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Discussion Starter · #1 ·
Ive been looking through many older threads and things to do with the MC22 however many of the links do not work anymore and most places dont sell vfr or cbr sprockets anymore.
Also some replacement sprockets dont have holes in them whats the deal with that?
 

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Discussion Starter · #3 ·
Honda CBR250R MC19, CBR250RR MC22, Spada JT 17T Front Sprocket | eBay
Changing the front sprocket. | Honda CBR 250 Forum
The replacements i see online dont have holes for the screws however it looks as though they are supposed to? im just recently bought one and am looking to get some more low end torque.
 

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Interesting. What is part# on your engine? My sprocket attachment doesn't use threaded holes in sprocket.



What is spacing centre-to-centre of threaded holes? Maybe we can look through JT & Sunstar sprocket catalogues to find one with threaded holes.

14t front sprocket seems to indicate 520 pitch?
Here's replacement sprocket+chain kit
 

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Discussion Starter · #9 ·
Is this photo of your bike? View attachment 6150 If not, please take one of yours. And also engine#. Lot of the later MC22s were leftover models. I wonder if importers did oddball things to them.
nah its one i found online while during research into an aftermarket sprocket mines an 1990 import im pretty sure ill take a photo in a few days
 

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numbers on the headstock/engine will tell you what year you have. Sourced from "CBR250 Maintenance Guide.doc" I found...somewhere (here? 2fiftycc.com?) and shared it on several facebook groups

CBR250R(J) : 1988;
Engine Number : MC14E – 1000001~
Frame Number : MC19 – 1000001~

CBR250R(K) : 1989;
Engine Number : MC14E – 1000001~
Frame Number : MC19 – 1000001~

CBR250RR(L) : 1990 – 1991;
Engine Number : MC14E – 1140001~
Frame Number : MC22 – 1000001~

CBR250RR(N) : 1992 – 1993;
Engine Number : MC14E – 1140001~
Frame Number : MC22 – 1050001~

CBR250RR(R) : 1994 – 1999;
Engine Number : MC14E – 1400001~
Frame Number : MC22 – 1100001~
 

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Discussion Starter · #11 ·
numbers on the headstock/engine will tell you what year you have. Sourced from "CBR250 Maintenance Guide.doc" I found...somewhere (here? 2fiftycc.com?) and shared it on several facebook groups

CBR250R(J) : 1988;
Engine Number : MC14E – 1000001~
Frame Number : MC19 – 1000001~

CBR250R(K) : 1989;
Engine Number : MC14E – 1000001~
Frame Number : MC19 – 1000001~

CBR250RR(L) : 1990 – 1991;
Engine Number : MC14E – 1140001~
Frame Number : MC22 – 1000001~

CBR250RR(N) : 1992 – 1993;
Engine Number : MC14E – 1140001~
Frame Number : MC22 – 1050001~

CBR250RR(R) : 1994 – 1999;
Engine Number : MC14E – 1400001~
Frame Number : MC22 – 1100001~
my engine number starts with 1144 so i guess its an L model, didnt get to have a look at the sprocket jus changed gauge cluster lights.
 

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my engine number starts with 1144 so i guess its an L model, didnt get to have a look at the sprocket jus changed gauge cluster lights.
Could be N model as well. Engine number for sprockets means more than the frame number. CMSNL will tell you which parts are common with which other bikes if you click into the part and click 'fits models' L model sprocket "also fits", I do think the difference here is tooth count and not spline count. 2 bolt mount will work on the countershafts as long as they have the groove cut for it to slide into/rotate on so that you can line up the offset bolt holes.


