'87 Honda NSR250 'ELF Special'
- Thread starter Moa
- Start date
Dale
Coast to Coast
Re: NSR250 revival
Well that's really great to know!
Also on the PGM issue!
Looking forward to seeing what you do here.
Do you have the original body kit?
Moa said:Called econohonda this morning, asking about the crank, really nice and helpful place. They have several used cranks available for $200 + extra for new seals etc. They're not guaranteed, but given their scarcity, that seems like a good deal to me
Dale, you might want to keep them in mind if you find yourself needing another difficult to get nsr part in future, they deliver worldwide.
Well that's really great to know!
Also on the PGM issue!
Looking forward to seeing what you do here.
Do you have the original body kit?
Moa
Been Around the Block
Re: NSR250 revival
Yes, got the original bodywork, I haven't really looked at it since I pulled it off. I think there's a few cracks which should be repairable. I'd like to get the fairings looking mint as they obviously are what you mostly see. I quite like the 80's styling, but the original paint/decal scheme I'm not such a fan of. I think a unique paint job will really do the design justice.
Stay posted, plenty more to come, I'll post another pic update soon.
Dale said:
Yes, got the original bodywork, I haven't really looked at it since I pulled it off. I think there's a few cracks which should be repairable. I'd like to get the fairings looking mint as they obviously are what you mostly see. I quite like the 80's styling, but the original paint/decal scheme I'm not such a fan of. I think a unique paint job will really do the design justice.
Stay posted, plenty more to come, I'll post another pic update soon.
Moa
Been Around the Block
Re: NSR250 revival
Got my flywheel puller in the mail today, and so went straight into pulling the bottom end apart. The flywheel was on so damn tight I thought I was going to break something. I eventually got it to pop off though. This is what it looked like inside the crank case:
The right side crank bearing had seized up and there was quite a bit of rust around it. There's a small hole that leads from near the transfer ports to the machined surface where the bearing sits. I think it's there to help supply lubricating fuel/oil mix to the bearing. It appears that water has come through the intake ports, flowed through this hole and rusted the bearing and right side of the crank. The top spark plug was off when I got the bike so water could have easily got inside.
The cases were very dirty, so I gave them a good degreasing and attacked them with the wire brush and dremel. They came up ok. I'd like to have had them bead blasted, but I'm trying to finish this build without spending too much. Who's going to see the engine anyway.
Does anyone know how to remove the primary drive gear from the end of the crank shaft? I can just take it to a bike shop if it's too difficult to do at home with basic tools.
Got my flywheel puller in the mail today, and so went straight into pulling the bottom end apart. The flywheel was on so damn tight I thought I was going to break something. I eventually got it to pop off though. This is what it looked like inside the crank case:
The right side crank bearing had seized up and there was quite a bit of rust around it. There's a small hole that leads from near the transfer ports to the machined surface where the bearing sits. I think it's there to help supply lubricating fuel/oil mix to the bearing. It appears that water has come through the intake ports, flowed through this hole and rusted the bearing and right side of the crank. The top spark plug was off when I got the bike so water could have easily got inside.
The cases were very dirty, so I gave them a good degreasing and attacked them with the wire brush and dremel. They came up ok. I'd like to have had them bead blasted, but I'm trying to finish this build without spending too much. Who's going to see the engine anyway.
Does anyone know how to remove the primary drive gear from the end of the crank shaft? I can just take it to a bike shop if it's too difficult to do at home with basic tools.
Moa
Been Around the Block
Re: NSR250 revival
Found a mysterious package on my doorstep this morning. Picked it up read the label "sender: econohonda...", woo hoo my crankshaft has arrived already ;D. Opened it up, hmm it looks a little different, the primary drive gear is smaller. It came with a label attached: part# 13000-KV3-000. Damn! they sent me the wrong crankshaft
. I asked for the 13000-KV3-010 version.
Tried it out in my cases to see if it would fit. It doesn't. As you can see by the photos below, it's a bit shorter than my old one, and the seals are different. Also, the primary drive gear is smaller and has two fewer teeth.
Found a mysterious package on my doorstep this morning. Picked it up read the label "sender: econohonda...", woo hoo my crankshaft has arrived already ;D. Opened it up, hmm it looks a little different, the primary drive gear is smaller. It came with a label attached: part# 13000-KV3-000. Damn! they sent me the wrong crankshaft
. I asked for the 13000-KV3-010 version.Tried it out in my cases to see if it would fit. It doesn't. As you can see by the photos below, it's a bit shorter than my old one, and the seals are different. Also, the primary drive gear is smaller and has two fewer teeth.
Moa
Been Around the Block
Re: NSR250 revival
Gave econohonda a call, apparently the 000 and 010 cranks are exactly the same. He suspected that my bottom end is from an MC18 or later. Even thought the engine number begins with MC16, the numbers after indicate a later model engine. I'll have to do a bit of research into this issue.
Gave econohonda a call, apparently the 000 and 010 cranks are exactly the same. He suspected that my bottom end is from an MC18 or later. Even thought the engine number begins with MC16, the numbers after indicate a later model engine. I'll have to do a bit of research into this issue.
Moa
Been Around the Block
Re: NSR250 revival
Ive been doing a bit of research in the nsr-250 forums. I now believe my engine may be from an MC18 model. I'm almost certain the cylinders and heads are of the mc18 variety. I'm very pleased about this, the mc 18 barrels are suppose to have the best stock porting, meaning more power! ;D. I would assume the bottom end is also mc18, but I'm going to get the opinion of an NSR know it all before I start ordering parts. Some sources lead me to believe this could be a mc21 bottom end. Econohonda are happy to refund the crank, but unfortunately they only have mc16 cranks, no 18's or 21's.
