250r piston help
Page 1 of 11 123 ... LastLast
Results 1 to 10 of 107
Like Tree10Likes

Thread: 250r piston help

  1. #1
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63

    250r piston help

    I recently bought a 1988 250r from a buddy that he was having trouble getting it to kick start it came with a 1988 310 engine and the engine on it is suppose to be a 1986 with a 265 kit I tore the engine down and the exhaust side of the piston was missing I was thinking that it had a blowed head gasket and it caused it to melt the piston but I’m not sure the engine has a spacer plate under the cylinder so I’m assuming it has the long rod in it but I’m not sure I cleaned the cylinder up and it seemed to clean up nice so I was gona put a new piston and rings in it but I’m not sure what year piston to get I googled the numbers on top the old piston and came up with a 68 mm wiesco 1986 piston but I was just wanting to try make sure that was the year piston I needed and the reason tgat it broke or melted was not because someone had the wrong piston it any advice would be greatly appreciated

  2. #2
    Senior Member aztecgwynn's Avatar
    Join Date
    May 2008
    Location
    Mesa Az
    Posts
    1,597
    Take pics of numbers on rod and post!
    that will help

  3. #3
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63
    K I have put the 310 kit on it right now I will try to tear the engine back down this weekend and get some pics of the rod thanks for your reply

  4. Remove Advertisements
    TRX250R.net
    Advertisements
     

  5. #4
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63
    This is the piston that came out of it and the cylinder that came off of it and the rod
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	77C97217-BD9E-4F0C-9216-F113091ABCC4_1570385395181.jpeg 
Views:	33 
Size:	524.8 KB 
ID:	61317   Click image for larger version. 

Name:	4BB97FB9-5B10-4088-8DE5-031BBCF51A3E_1570385427762.jpeg 
Views:	42 
Size:	1,008.6 KB 
ID:	61319   Click image for larger version. 

Name:	2C9CD487-9D5B-41E6-B556-F486093B21F1_1570385464239.jpeg 
Views:	32 
Size:	1.03 MB 
ID:	61321   Click image for larger version. 

Name:	4CE207B4-BF36-4143-B305-D24ABE6C1914_1570385500059.jpeg 
Views:	35 
Size:	545.6 KB 
ID:	61323  

  6. #5
    Senior Member aztecgwynn's Avatar
    Join Date
    May 2008
    Location
    Mesa Az
    Posts
    1,597
    that is a short rod crank Justin posted from an 86 ATC TRX 250R if it says HB9 on crank it is from an 87-89 Honda TRX 250R and will be long rod and if it said KA$ that would be from an 85 ATC 250R also short rod.
    Not very familiar with hot rods cranks but post any identification number that are on crank. I am sure Carlos will chime in he know a great deal about these bikes!!

  7. #6
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63
    Since this is a short rod is it suppose to have the spacer plate on it or not have one it had one on it

  8. #7
    Senior Member aztecgwynn's Avatar
    Join Date
    May 2008
    Location
    Mesa Az
    Posts
    1,597
    No spacer plate

  9. #8
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63
    Are the cylinders the same for the 86 through 89 wonder y they had the plate on there just not knowing what they was doing when they put it together or something

  10. #9
    Senior Member american opel's Avatar
    Join Date
    Sep 2012
    Location
    ashtabula ohio
    Posts
    3,961
    that looks like a long rod crank with a short rod piston.do you have a picture of the other intake side of the piston.long rod piston has a square hole and a sr piston the bottom of the skirt is a u shape.from left to right.sr stock piston..sr big bore piston long rod piston. and all cylinder are a touch different but a spacer plate isn't needed unless a stroker crank,or 70mm+yz250 piston
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00372.JPG 
Views:	29 
Size:	1.90 MB 
ID:	61325  

  11. #10
    Member Justin335's Avatar
    Join Date
    Sep 2019
    Posts
    63
    I will post that pic when I get home from work when I set the cylinder and head on there without the spacer plate the piston hits when it gets to the top I appreciate all the help I would be lost on what I have without all of the help
    american opel likes this.


 
Page 1 of 11 123 ... LastLast

Remove Ads

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •