Scott's NC30 Track Bike Build

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Timon
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Re: Scott's NC30 Track Bike Build

Post by Timon » Wed Mar 06, 2019 10:04 am

Thats a new one on me!

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Re: Scott's NC30 Track Bike Build

Post by richyrd5 » Wed Mar 06, 2019 11:00 am

Jeeezus...that's bad!!

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Re: Scott's NC30 Track Bike Build

Post by TZcRank » Wed Mar 06, 2019 5:45 pm

The inner has been cut out of an 18 inch and welded into a gutted 17 inch rim........

Phoned the guy today, apparently raced 2 or 3 full seasons then used as a track bike ever since.
Welds look good, whoever did it knew their stuff. If it runs true I don't see much of an issue......???

Will take a better pic tomorrow, keen to hear some feedback on this.

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Re: Scott's NC30 Track Bike Build

Post by ChowderV4 » Wed Mar 06, 2019 8:45 pm

I Mean if it has been done by a experienced engineer then should be okay.... But how much do you belive people say. Could have been done by Fred in the shed and happened to have got it true.

Can say I've never seen that before.

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Re: Scott's NC30 Track Bike Build

Post by ScottieDucati » Sat Mar 09, 2019 11:39 pm

Knowing how scarce 17” wheels for those bikes were back in the day.... that’s really ingenious!! You can always send the wheel to get an x-ray if you suspect any cracks. But if all the welds look good and she spins true I’d run it!


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Re: Scott's NC30 Track Bike Build

Post by TZcRank » Sun Mar 10, 2019 7:24 am

Having 8 spokes and 8 independent welds I'm inclined to think it's safe to run. Or at least as a spare!

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Re: Scott's NC30 Track Bike Build

Post by TZcRank » Tue Apr 02, 2019 3:18 pm

Maiden track voyage recently with the classics at Redstar Raceway. I had done a few miles on the bike around the neighborhood to make sure that nothing fell off (lol) and was meant to get it to Friday practice at the track for a shakedown but missed that sadly. So it was straight into quali on Saturday morning. Not a good idea for a new build. Also made a few last minute changes on Friday night that complicated race day.......decided to use the tank and rearsets off the flood bike. My first issue was that the shift linkage was all wrong for a road shift pattern and was incredibly hard with absolutely no "feel" on the lever. A bit of fiddling and it was slightly better but ultimately matching the lengths of the linkage arms (it was much longer on the lever compared to the one on the selector shaft for some reason) combined with changing it to a race all down pattern improved it somewhat. Second issue was it dropped a cylinder early on in the day, turns out the tank I put on still had crap in it which found its way down to the carbs. Pulled a piece of silicone gasket maker out of the offending cylinders main jet on Sunday! Also had fine black silty shit in all four carbs. Lessons learnt, don't make on the fly changes the night before race day. Came stone last in the first heat but managed to at least get past a few pesky pre-slings in the second heat. Was absolutely impressed with the handling of the bike, could chuck it into a corner and it just goes where you look. Also no problem changing lines mid corner or tightening up the line when I felt a bit wide. Super impressed as that's exactly what I was hoping for with this bike. I've not touched suspension setup as yet, not even sag so looking forward to getting it a bit more dialed in!

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Re: Scott's NC30 Track Bike Build

Post by TZcRank » Thu Apr 04, 2019 5:01 pm

Need some input please, as mentioned earlier I bought a fourth VFR that was unfortunately involved in a flash flood during a rare cloud burst.
2m of water in the garage within the space of 20min! Poor guy lost around 10 bikes in his garage plus the entire contents of the house, insurance didn't pay out on a technicality. Anyway this bike was obviously not high on the priority list and only the oil was drained and it then stood for 2 years.

Now the first thing I noticed when I went to pick the bike up was the RVF carbs, thought somebody retrofitted them on the VFR.

Image

Also noticed that the trumpets are all the same length when I took the airbox off.
Any insight here also appreciated.

Image

Stripped them down, not pretty! Soaking them as we speak.

Image

The only change to the airbox is the front snorkel is removed and the filter has been gutted, only the mesh is left in place.
Based on this I thought a straight swap onto my motor was possible with minimal changes and setup.

But today I noticed that the flood bikes engine is silver.......quick check on the engine number (NC13E-1503951) confirms its RVF.
Chassis is an early model VFR.

Now my question is, are there worthwhile gains to be had fitting RVF carbs to my VFR motor???
How much will setup differ to stock VFR carbs?

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Re: Scott's NC30 Track Bike Build

Post by ScottieDucati » Thu Apr 04, 2019 5:28 pm

VFR carbs flow more but either can be made to make power. I run a stock airbox for my NC30 racebike. Friend ran a ram air setup with his RVF carbs that works well using HRC kit parts.Do yourself a favor and send yours out to mike at v4hondacarbs.com. He knows these carbs better than anyone I’ve met and can’t speak highly enough. They’ll come back ready to bolt on and ride. There are lots of things you can’t really see or get to that he can suss out. Found 3/4 idle jet tips seized into my carbs rendering them junk. He’ll tell ya straight what you have.




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Re: Scott's NC30 Track Bike Build

Post by TZcRank » Fri Apr 05, 2019 9:22 am

Thanks for the feedback ScottieDucati. Being from the Southern part of Africa, sending carbs to the States is simply not an option, by the time I get them back here with the exchange rates etc will far exceed what I initially paid for the first VFR! I know my way around carbs and motors and besides I just don't have the budget to outsource work on my race bikes.

The RVF carbs did sit with water in them for a significant period of time but are definitely salvageable!
All pilots, emulsion tubes and jets came out without any hassles, slight corrosion on 2 of the float needles only.
Confirmed all passages are clear including the 3 holes just behind the butterfly's that are part of the internal circuits.
Going a bit later to fetch a parts set of RFV carbs this afternoon, so will have spares too.

My question is directed more at the different cam duration's etc between VFR and RFV.
Will I have any issues setting up the RVF carbs on the RVF motor?


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