CBR250R 1988 (J) JAPAN MC19-100

CBR250R 1989 (K) JAPAN MC19-105

CBR250RR MC22 1990 (L) JAPAN

CBR250RR MC22 1992 (N) JAPAN

CBR250RR MC22 1994 (R) JAPAN

CBR250RR MC22 1994 (R) JAPAN / TYPE 2

VT250 SPADA 1988 (J) JAPAN MC20-100

VTR250 INTERCEPTOR VTR 1989 (K) USA

VTR250 INTERCEPTOR VTR 1990 (L) USA
 

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Discussion Starter · #13 ·
Could be N model as well. Engine number for sprockets means more than the frame number. CMSNL will tell you which parts are common with which other bikes if you click into the part and click 'fits models' L model sprocket "also fits", I do think the difference here is tooth count and not spline count. 2 bolt mount will work on the countershafts as long as they have the groove cut for it to slide into/rotate on so that you can line up the offset bolt holes.


CBR250R 1988 (J) JAPAN MC19-100

CBR250R 1989 (K) JAPAN MC19-105

CBR250RR MC22 1990 (L) JAPAN

CBR250RR MC22 1992 (N) JAPAN

CBR250RR MC22 1994 (R) JAPAN

CBR250RR MC22 1994 (R) JAPAN / TYPE 2

VT250 SPADA 1988 (J) JAPAN MC20-100

VTR250 INTERCEPTOR VTR 1989 (K) USA

VTR250 INTERCEPTOR VTR 1990 (L) USA
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It appears that they both dont have holes hmm okay. Maybe its the later models then
 

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Yes, CMSNL has lots of errors. I've compared their listing with official Honda parts book and many models are completely wrong. Probably because they didn't get Japan-only models that were imported into OZ.
my engine number starts with 1144 so i guess its an L model, didnt get to have a look at the sprocket jus changed gauge cluster lights.
It's possible engine has been rebuilt using transmission from different model.

Here's part we're looking for. Sprocket has 2 bolt-holes and slides onto output shaft with groove for retainer:



Here's correct part with proper photo.

1. What's spacing of bolt-holes centre-to-centre?
2. Please measure thickness of sprocket over a tooth


3. and bottom-diameter across sprocket


I'll research sprocket catalogues to see if there's another sprocket with same spline pattern with bolt holes. Similar sprocket changes from pre-gen Ninja 250 '88-07 to new-gen '08-12 models.
 

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nah its one i found online while during research into an aftermarket sprocket mines an 1990 import im pretty sure ill take a photo in a few days
Any luck with getting photo of your actual bike's front sprocket?
Here's factory gearing on various models. What's tooth-count on your rear sprocket?

CBR250(F) : 2.500 (35/14T) – 520 Pitch
CBR250R(H) : 3.142 (44/14T) – 520 Pitch
CBR250R(J+K) : 3.176 (54/17T) – 428 Pitch
CBR250RR(L+N+R) : 3.058 (52/17T) – 428 Pitch
http://www.jtsprockets.com/catalogue/part/JTF281/
https://sprocketcenter.com/i-304981...itch-chromoly-steel-front-sprocket-honda.html
https://chainsandsprockets.co.uk/products/jtf-281-front-drive-motorcycle-sprocket-13-teeth

These are very different designs, earlier 520 2-bolt sprockets (13-16th) never came in 428 size,. Later 428 pitch front sprockets were only available in 17t with single big-bolt mounting.

JTF281, 14t 520 pitch, 2-bolt mounting


JTF1298, 17t only, 428 pitch, single big-bolt mounting
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@Neenong , any photos of actual front-sprocket on your bike?

I think he may have gotten mixed up by this thread:

This is complete 520 conversion using:
  • 14t single big-bolt front-sprocket from VTR250
  • 53t rear sprocket from dirt-bike
  • any 520 chain, 120-links

I think he got confused by "428" part# of rear-sprocket, even though it's 520 chain-pitch. Then he started looking for 14t front-sprockets for CBR250 line, and it was only available as 2-bolt sprockets from earlier (H) generation. Which he didn't realise was 520 pitch only. Well, any 14t front sprocket for these bikes will be 520, either 2-bolt for CBR250 or single big-bolt for VTR250.

In summary, to get 14t front-sprocket, it's complete 520 conversion needed with 520 rear-sprocket and 520 chain as well.

Here's 53t 520 rear sprocket from dirt-bike. "428" in part# DOES NOT refer to 428 chain-pitch
 
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