Beefing up the crank & Gearbox in prep for 500cc.

Sub forum for NS400R owners and enthusiasts

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silverstrom
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by silverstrom » Wed Oct 24, 2018 5:30 pm

There is a reason we don't hear much about big engine NS400R builds. It is very expensive and very difficult. There is no straight forward approach.
1985 RZ500 1GE Spec
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ns86
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by ns86 » Wed Oct 24, 2018 7:40 pm

I recall another 500 kit for sale in Australia years ago, pretty sure it was DMR but if not DMR then there have been 3 suppliers
1986 RG500
1985 RZ500
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1994 NSR250sp RE
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1983 RG250
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Ade SYM
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by Ade SYM » Thu Oct 25, 2018 3:32 pm

For the sort of ££ we are talking here you may as well go and buy a NS500!

One sold at bonhams last year in the UK for £23,000 which was a steal

Ade

RC45
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by RC45 » Thu Oct 25, 2018 3:44 pm

Ade SYM wrote:For the sort of ££ we are talking here you may as well go and buy a NS500!

One sold at bonhams last year in the UK for £23,000 which was a steal

Ade
Wow - that 23,000 queens is a steal.

I have been following an RS500 in Japan - when I found it years ago the price was USD$45K, it has crep to USD$65K. And the gent is still not convinced he wants to sell. Same thing with a few RGB500s I tracked down. Their asking prices are both in the USD$75K range.

Honestly, I might have rather bought that UK RS500 in place of the CBR1000RR SP2. LOL
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begbie
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by begbie » Thu Oct 25, 2018 7:31 pm

http://www.classicracereplicas.com/Hond ... -Kit-475cc" onclick="window.open(this.href);return false;

RC45
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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by RC45 » Thu Oct 25, 2018 8:52 pm

This uses bored stock cylinders - looked at this setup 4 or 5 years ago. Havent seen any DMR setups out and about so figured why not go for something totally different :)
CBR1000RR SP2 HRC WSBK
TZ500V/OW53 Track bike
YZR500 OW81 Clone
OW69 Daytona 200 Replica - 784cc Monster
NS400 Track Bike
RS250R NF5
TZ250T 2KM
TZ250B 3YL
TZR250 3MA Track Bike
427ci C5 Z07

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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by podman » Fri Oct 26, 2018 6:45 am

having seen one of Ian Wrights big bored prepped NS400s at Cadwell lapping at (class) record pace few weeks ago, it looks and sounds a pretty impressive set up, how close that is to the 475"over the counter" kit im not sure...

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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by Ade SYM » Fri Oct 26, 2018 9:23 am

I believe the CR125 barrel is an exact fit for the NS400 so am not sure no body has gone down this route as yet.

Would have thought with a little fettling of the barrel to look at the overall tune it may have been a starter.

Any one know if this has been done yet?

Ade

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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by ns86 » Fri Oct 26, 2018 1:00 pm

Ade Said
I believe the CR125 barrel is an exact fit for the NS400 so am not sure no body has gone down this route as yet.
On the NS400r forum https://ns400r.co.uk/forum/search.php?keywords=cr125" onclick="window.open(this.href);return false;
1986 RG500
1985 RZ500
1986 NS400
1994 NSR250sp RE
1987 RG250 WW
1983 RG250
1992 RGV500 WW
1992 RGV500 LS
1989 YZR5003ma
1984 RZV500

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Re: Beefing up the crank & Gearbox in prep for 500cc.

Post by RC45 » Fri Oct 26, 2018 3:35 pm

podman wrote:having seen one of Ian Wrights big bored prepped NS400s at Cadwell lapping at (class) record pace few weeks ago, it looks and sounds a pretty impressive set up, how close that is to the 475"over the counter" kit im not sure...
I chatted with Ian some years ago about doing his 475 kit. For me being in the USA I was trying to consolidate shipping etc. One idea was to buy a suitable donor engine from Dan over at Gecko, send it directly to Ian and have the big bore work done to it then ship the completed motor out here.

That is still my 'last resort' goto - and as the years tick by and donor NS400's dry up I supposed I ought to pull that trigger sooner than later LOL :mrgreen:

Then again I am intrigued by the true 499cc nature of the new production DMR barrels.
CBR1000RR SP2 HRC WSBK
TZ500V/OW53 Track bike
YZR500 OW81 Clone
OW69 Daytona 200 Replica - 784cc Monster
NS400 Track Bike
RS250R NF5
TZ250T 2KM
TZ250B 3YL
TZR250 3MA Track Bike
427ci C5 Z07

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