Jump to content

- - - - -

TY250 mono timing marks

  • Please log in to reply
3 replies to this topic

#1 handsome_al



  • Members
  • PipPip
  • 38 posts
  • Location:Northumberland
  • Bike:TY 250 mono

Posted 24 November 2011 - 08:17 PM

Hi everyone,

I'm trying to locate the timing marks on my '85 TY250 mono but my manual has been 'thumbed' so much by the previous owner that I can't make out from the photos where/what the marks are!
The flywheel has a sort of long scratch mark running across the flywheel weight-band towards the crankcase; and the crankcase itself has what looks to be a [chiseled] 'vertical mark' on the mating face that the ignition cover bolts onto. Are these what the manual is refering to as I can't find much else? I'd post a photo but I'm not that clever!

Even if I do it static via the 2.8mm BTDC with a depth gauge down the barrel, I still don't know where, and with what, to line the back-plate up with.

The bike starts and runs quite well but I'd still like to check it for peace-of-mind.

Truly hope someone can help with this: thank you in anticipation ....

Ads By Google User is online

Ads By Google
  • Ad Bots

Don't want these Ads? Why not help support TC and sign up as a Trials Central Supporter?

#2 02-apr


    Advanced Member

  • Members
  • PipPipPip
  • 654 posts

Posted 24 November 2011 - 08:22 PM

I can't remember what mine was like for marks but it would be well worth either checking the marks with your gauge or making some the same way. You then know that they arpe right and, if made properly, you can check with a strobe to save messing about another time.

#3 jse


    Advanced Member

  • Site Supporter
  • 2,372 posts
  • Location:NE Oklahoma
  • Bike:Gas-Gas Pro, TY350s
  • Club:NEOTT-Life member, American Motorcyclist Association-Life Member

Posted 24 November 2011 - 10:18 PM

Here's a quick scan of the pages that might help you from my 85' TY350N manual.


Attached Images

  • 85TY350N (Large).jpg
  • 85TY350N_2 (Large).jpg

#4 handsome_al



  • Members
  • PipPip
  • 38 posts
  • Location:Northumberland
  • Bike:TY 250 mono

Posted 25 November 2011 - 03:03 PM

Thanks guys for taking the time to reply....and Jon for scanning the pages.

The mark on the crankcase is the same as on mine, so at least I now know that's correct.
Flywheel mark? Well if the 'line' that I think is the timing mark is somewhere near when I strobe it, then that's the mark I'll go off.

Thanks once again.


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users