Hi guys, please can you help me check I have the right PGM and carb solenoid set up for my bike?
I'm assuming that this is a NSR250R7L…..does that mean I should be looking at the 'L' model in the workshop manual?



The reason I'm asking is the 'L' in the manual shows two solenoids and a four way pipe connector.
My bike has one solenoid and a three way connector:



Is this bike supposed to have a gear position sensor and PGM-III?
My GPS has been removed and blanked off with silicon, also it looks as though it was only a neutral switch anyway as there is a single green wire dangling in that area….Also I cannot find anywhere in the loom to plug in a multi-pin socket that a GPS has.


I'm a bit confused because the set up looks more like the "K" in the manual but that has a different frame and swing arm, etc.
Hoping you can shed some light on this and put my mind at ease that my new baby isn't a miss mash of older models.
Thanks in advance!!!

Interesting!

That's a 1988 R2J/R4J PGM and air correction solenoid.

There's no reason why it shouldn't run with it, but it's not what I'd call ideal, and will probably take some fiddling (more with the jetting, than anything else) to get it to run cleanly.
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Andy.
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Hmm, something fishy is going on here.
What do you think about the PGM module, should it have more plugs?

So to translate what Andy said into plain English, you've got the wrong PGM fitted to your bike.

If that is the case, be prepared for more "surprises".

I`ve spotted another surprise for you............There`s no chain............

Sorry, I didn't read Andy's reply properly.
Normally I like surprises but this is starting to sound like somebody has wee'd on my biscuits.
So if the solenoid and PGM is from a MC18 then probably the carbs are too.
Um….how do I check the engine?
Do you guys have a resource for cross referencing engine numbers?

All NSR engines start mc16e.... If you have a gps plug on the clutch side of the engine? if not it may be an older engine

Do you have hexagonal cylinders and heads? They are mc18s.

nxrsr20 wrote:
Do you have hexagonal cylinders and heads? They are mc18s.

MC16s also have hexagonal cylinders, don't forget!

There's nothing wrong with MC18 carbs. They are 32mm, the same size as MC21.
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Andy.
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Another question is what is the wiring loom from? also the ignition system? carbs? etc..

I've just seen your photostream, and you have a proper bitza there! Sorry, but I hope you didn't pay much, as that's going to need a lot spent on it!

My initial guess would be that the PGM-III failed, most likely, looking at the rest of the bike, due to poor maintenance! Rather than go to the "expense" of another PGM-III, someone has transplanted an older, invariably cheaper, 1988 PGM (ECU) and harness. (The 1988 PGM "I" is just called "PGM".)

Once the harness was transplanted, they've found that the air correction plumbing didn't match, so sold/swapped the carbs for MC18 carbs... which are also extremely suspect, looking at the internals you have pulled from them!

The MC21 may be the Japanese gymkhana weapon of choice, and sorry to be the bringer of bad news, but I'm afraid it's going to take an awful lot to ever get that bike to be anywhere near back to running like an MC21.

My advice to you would be to bite the bullet now, and source a PGM-III, and 90~93 MC21 harness and carbs.

Sly Fox wrote:
What do you think about the PGM module, should it have more plugs?

Sort of in answer to your previous question, the PGM, PGM-II, PGM-III, and PGM-IV all have their own unique harnesses. So, technically no, the PGM has the correct number of plugs on it... for it to fit to a 1988 harness!!!
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Andy.
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Thank you very much guys for your advice so far and taking the time to look at my photos.
I did pay a lot for it so I'm disappointed it isn't the bike I thought it was going to be.
I'm going off for a little cry in the corner and then I'll be back to make some sort of battle plan.

I'm in the same position with a non-NSR project, I keep hitting self-induced misery (like breaking bleed nipples in calipers).

When you're ready to make the battle plan, be sure to consult us (the forum). It sounds like you've got Andy in your corner willing to provide his encyclopaedia like knowledge to make your bike work. Us as the forum always will try to help where possible and it's also good to share your learning experience.

Ok, I've had a lie down, a sulk and told the wife a pack lies

I think Andy's supposition is true.
It also explains why the GPS is missing and the hole is blocked off with a huge blob of silicon,
also a green neutral wire floating about in that area because they have had to fit the MC18 Flywheel and coils.

Backstory time:
I came by this bike three months ago on a London based Importers website.
They explained the engine was seized and it would come with a spare.
It was still in Japan at the time so I put a £500 deposit down on it.
I assumed that Japanese motorcyclists are not the 'brain-out bodging' muppets we have in the UK.
I can't put any blame on the Importer, they wouldn't have known the bikes hidden secrets.
The engine that was in the bike is absolutely frozen solid from standing still for ten years or more.
It did come with the spare engine as promised but although carefully prepared for storage has a rumbling crank noise when I turn it over by hand.
So basically men, it's a very expensive disaster.

The Battle Plan:
Rebuild the bike, turn it into a Motogymkhana weapon and win the 2015 Championship, HOORRAA!!
Let's face it, I couldn't pass this turd onto someone else!!!
Of course, this is going to be a lot more fun with your help…..thanks in advance guys.

OK, this is probably going to sting a bit, but I do have a reputation to maintain...

I'll give you the £500 for it that you put down as a deposit.

No disrespect, but in my opinion, that's not a project to take on as a first NSR. It would only work out for me because I already have a lot of the stuff needed to put it right.

The project would be good for you if you'd been in to NSRs for some time, and amassed a collection of parts already. However, in all sincerity, you would be better off cutting your losses early, and get a better, running bike within the UK, and learning all about it whilst actually having the benefit of using/competing. Not only do you need to source a lot of NLA (no longer available, and hence VERY expensive) parts, but you are also starting on the bottom rung of the NSR knowledge ladder. And trust me when I say although the MC21 is probably the least complicated of all the 80s/90s 250 race reps, there's still an awful lot to learn!

I reckon you will have to put at least £1500 in to this bike to get it to, at best, a usable state. Probably more like £2k at today's prices.

PM me if you want to talk about it.
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Andy.
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Andy wrote:OK, this is probably going to sting a bit, but I do have a reputation to maintain...

So what is your reputation, High Executioner or Master of Reverse Psychology?
It will be cheaper for me to sort this bike out because I'll lose £2000 if I sold it to you for £500 and then I would probably need to spend another £4000 on a clean bike which still needs rebuild and also has dodgey 25 year old electrics. So basically I'm in too deep already.

You are the expert Andy and I respect you opinion on this but I am going to have to disregard it and keep flying toward the sun.
Can I still count on you technical advice and support on my journey? please, please, please.