CBR 250RR MC22 Sprocket in 2022

969 Views 16 Replies 3 Participants Last post by Dannoxyz, 5 mo ago

Neenong

Discussion Starter · 6 mo ago

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?

1 - 17 of 17 Posts

Dannoxyz

· #2 · 6 mo ago (Edited)

Front sprockets without holes? That's common. OEM sprockets tend to be rubber-coated for less noise.

Rear alloy sprockets can be had without holes for maximum strength, they're already light.

This outfit will make sprockets to your specs

https://sprocketspecialists.com/

Neenong

Discussion Starter · #3 · 6 mo ago

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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Dannoxyz

· #4 · 6 mo ago (Edited)

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

www.xcitebikes.com.au

RK Chain & sprockets CBR250R (MC19) & CBR250RR (MC22) CHS101

CBR250R CBR250RR RK Chain & sprockets set

www.xcitebikes.com.au

www.xcitebikes.com.au

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Dannoxyz

· #5 · 6 mo ago

What year/model is your bike? I found following info on factory config:

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

Neenong

Discussion Starter · #6 · 6 mo ago

Dannoxyz said:
What year/model is your bike? I found following info on factory config:

im not sure what year it is im pretty sure its a 1990 model

Neenong

Discussion Starter · #7 · 6 mo ago

Neenong said:
im not sure what year it is im pretty sure its a 1990 model

yeah i just had a look the difference between two pins on the chain was 4/8ths so its 428 pitch im assuming

Dannoxyz

· #8 · 6 mo ago

Is this photo of your bike?

Wheel Automotive tire Crankset Vehicle Vehicle brake

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.

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Neenong

Discussion Starter · #9 · 6 mo ago

Dannoxyz said:
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

thebeefsalad

· #10 · 6 mo ago

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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Neenong

Discussion Starter · #11 · 6 mo ago

thebeefsalad said:
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.

thebeefsalad

· #12 · 6 mo ago

Neenong said:
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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Neenong

Discussion Starter · #13 · 6 mo ago

thebeefsalad said:
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

Product Font Rim Wheel Circle

Product Automotive tire Font Rim Circle

It appears that they both dont have holes hmm okay. Maybe its the later models then

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thebeefsalad

· #14 · 6 mo ago

don't trust stock photos completely. 14t is the part, but thats a 17t sprocket. support ticket to CMSNL might clear it up though.

Dannoxyz

· #15 · 6 mo ago (Edited)

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.

Neenong said:
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.

https://www.cmsnl.com/products/sprocket-srivec14_23801kt7750/

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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3

Dannoxyz

· #16 · 6 mo ago (Edited)

Neenong said:
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

Automotive tire Wheel Motor vehicle Tread Rim

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Dannoxyz

· #17 · 5 mo ago

@Neenong , any photos of actual front-sprocket on your bike?

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

www.cbr250.com

14/53 Sprocket Conversion Mod Explained

[br]Since I did this conversion, alot of people have been asking me about where to buy the sprockets, how much, is it worth doing.. etc etc. So I thought I'd do a write up which can answer all the questions people might have in reguards to it, and include a walkthrough into how it may be done...

www.cbr250.com

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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