A forum for owners of Yamaha TTR250 trail and enduro bikes!

Members Login
Username 
 
Password 
    Remember Me  
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Piston kit for 1997 TTR250
Post Info TOPIC: Piston kit for 1997 TTR250
cmlago


Newbie

Status: Offline
Posts: 3
Date:
Piston kit for 1997 TTR250
Permalink  
 

Hi all, it's my first post.

My '97 white TTR needs a new piston, rings, etc.

US parts dealer's websites only show OEM part numbers for 2001 and later models. Can somebody confirm if those numbers are valid for older TTRs?

Also, I'm considering to install a WISECO kit, part number 4689M07350, which is designated for 1999-2006 models. Would it fit my '97 TTR?

Thanks in advance,

--Claudio Lago



__________________
TTRfan


Super Guru

Status: Offline
Posts: 8606
Date:
Permalink  
 

Hi Claudio and welcome to the forum biggrin

The parts from the later TTRs will fit your TTR just fine.

The Wiseco will fit your bike. Used one myself a few years ago and it worked fine. I now use the Wossner piston kits as they are quite a bit cheaper here in the UK.

Don't forget to change the valve stem oil seals at the same time as you do the rest of the work wink

Brian



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ!  

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 
cmlago


Newbie

Status: Offline
Posts: 3
Date:
Permalink  
 

Hi Brian,

Thank you very much for your response.

I decided the cilinder restoration after opening the engine to review the state of the cilinder head.

The initial problem was the engine was increasingly difficult to start. Reading the forum I've seen others also having this problem so I'll comment a bit on this.

After checking other causes (electrical, fuel feed, etc) it resulted the engine had very low compression. As fuel ignition has two prerequisites: a spark AND enough compression, difficult start can be related to deffective starter, ignition or fuel feed and/or not enough compression.

Side note: lacking a pressure gauge, an indication of low compression is the starter motor reving higher and more rapidly than normal. A quick sense of this, having an engine working fine, can be experienced operating the starter with the spark plug removed.

Previously, my TTR engine was operating fine, no strange noise and normal oil consumption. So the issue probably had to be in the valve train which effectively was due to carbon build up, deteriorated valve seats and stem oil seals hardened as rock. Conclusion: the cilinder head gone to a specialist shop for complete restoration.

Doing a compression check each time cleaning/replacing the spark plug can help detecting cilinder head deterioration. The reading should be at least 150psi.

About the piston kit, the engine has around 30.000 miles on it and presumably an amount of wear that I think justifies also doing the cilinder restoration at this time. I have a Wiseco dealer in town so I think I'll go that way. It's nice to know you've had good results using them.

-Claudio



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Piston kit for 1997 TTR250


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard