NSR250.net Forums Logo: Honda NSR 250 Forums, Classifieds and Service Manual in English. Covering All Honda NSR 250 MC16, MC18, MC21 and MC28 models
NSR250.net Forums

#
 
#
 
Performance Engineering

  • NSR250 Forums Index ‹ NSR250R Discussion
  • Members Content
  • Members Garage
  • Subscription
  • Transactions
  • FAQ
  • Search
  • Register
  • Log in

Found the water leak, now what?! (Just how screwed am I?)


Reply to topic   printer-friendly view
Page 1 of 2  Goto page 1, 2  Next Download Topic





Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Found the water leak, now what?! (Just how screwed am I?)

Tue Aug 28, 2012 11:51 pm » Post: #1 » Download Post

Had a tell-tell rust trail from the coolant pipe, was hoping it's just a bad hose, but no such luck, pipe came off right in my hand
Now what? Can those pipe fittings be ordered and pressed in or am I replacing both barrels?

Front Cylinder





Rear Cylinder


Back to top


Andy
Site Admin
 
Posts: 11948
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
    Send private message View user's profile
    Reply with quote  

Wed Aug 29, 2012 12:01 am » Post: #2 » Download Post

We've repaired them before, but the spigot isn't a part that's available from Honda.

If you have any dead barrels with good unions you can pull them out and press them into your good barrels, or turn some new alloy ones up. A little sealer on them, and press them home... good to go!
_________________
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!
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Wed Aug 29, 2012 12:54 am » Post: #3 » Download Post

I can spin one on the lathe, didn't think of that till you mentioned it, thanks for the idea.

Guess I'll pull the barrels now, was gonna do it after first ride anyway to inspect and to replace the power valve shaft. Are front and rear same?
What about head gaskets, noticed they have only few holes, which way do I install them?

Cheers!
Back to top


TuckerBag

 
Posts: 259
Joined: 05 Apr 2010

Location: New Zealand. - Plastic Supporter - ZipTie/Duct Tape 1989 NSR250R SP MC18 R6k 1993 NSR250R SE MC21 R9
    Send private message View user's profile Visit poster's website
    Reply with quote  

Wed Aug 29, 2012 7:27 am » Post: #4 » Download Post

I took a photo of how I orientated the head gaskets on my MC18.
See 8th photo down at this link.

I can't actually remember why I orientated the head gaskets that way, but I guess it was obvious to me at the time?
If it is wrong, perhaps someone can let me know.
_________________
[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Wed Aug 29, 2012 12:51 pm » Post: #5 » Download Post

Tucker, I noticed the stamp on a gasket in your photo with "EXUP" assume they all have that and bigger holes go to exhaust side?

Looking around in the workshop section found engine tear-down and rebuild procedure but it says to leave heads attached unless there is a problem with a gasket, might just do that.

Tracked down machinist last night, he called me back just before midnight and we have a date at his shop with my cylinders Smile
Back to top


Andy
Site Admin
 
Posts: 11948
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
    Send private message View user's profile
    Reply with quote  

Wed Aug 29, 2012 3:35 pm » Post: #6 » Download Post

"EXUP" -- EXhaust UP Wink
_________________
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!
Back to top


TuckerBag

 
Posts: 259
Joined: 05 Apr 2010

Location: New Zealand. - Plastic Supporter - ZipTie/Duct Tape 1989 NSR250R SP MC18 R6k 1993 NSR250R SE MC21 R9
    Send private message View user's profile Visit poster's website
    Reply with quote  

Wed Aug 29, 2012 7:22 pm » Post: #7 » Download Post

I thought it must have been obvious at the time. And it was, thanks to EXUP.
_________________
[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...
Back to top


Andy
Site Admin
 
Posts: 11948
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 2:36 am » Post: #8 » Download Post

It's also been in the Workshop section for years!!!

http://www.nsr-world.com/workshop/rebuild/rebuild-4.php

I'm going to say it again, and again, and again... There's not much you can't find on either the forum or the main site!
_________________
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!
Back to top


TuckerBag

 
Posts: 259
Joined: 05 Apr 2010

Location: New Zealand. - Plastic Supporter - ZipTie/Duct Tape 1989 NSR250R SP MC18 R6k 1993 NSR250R SE MC21 R9
    Send private message View user's profile Visit poster's website
    Reply with quote  

Thu Aug 30, 2012 3:50 am » Post: #9 » Download Post

Well in order to prevent Andy having to repeat himself too much, here is a useful hint.
Seeing as there is no readily accessible way to search the main site??

you can type <searchwords> site:nsr-world.com into the search bar of the Google Chrome web browser to easily search the main site.

In this case "head gasket site:nsr-world.com" is possibly quite useful

And as some people seem to sometimes get poor results some of the time from using the forum search, (yes, a debatable point) may I suggest this:
<searchwords> site:nsr250.net/forums

For example "exup site:nsr250.net/forums"

Just trying to be helpful.
Not meaning to criticise NSR-World.
_________________
[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 4:29 am » Post: #10 » Download Post

Thanks!

my problem with searches is not lack of skill but lack of patience to sift through results: it's summertime and I'm very busy at work plus I try to ride as often as I can, winter time is another story, no work, no riding, no money...

Now I hope this does not get me flamed but I would like to ask about swapping heads, my rear head has same issue with coolant pipe as the cylinders, it's rotted. I have a head from a blown up MC18 motor, looks identical to my somewhat trained eye, no visible damage, pretty flat. Question is can I just swap them or should I CC the heads? Both motors seem stock to me so I assume thy can be swapped
Back to top


Andy
Site Admin
 
Posts: 11948
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 12:12 pm » Post: #11 » Download Post

phpBB search isn't the best, I know. Those who are around the longest and read each post can usually recall where/when a relevant post was made, and can often pick it out of search results quite quickly.

Using Google to search here and the main site is undoubtedly better. I'd like to add Google search to the main site, but I refuse to have the advertising that comes with it, and can't afford to pay to use it without advertising. No-one's paying us to advertise here, so very little revenue coming in.
_________________
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!
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 1:01 pm » Post: #12 » Download Post

Searching the parts list I've come up with R2J R4J R5K and R5K-2 is the last one simply R6K? There is no mention of "R5K-2" in the model history

also I assume this is correct way to assemble the power valve shaft? mine had 1 washer under the but and 2 washers on the other side


Back to top


Andy
Site Admin
 
Posts: 11948
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 3:11 pm » Post: #13 » Download Post

This diagram is applicable to ALL models of NSR250.
_________________
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!
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 4:46 pm » Post: #14 » Download Post

One more, what;s the difference between KV3GR E1 and KV3GR E2 heads?

Also my ring gap is 0.50mm and there is "NO DATA AVAILABLE" for MC18 model, I assume since service limit on all others is 0.5 it it should be same/similar on MC18 so these need to be replaced?

EDIT, one ring is .50, others are 0.45-0.47 mm
Back to top


Dmitry
Supporter - Titanium
Supporter - Titanium
 
Posts: 298
Joined: 25 Dec 2010

Location: New England
    Send private message View user's profile
    Reply with quote  

Thu Aug 30, 2012 7:05 pm » Post: #15 » Download Post

I did try Google but no dice

Your search - KV3GR E1 site:nsr-world.com - did not match any documents.

Back to top


Reply to topic   printer-friendly view
Page 1 of 2  Goto page 1, 2  Next Download Topic

NSR250R Discussion

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

  • NSR250 Forums Index
  • All times are GMT
Powered by phpBB © 2001, 2005 phpBB Group


Hosted by NSR250dotNET © 2008 NSR250dotNET