Fresh out of the box NS250 owner making 2nd post here. Followed up on a thread in the NSR section then found this one, so...
Another NS250R ('84) Owner Here - ja... not many of these around!

I have the same problem as Wayne on the resurrection I am trying to perform on an NS250 that sat many years; fuel pump.
Looking at the respective positions of the components and applying the principles of gravity, would it not be reasonable to assume the fuel pump could be bypassed/eliminated completely?

Currently the goal is to make it run before staring in on any cosmetics (it needs bodywork repairs and paint). If it runs fine and doesn't need crank seals or something 'engine out and apart' major, I'll go ahead with making it pretty. Otherwise it goes down the road.

Other than a few details, the bike is essentially unaltered or modified with about 19K km on the dial:


There are a couple things that are not standard like the left silencer and the ignition switch, but it is mostly complete. It could be restored to a high level of accuracy, but that's for the next owner.

Warren

Hellow Warren, and welcome to NSR-WORLD.COM.

As I expect you have already read, we are unfortunately very short of info and experience regarding the NS250F/R, but hope to see more of your progress in due course.

If we start to generate more posts and interest, I will look into obtaining a Service Manual and scanning/publishing it. We do already have an OEM Parts List available here which may be of some use:

https://manuals.nsr-world.com/view-ns250r.php
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Hey Andy,

Thanks for the welcome reply! The NS250 Parts Manual is what led me to this site - much appreciated. That is basically the net sum total of what I have found out about these bikes. Thankfully the NSR is close enough to figure out some of the wiring and connectors and such.

Tough dealing with this rare of a machine, but that is what seems to find me. It's apparent there are few just by looking for previous sales records - both of them, haha. I did find one person parting one out in Ukraine, so the test-package is on the way - my Lt. handlebar switch took a hit somehow and it smashed the button off and cracked the housing Hope the parts make it because the switch is unique to the 250's.

Can't wait to ride it!

Warren

I've found a late Service Manual, but it's going to be knocking on for £70 by the time I get it to the UK... and it's not even a new one! They're generally 300-500 pages and very difficult to scan (very thin pages, so "bleed through" is a major issue), and of course only in Japanese, so it's a bit of a commitment, but I am pretty keen to get some support going.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Well, never let it be said that I'm not committed to supporting our members... I've ordered a genuine Service Manual from Japan.



I already have a mountain of work on, so it's not going to get scanned any time soon, but if there are pages or a specific section needed, then I can make an attempt to do those on request. I won't have time to translate it though.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Hi Andy,

You're a Star! Your message was a nice surprise.
I understand the importance of building a library, and the cost; I dug around a bit and didn't find where to submit support/donations, so if you have a P.P. account or a P.O. Box, send me a PM and I'll chip-in on the manual.

You will probably still have the NS documentation copied before all the pieces of this puzzle arrive in AZ - I call projects like this one Nipponese Jigsaw Puzzles - and a test in patience. Thanks for the offer for when I get stumped and 'sleeping on it' doesn't work!

Regards,
Warren

I'll drop you a PM, Warren.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Service manual finally on its way!




_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

At least the invoice is in English! Looking good!
Fuel pump is now an empty hole, and the aftermarket ignition switch is in and working. All it needs is some gas line (and fuel), and it will be ready to try and start.
Been fixing broken tabs on the fairing now. Plan on painting it white again, but may have to get a set of NSR graphics for lack of originals.

Warren

Because I can't help myself...



I could draw up some NS250R vector images to get cut locally, if you want. This is one I did all the decals for. From drawing, to cutting, and applying...


_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Hey Andy, looks like you have been having fun - thanks for your efforts!

Great news - it's Alive =)

After getting the carbs cleaned, electrics figured out, the new ignition switch wired in, and the lights and horn working, I wanted to check for spark 'just to be sure;' I pulled the wire off the front plug, stuck in a dummy and kicked it through as hard (fast) as possible with my hand while watching for sparklers ... and it started on the rear cylinder only! I shut it down, hooked up the front wire, and it started on the first kick easy as pie.

I had gassed it up with the premix bottle (always use premix on the first starting) beforehand to make sure the carbs didn't leak, so it was ready to go, which it did. The motor sounded tight with no excessive piston slap or crank-bearing noise - these motors are surprisingly quiet. The center crank seal is good too because it settled right into a smooth, low-rpm idle. The motor is quite fine.

Nice job on the race bike graphics; it looks totally bad++! I appreciate the offer and may take you up on it if plan A foils - the path of least resistance. I did find a seller in the UK that offers the NS250R Rothmann graphics, but other than generic Honda decals, that was about it. I did order a sheet of universal black transfers with the tank wings and block-letter Honda for the fairing (plus a couple smaller 'Honda's' to put on the rear section). Straight white with black graphics; the good seat I have is black - the red one is ripped. There were quite a few broken tabs and cracks to repair (used fiberglass cloth for strength); there were some old repairs already, so no heroics on this fix. I figure the next owner would appreciate the option to change graphics (or plastics) with the least effort, so am thinking minimalist with just enough contrast to not look stark.

Life is good - hope it stays that way,
Warren

Warren P. Warner wrote:
...I wanted to check for spark 'just to be sure;' I pulled the wire off the front plug, stuck in a dummy and kicked it through as hard (fast) as possible with my hand while watching for sparklers ... and it started on the rear cylinder only! I shut it down, hooked up the front wire, and it started on the first kick easy as pie.

Fantastic! Sounds like it was really keen to get going again!

All the Honda "Vees" are smooth, which often leads to people thinking they are slower than their contemporaries. The quite linear power delivery mirrors the smooth running, even in the 2-strokes, making them rather deceptive.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Hi Andy and the rest of the enthusiasts, I have a Fuel Pump update; they are necessary. I gave the bike an aggressive ride, and it starved for gas. At first, I thought I forgot to turn the gas on - I hadn't. I popped off the side cover and tested the fuel flow - slow but steady. After sitting there about 5 minutes giving the carbs time to fill, it again started right up, and starved for gas again just as I pulled up to the house.

So I went in the hunt for a compatible pump since an NOS was not to be found (the only OEM NS250R pump I could find was used). I ended up buying a nearly identical aftermarket pump - this one:
https://www.ebay.com/itm/305362488548

It is virtually identical to the original except the pressure side spigot was straight instead of a 90 degree bend - even the plugin was the same. It took some doing because of where the pump was squeezed in between the rear shock, behind and above the motor, and almost dead center in the middle of the frame under everything - lots of routing clips to keep the lines away from the chain, pipe, and cylinder head.

NS250R's need a fuel Pump.

I sold the bike, and I suspect the new owner 'Jason' will probably join-up and take over for me here. I learned TONS about the bike, and found it to be very well designed and a blast to ride, even if it was only a mile! The new owner is a lifetime enthusiast, and was as excited about the NS as I was - I'm glad I had the opportunity to own it and have a true enthusiast / ex-racer buy it!

Thank you Andy for the help and acquiring the Parts Manual; I used it a lot!

Regards,
Warren

Well done Warren. It's great to have this info for anyone trying to keep an NS on the road.
You didn't mention the model details which could be lost in the future, so I have pasted it in this post
GL1200A Goldwing 1200 Aspencade 1984-1986
_________________
Why do things simply when you can complicate them

Thank you, Rob.

One day you're going to have to accept a Moderator cap!
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!