Dale, you wouldn't happen to know how to identify which engine I have would you?
Ive been doing a bit of research in the nsr-250 forums. I now believe my engine may be from an MC18 model. I'm almost certain the cylinders and heads are of the mc18 variety. I'm very pleased about this, the mc 18 barrels are suppose to have the best stock porting, meaning more power! ;D. I would assume the bottom end is also mc18, but I'm going to get the opinion of an NSR know it all before I start ordering parts. Some sources lead me to believe this could be a mc21 bottom end. Econohonda are happy to refund the crank, but unfortunately they only have mc16 cranks, no 18's or 21's.
Dale, you wouldn't happen to know how to identify which engine I have would you?
Dale
Coast to Coast
Re: NSR250 revival
Hi Moa,
Well you've established that you don't have a MC16.
- The MC16 and MC18 both had the hexagonal heads. I see you've got the hexagonal head, based on your pics.
- Now the MC18 hexagonal Barrel bolts right onto a MC21 bottom end.
- So its not completely decisive whether you have a MC18 or not, but chances are high.
- MC21 and MC28 motors are virtually identical.
- Heres a pic of my 28 crank case. Can you see any obvious differences? Bad pic, sorry.
- I have a MC18 motor, but its not with me at the moment...
Hi Moa,
Well you've established that you don't have a MC16.
- The MC16 and MC18 both had the hexagonal heads. I see you've got the hexagonal head, based on your pics.
- Now the MC18 hexagonal Barrel bolts right onto a MC21 bottom end.
- So its not completely decisive whether you have a MC18 or not, but chances are high.
- MC21 and MC28 motors are virtually identical.
- Heres a pic of my 28 crank case. Can you see any obvious differences? Bad pic, sorry.
- I have a MC18 motor, but its not with me at the moment...
Moa
Been Around the Block
Re: NSR250 revival
Here it is:
I was doing a bit more research online last night. Looks like the MC18's are not fitted with a gear position sensor, but the MC21 onwards is. Is this also your understanding? The selector drum itself doesn't have the GPS slot on the shaft.
If this is an MC18 I would still like to know what variant it is r2j, r5k etc. The engine number is 1130166, but I cant find much clear information relating the engine number to a specific model. Browsing through old nsr-world forums posts suggests that it's probably an r5k. It's all still a bit confusing to me though. I just want to be sure, so I can avoid ordering the wrong parts again.
Dale said:
Here it is:
I was doing a bit more research online last night. Looks like the MC18's are not fitted with a gear position sensor, but the MC21 onwards is. Is this also your understanding? The selector drum itself doesn't have the GPS slot on the shaft.
If this is an MC18 I would still like to know what variant it is r2j, r5k etc. The engine number is 1130166, but I cant find much clear information relating the engine number to a specific model. Browsing through old nsr-world forums posts suggests that it's probably an r5k. It's all still a bit confusing to me though. I just want to be sure, so I can avoid ordering the wrong parts again.
Moa
Been Around the Block
Re: NSR250 revival
Right, I'm pretty sure I've identified the engine as an 1989 MC18 r5k. Found these images of an r5k crank: http://edetuckracing.blogspot.co.nz/2010/06/nsr-mc18-crankshaft-picture.html
Compare it with this '88 MC18 crank on Yahoo Japan: http://page11.auctions.yahoo.co.jp/jp/auction/n109117471
You can see that the centre bearing on the '88 crank has a separate seal, whereas the image of the '89 crank shows an o-ring seal around the bearing. The images of the '89 crank look to match my crank exactly, so I'm pleased to have solved that little problem.
Right, I'm pretty sure I've identified the engine as an 1989 MC18 r5k. Found these images of an r5k crank: http://edetuckracing.blogspot.co.nz/2010/06/nsr-mc18-crankshaft-picture.html
Compare it with this '88 MC18 crank on Yahoo Japan: http://page11.auctions.yahoo.co.jp/jp/auction/n109117471
You can see that the centre bearing on the '88 crank has a separate seal, whereas the image of the '89 crank shows an o-ring seal around the bearing. The images of the '89 crank look to match my crank exactly, so I'm pleased to have solved that little problem.
Moa
Been Around the Block
Re: NSR250 revival
Yep, those cranks for the later model mc18's seem pretty elusive though, but I'm not expecting to find one right away.
In the mean time I'll be pricing up other engine parts. I got a quote to get my barrels re-plated, $575 for one, $895 for both. Might be easier to find a good used barrel instead, as one of mine is still useable. There's only one place in New Zealand that re-plates cylinders, so I may look to sending mine overseas if it's going to be cheaper. I've also bought an airbox and kickstarter.
It may take awhile, but this build is definitely going to happen!
Dale said:
Yep, those cranks for the later model mc18's seem pretty elusive though, but I'm not expecting to find one right away.
In the mean time I'll be pricing up other engine parts. I got a quote to get my barrels re-plated, $575 for one, $895 for both
. Might be easier to find a good used barrel instead, as one of mine is still useable. There's only one place in New Zealand that re-plates cylinders, so I may look to sending mine overseas if it's going to be cheaper. I've also bought an airbox and kickstarter.It may take awhile, but this build is definitely going to happen!
Dale
Coast to Coast
Re: NSR250 revival
Moa, spoke to Mario last night... he has a MC18 crank available for sale...
nsr250spares.com/
Use the contact tab on the site to get hold of him.
He will give you expert advise as well.
Very knowledgeable.
Moa, spoke to Mario last night... he has a MC18 crank available for sale...
nsr250spares.com/
Use the contact tab on the site to get hold of him.
He will give you expert advise as well.
Very knowledgeable.
