Jump to content

1975 Yamaha Ty250 appears to have larger aftermarket reed valve intake.


CBLOHR
 Share

Recommended Posts

My recently purchased 1975  Yamaha Ty250 appears to have an enlarged aftermarket reed valve intake. I had to cut a new carb to air cleaner boot by about 15mm to get it to fit without crimping. Does anyone know what brand of aftermarket "performance" reed valve upgrade blocks would have been common back in the day. Or does anyone know of someone who still provides a block and reeds that would fit? My current reeds are frayed and broken.

Link to comment
Share on other sites

 

 

Aftermarket reed blocks are/were not a common mod on the twinshock TY250 motor.

Many people fit aftermarket reeds to the standard reed block.

Standard TY250 reed blocks are readily available second-hand.

Sounds a bit like it might have a reed block spacer. That would move the carby rearwards

Link to comment
Share on other sites

 
 
 
On 12/7/2022 at 7:29 AM, djr said:

Possibly other Yamaha reed blocks / rubber inlet manifolds from the DT, RD ranges could have been fitted as a perceived upgrade, or just because of availability ?

Reed cage for the TY250 are the same part fitted to RD350s

  • Like 1
Link to comment
Share on other sites

 
On 12/9/2022 at 8:39 AM, tony27 said:

Reed cage for the TY250 are the same part fitted to RD350s

Yes, you are right.

I have had various Yamaha's over the years.

Bolt pattern for the reed cage & rubber inlet is often the same pattern , allowing sometimes bigger / longer rubber inlets to be fitted from a different & sometimes more popular model.

I could be wrong , but seem to remember having a TY175 or 250 , which had a DT175/250/360/400  ?  rubber inlet that bolted straight on and allowed a bigger carb to be fitted

You also have some of the YZ and RD ranges from various years that may have identical parts , or interchangeable but larger parts 

Link to comment
Share on other sites

 
  • 4 months later...

The TY 250 was notorious for having a strangled induction (too many twists etc). So the best way forwards was to improve the induction route to smooth the passage of air to the intake port. Some riders said at the time that the engine was too responsive when modified and needed taming down. Now a days it might be too tame!

Link to comment
Share on other sites

 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...