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

Again! this time is crankcase inlet


Reply to topic   printer-friendly view
Page 1 of 1   Download Topic





Blackbunny

 
Posts: 5
Joined: 16 Jun 2006

    Send private message View user's profile
    Reply with quote  

Again! this time is crankcase inlet

Sat Jun 17, 2006 6:09 am » Post: #1 » Download Post

Thanks for every answer for this hybrid motor. now i'm sure that it's not a MC21 engine may be 18 or 28 and do wiring GPS's 3rd gear to earth all time will effect side stand switch safety function? so let try ..


Now.. my crankcase was splitted for replacing of bearing, connecting rod and sealer and I notice that lower cylinder inlet( right carb) has an excess lug that result the right inlet area is less than left inlet area about 30%!! I can't find the way to attach the picture along but I can really say it's much smaller.>(30% by sight.. about 7-8 mm each side and top side) should both inlet look similar? ?What result the designer aim from these lug? port velocity or it's just a restriction?

Could I take some benefit if those lug are grinded off ?

please let me know ..every idea are very welcome > I'm trying to make this bike's great run as far as possible


.... and how could i know that a oil and power jet solinoid are work properly?? .... very thanks
Back to top


Andy
Site Admin
 
Posts: 11950
Joined: 19 Jan 2004

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

Sat Jun 17, 2006 9:55 am » Post: #2 » Download Post

We really need to see a picture, but you dont want to be grinding anything off the inlet tract - at least on any of the later models (MC18, MC21, MC28).

I've not had a good look inside an MC16 yet, but I suspect it's a similar story there too.
_________________
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


paul g
Supporter - Titanium
Supporter - Titanium
 
Posts: 1140
Joined: 16 Jul 2005

Location: Cambridge, England
1991 Honda nsr 250 mc21 sp
    Send private message View user's profile
    Reply with quote  

Sat Jun 17, 2006 2:33 pm » Post: #3 » Download Post

If it is a ramp type off thing just at the point where the crankcase flows into the crank dont remove it it is supposed to be their. I had a post on here about January time titled mc21 crankcase cleanup. Matt from Tyga replied and advised not to touch it.
Back to top


Wrench.

 
Posts: 272
Joined: 19 Oct 2004

Location: TriCities, WA USA
    Send private message View user's profile
    Reply with quote  

Sat Jun 17, 2006 2:51 pm » Post: #4 » Download Post

All the NSR cases are like that where one side is narrower than the other. It absolutely does not restrict airflow. I believe what it does is make the crankcase volumes more equal between the two cylinders.
_________________
Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS
Back to top


Dave Ett
Site Moderator
Site Moderator
 
Posts: 3648
Joined: 20 Feb 2004

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

Sun Jun 18, 2006 8:00 am » Post: #5 » Download Post

May also be related to intake velocity and getting the misture swirling for better mixture.

Well it might! Laughing
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Back to top


Reply to topic   printer-friendly view
Page 1 of 1   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