TRX250R.ORG

Workshop => Engine and Bottom End => Topic started by: sanddad21 on March 10, 2014, 02:16:03 PM

Title: oem crank or hotrods diffrence:
Post by: sanddad21 on March 10, 2014, 02:16:03 PM

how can you tell if the crank its self is oem. Did Honda put any markings on the tins or anywere else????

Title: oem crank or hotrods diffrence:
Post by: Pumashine on March 10, 2014, 07:02:37 PM

OEM short rod is marked KA4. No markings I know of on the crank. Take a pic and we will tell you!

Title: oem crank or hotrods diffrence:
Post by: sanddad21 on March 10, 2014, 10:40:37 PM

(http://forums.trx250r.org/vbulletin_imports/228_1200_2017-04-18_1396.jpg)

Title: oem crank or hotrods diffrence:
Post by: sanddad21 on March 10, 2014, 10:46:17 PM

I have three cranks one of them has H M stamped on the side of the tins

Title: oem crank or hotrods diffrence:
Post by: sanddad21 on March 10, 2014, 10:49:38 PM

Last one(http://forums.trx250r.org/vbulletin_imports/228_1202_2017-04-18_7915.jpg)

Title: oem crank or hotrods diffrence:
Post by: Pumashine on March 11, 2014, 11:43:20 AM

Here are 3 OEM also. Yours look like Honda to me.
(http://i61.tinypic.com/4vk8qo.jpg)

Title: oem crank or hotrods diffrence:
Post by: C-Leigh Racing on March 11, 2014, 11:58:41 AM

Quote from: sanddad21;28530

(http://forums.trx250r.org/vbulletin_imports/228_1200_2017-04-18_437.jpg)

This is the second crank I've seen, that the pin hole has been bored, plug pressed in, but not stroked. Is there some reason the plug was put in & then machined back to the STD stroke. The whole idea with the plug pressed in is for the stroking process.
Maybe it was a stroker at one time, still good crank halfs & just converted back to STD stroke.
Neil

Title: oem crank or hotrods diffrence:
Post by: sanddad21 on March 11, 2014, 02:47:32 PM

Neil & Tony thanks for responding. NeilI'm not sure what the story was with that crank, I got that one whit a parts lot that I bought a long time ago. The crank with the #1 on it is the crank that was in my motor, the wrist pin clip came out and the the pin slid over and groved the side of the cylinder wall pretty bad, so iI figured I better rebuild or replace the crank.
thanks for the help
steve