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Author Topic: NSR250 MC-21 GT250R  (Read 2551 times)

Dannyvirk

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NSR250 MC-21 GT250R
« on: December 01, 2016, 08:54:40 AM »

Heya

I thought i'd put a few pics of a project i'm doing in my dinning room up, It's  a honda chassis with the injected 2011 GT250 engine in it I started it 4 days ago.





Cheers

Robert
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AJC650

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Re: NSR250 MC-21 GT250R
« Reply #1 on: December 01, 2016, 10:33:31 AM »

Brilliant - in the dining room too, I'm guessing you are single, but if not - she's a keeper!!! ;)

Why this combination of frame and engine - are these just parts you had lying around?  Very interesting anyway, keep us informed!  ;D
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Joss

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Re: NSR250 MC-21 GT250R
« Reply #2 on: December 01, 2016, 11:00:40 AM »

One for me to keep a watch on.

I agree with AJC650, have we found someone else to blow a Honda engine?
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Cloud

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Re: NSR250 MC-21 GT250R
« Reply #3 on: December 01, 2016, 10:12:47 PM »

have we found someone else to blow a Honda engine?

The NSR uses a two-stroke race engine; even with "Honda" stamped on the side, it's not going to be splatterproof.
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Joss

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Re: NSR250 MC-21 GT250R
« Reply #4 on: December 02, 2016, 09:44:00 AM »

have we found someone else to blow a Honda engine?

The NSR uses a two-stroke race engine; even with "Honda" stamped on the side, it's not going to be splatterproof.

I'm familiar with the engine, it was a comment to provoke further conversation from Dannyvirk as to why hes dropped the original engine not about how reliable two stroke are.

Personally I'd of kept it but then I have soft spot for two strokes.
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Cloud

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Re: NSR250 MC-21 GT250R
« Reply #5 on: December 02, 2016, 04:14:12 PM »


It's going in to that mountain bike there by the window.
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Dannyvirk

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Re: NSR250 MC-21 GT250R
« Reply #6 on: December 03, 2016, 11:15:12 AM »

Heya.

AJC650 you were right on both counts, and i miss her so very much.

I've owned two NSR250 MC-21's putting a total of 30km on them combined. I built one up from parts and sold it as a whole bike and the other one, this one, I brought running and sold what's not there as parts. I brought the first one, the parts bike about 6-7 years ago, I remember going there meeting the guy and loading the bit we had into the car, but i can't remember my reason for purchasing it.  Here's a video of the first time I tryed to start the bike I brought as parts https://www.youtube.com/watch?v=BPZJVJQXBSQ , The second bike which is the one I have now was running when I brought it. https://www.youtube.com/watch?v=UdLQKx4oo5I . When I changed the gearbox oil in the running bike there were fragments of steel in it. When I disassembled the engine I found the, the engine had been put together from parts from different models and when they assembled the gear box they put a shim in an incorrect position so there was interference between the dogs on two gears when it wasn't in that gear. I found this out by buying another gearbox and comparing the two and the seeing the difference, then seeing the damage this has done. The shim was maybe two millimeter thick, only an a fool wouldn't of noticed the gears were offset. Like so often with honda's they build a fairly decent product but poor maintenance and bad executed modifications just kill them. So I had a most of MC-21/18 SP dry clutch engine in a pile of boxes. It was at this point I made a painful appraisal of the entire seen, and decided life was to short to spend my life mastering a motorcycle that in the 5 or so Kilometers I did on it that one and 25km on the one I built up, I found it totally impractical. I could write hundreds of words on the 'performance' mods that had been done to this bike with no understanding of the consequences, his attempt to get around the speed limiter was both sad and funny. The engine had good compression, I had no reason to doubt the crank and it had the SP dry clutch with carbon cover. All parts that are a dwindling resource. I meet someone with too much money and sold the boxs of bits for $800. This was after paying $3000 for the whole bike. I think I sold about another $800 worth of parts and what was left sat on my deck for about 4 years. no-one would buy it.

I decided to re-power it with a big single cylinder engine and found a front ended KLR650 with 5000km on the clock. I wrecked all bits I did'nt need off the KLR and a guy offer $1900 for the engine. So I thought it was crazy not to take the money. The bike would never been worth that when I had finished it. So i doubled my cash on the KLR but it took two years. You win some, you lose some.

20 years ago when I used to ride, power and speed was alot of fun. Someone I know, mentioning no names who owned an 89' ZX-10 saw an indicated 265km/h on the open road. Today that kind of behaviour would get you jail time and be in the national news with sound bites of hysterical women howling 'what about the children, something's got to be done'. So with times a changing i really need to build a bike that looks cool but takes quite some effort to get into trouble on.

Enter Hyosung, Alot of learners in New Zealand buy them, and I think because the fairings must be expensive, they become insurance write offs with very little damage. It might even be possible to write a hyosung off just by not putting the sidestand down properly and it falling over. This bike was completely rideable by the guy that brought it off the insurance company. He brought the bike because he wanted a front end for a moto guzzi project he was building. So I got the complete 2011 injected bike less front end, switch gear and tank for $500. I expect to sell close to that much in parts that are left over. I think by the time the chassis, fairings and headlight with mount go, the engine and everything I need will owe me about $100 US dollars.  So price and availability are the minor factors that have lead to the this engine chassis combo, the major factor however is an internet series called 'roadkill', it's on you-tube, you may of seen it. Because I'm completely unemployable I have a lot of time on my hands watch to stuff like this and it's sort of infectious. Like them, I did'nt even bother pulling out a tape measure to see if it fit. I spend more on beer in a week then what it will owe me when I sell all the other stuff. I just kept hacking away till till it slid in. When everythings running, I will replace all the material I have removed. There will be no sloppy engineering and this is in no way an excuse for it, but it will be a single seater bike with around half the horsepower it had at the factory. There are many problems to be solved and I have only simple hand tools, but I have no doubt this will be a reality and it will look different to anything else on the road today, The total budget including the rothmans body kit will be less than US$1500. Should anything go wrong engines are extremely cheap, unlike NSR engines that only a handful of very talented and expensive people can build and tune. So far it's be the most fun i've had in ages. To some it's a dirty motorcycle but to me it's an expression of individuality and technology.

Cheers
« Last Edit: December 03, 2016, 11:57:41 PM by Dannyvirk »
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2turbos

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Re: NSR250 MC-21 GT250R
« Reply #7 on: December 03, 2016, 02:16:48 PM »

Amazing what can be accomplished with hand tools and lots of time!
I wish I was close enough to drop on by and give you a hand, Dannyvirk!!
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Dannyvirk

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Re: NSR250 MC-21 GT250R
« Reply #8 on: December 03, 2016, 02:40:17 PM »

Heya. I remembered I had some old fiber glass out in the yard and thought why no do a bit of a mock up to make sure everything everything fits. Please forgiven the roughness, but it gives and idea of what it will sort of be like when done. Cheer

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Dannyvirk

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Re: NSR250 MC-21 GT250R
« Reply #9 on: December 03, 2016, 03:12:35 PM »

Heya. Two turbos, thanks for the kind words. I still really have no idea if what I'm doing is 'right' thou. For some people working with me drives them nuts because I tend to stop and do very little if I realise i don't know what i'm doing. For me 'stalling' often seems to throw up easier solutions. There is probably over 50 problems that still need to be resolved. The thing i'm most happy about so far is that I have failed to injury myself or break anything. As I've aged I don't seem to lose things like I used too when I was younger. I remember spending so much time trying to find things when I was young, everything seemed to take so much longer than now. Cheers
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