: Crankshaft assemblies arrived

#2 Post by trix » Mon Apr 30, 2018 12:32 pm

Hi Gus
I had been trying to contact you by pm etc with no success. I was trying to find out if you're going to get any NS400 cranks made??
thanks

Vinpg
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Re: Crankshaft assemblies arrived

#3 Post by Vinpg » Mon Apr 30, 2018 1:57 pm

I have tried many peeps to get one and that was a no go, I am interested in that! I'll have piston kits soon and an RD 400 crank. I have to have a good sample to start with.

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Speed Freak
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Re: Crankshaft assemblies arrived

#4 Post by Speed Freak » Tue May 01, 2018 7:43 am

I have a damaged disassembled NS400R crankshaft at home.
Center conrod big end bearing failed, other parts are OK.
=> Center crank pin is pressed in on both sides, a very simple part.

Should be fine to get measurements to reproduce it.

PM if you are interested.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

Vinpg
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Re: Crankshaft assemblies arrived

#5 Post by Vinpg » Tue May 01, 2018 11:16 am

Is it the rods that are nla?

Vinpg
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Re: Crankshaft assemblies arrived

#6 Post by Vinpg » Tue May 01, 2018 11:21 am

If all the pins are removable unlike the rz/Rd it would be a simple rebuild kit, I'm gonna try and do all nla main parts for the cool 2-strokers

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Speed Freak
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Re: Crankshaft assemblies arrived

#7 Post by Speed Freak » Tue May 01, 2018 12:54 pm

Most of the NS400R engine parts are NLA including pistons, conrods and crankshaft + crankshaft bearings + seals.

Not all pins are removable, only the center pin
The outer crank pin`s are integrated into the inner webs.
All in all you need 4 different tools for webs (maybe 3 as you can use the same raw part for the 2 outer webs, just different machining)

You can`t do a simle repair kit as the parts are also worn out where the main bearings are sitting.
Don`t know what happens there, I think they are simply too soft.
60000km and they are dead.

Image

Image
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

Vinpg
Posts: 73
Joined: Wed Sep 13, 2017 7:35 pm

Re: Crankshaft assemblies arrived

#8 Post by Vinpg » Tue May 01, 2018 1:57 pm

I'll check with a buddy to see what he has for parts, Au to USA is expensive shipping


So no one makes a rod kit or sells main bearings

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Speed Freak
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Re: Crankshaft assemblies arrived

#9 Post by Speed Freak » Tue May 01, 2018 4:21 pm

http://www.classicracereplicas.com" onclick="window.open(this.href);return false;

Main bearings are Koyo, I can check if I can get them.
No aftermarket conrods available as far as I know.
I also did not find standard spec pistons.

Bike has coated cylinders instead of steel sleeves.
Would be nice to have aftermarket crankshafts with new rods and a piston kit.
Then you can coat your cylinders if they are out of spec and run it again with standard bore.

This is exactly what I would need to rebuild the original engine of my 400.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

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