Ty250 Engine Mods
Posted 21 March 2006 - 08:29 PM
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Posted 21 March 2006 - 08:43 PM
Here is what I did to power up the TY
- I changed the airfilter cap, so it had a much bigger hole -> less pressure drop -> more power
- I installed a power exhaust (back part of exhaust). That really made a big difference, it had the same power at very low rpm but from the middle and up into the high rpm’s it was like having a new engine.
- If the front part of the exhaust is full of old residues it has no power, so clean it out. I used to burn the residues out one time a year.
- The last thing would be to change the piston rings and check the tolerance between cylinder and cylinder.
I hope you can use my advice. Good luck with powering up your TY250.
Posted 21 March 2006 - 08:57 PM
Posted 21 March 2006 - 10:38 PM
Posted 22 March 2006 - 07:37 AM
Please tell us which TY250 you are talking about. There are three different TY250 twinshock engines (TY250, TY250B and the later series from 1976 onwards with prefix 493) and then there are the air-cooled monoshock series engines and the watercooled TY250Z models.
I just wondered what some of the engine mods people do to the TY250 engine. I rode another TY a while back and it had unreal power from idle and pulled like a train.
Posted 22 March 2006 - 03:35 PM
Posted 23 March 2006 - 08:27 AM
This means that one option for you for more grunt is to get the barrel and head from or fit a whole motor from a later model TY250.
Another option for more grunt is to big bore your motor to 320cc which requires a bigger cylinder sleeve and piston, the head welded and machined and the crankcases machined to suit the sleeve. You may also need to raise the cylinder with a barrel spacer if the piston you use has a lower gudgeon pin location.
Another option for better low RPM power is to fit boyesen reeds and a reed case spacer.
An option for more power in the midrange is to have a specially designed expansion chamber and muffler made up to replace the standard exhaust.
I suggest that you have a ride of an unmodified B or later model TY250 before you decide on a course of action.
Posted 23 March 2006 - 04:25 PM
Posted 23 March 2006 - 07:23 PM
Contact Bob Ginder at B&J Racing http://www.bjracing.com/ and he will certianly be able to help you out.
but they are no substitute for brains!
Posted 23 March 2006 - 08:03 PM
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