Vintage Dirt Bike Q & A

Just wanted to show off a few pics. It's not a museum piece but not too bad for an old trailbike. I bobbed the rear fender and was looking for a decent one on EBay but I never did find one. The air filter fell apart in my hands so I did a repair job. Luckily, Fred from New Zealand got in a few more UNI filters. What do you think?

Mike

http://www.czmadness.net/P6.jpg
http://www.czmadness.net/P5.jpg
http://www.czmadness.net/P7.jpg
http://www.czmadness.net/P8.jpg

Tried to get the pics to display but this was the best I could do...

Mike,

Very, very nice! I think your fender looks better than the stocker. I finally found one on eBay last month (rear fenders are rarely listed when an MR175 is parted out), but it wasn't in the greatest shape and needs a bit of work. Hang in there, you'll find one.

This site requires that a majority of images be cropped/resized/reduced, which I think is why you rarely see images in posts.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric

Ray,

You are the MR175 guru! I've taken parts left over from a donor bike and I'll be putting together a CR/MR 175 using some of your tips and tricks. Pix coming shortly...

Mike

Mike,

Thanks! I think you'll be pleasantly surprised by the response of the CR/MR motor. It's the quickest-revving engine I've ever experienced.

I have one recent piece of advice... replace the LH crank seal even if it looks OK (Honda P/N 91204-360-003). My MR175 is running strong (new seal), but the MR/CR motor is down on power, bogs at low rpm, and jetting/timing changes are having little effect - exactly the same symptoms as my CR125 motor, which had a bad LH seal and toasted bearing. Also, apparently the 91205-360-000 / 91204-MC7-003 (16 X 28 X 7mm) kickstarter oil seal has been recently discontinued, but the 91204-259-003 seal ('05 CRF150F) looks like a satisfactory replacement; I have some on order. Once the kickstart shaft gets a little sloppy this seal is forced to function as a bearing, and doesn't last long.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric