OzVMX Forum

Marque Remarks => Yamaha => Topic started by: KTM47 on November 18, 2013, 05:06:15 pm

Title: Eligibility for Pre 90
Post by: KTM47 on November 18, 2013, 05:06:15 pm

In the MOMS for the Pre 90 classes in says "Acceptable for Pre 90 class are machines and components built up to and including the 1989 model. The only exception to this rule is where the model remains unaltered after this date."


What I would like to know is what changes were made to the YZ/WR 490/500s after 1989. eg 1990, 1991 etc models.

Title: Re: Eligibility for Pre 90
Post by: g465b on November 18, 2013, 08:07:08 pm

89 to 90 yz490-   graphics and std bars

Title: Re: Eligibility for Pre 90
Post by: kim80y on November 18, 2013, 08:47:11 pm

WR 500 uses the later 250 frame and swingarm etc from the 250's.

So definitely out.

Cheers
Kim 8)

Title: Re: Eligibility for Pre 90
Post by: KTM47 on November 18, 2013, 10:45:16 pm

Quote from: g465b on November 18, 2013, 08:07:08 pm

89 to 90 yz490-   graphics and std bars

So a 1990 YZ 490 could be considered legal for Pre 90 as it really is a carry over model.

Title: Re: Eligibility for Pre 90
Post by: kim80y on November 19, 2013, 08:30:29 pm

Yes.

Only very minimal suspension changes between 87 and 88, 89 90 exactly the same other than slight could changes/ graphics.
The most notable change of the pre 90 YZ490 years was 86 to 87- suspension changes and port changes.

Cheers
Kim 8)