P-85

[mony0_3]

Finally found a machine shop that could drill out my YD100 rod for the 12mm pin and bearing. I used a V1 P-85 cylinder and a Ms-380 piston w/out window. Also tried the 3 extra holes in crank balance and it vibrates at low rpms but smooths out at high rpms. Still breaking in, so not sure how fast she'll go!

 

[GW's Motorized]

Does that have the same power as a P85?

 

[Al Regresar]

Finally found a machine shop that could drill out my YD100 rod for the 12mm pin and bearing. I used a V1 P-85 cylinder and a Ms-380 piston w/out window. Also tried the 3 extra holes in crank balance and it vibrates at low rpms but smooths out at high rpms. Still breaking in, so not sure how fast she'll go!

Nice mash-up of parts. Interesting to see how it comes out.

 

[mony0_3]

Does that have the same power as a P85?

Why wouldn't it? Same cylinder and bottom end. GPS said 44 mph before I backed out of it!

 

[GW's Motorized]

Why wouldn't it? Same cylinder and bottom end. GPS said 44 mph before I backed out of it!

I was wondering mostly about the V1 cylinder. The phantom is now on V3, so it's likely gotten better in performance as well

 

[mony0_3]

That is the same cylinder I had before the bottom rod needle bearings failed, the bike would pull the front wheel off the ground!

 

[ImpulseRocket]

I was wondering mostly about the V1 cylinder. The phantom is now on V3, so it's likely gotten better in performance as well

V1 and 2 cylinders are the same. Only change was the wrist pin bearing. First a new bronze style, which failed, then the second gen V2 had the needle bearing, which is what Damien and I have. V3 changed the shape of the upper transfers a tiny bit, and the intake port inside the cylinder quite a bit.

 

[ImpulseRocket]

Finally found a machine shop that could drill out my YD100 rod for the 12mm pin and bearing. I used a V1 P-85 cylinder and a Ms-380 piston w/out window. Also tried the 3 extra holes in crank balance and it vibrates at low rpms but smooths out at high rpms. Still breaking in, so not sure how fast she'll go!

The low rpm vibration is present on mine too. It's actually not too bad and reminds me more of my dual sport with a low frequency shake most unbalanced 1 bangers have. I wanted to get rid of the high frequency stuff at mid to high rpm, which I did.

You could have done that rod yourself, but it would require a drill press with a leveled table and a 16mm carbide hone (20 bucks). Or just redneck engineered it by hand and hoped lol.

 

[mony0_3]

The guy I took it to didn't have one I guess, he said it was so hard that he used some kind of technique with water!

 

[ImpulseRocket]

The guy I took it to didn't have one I guess, he said it was so hard that he used some kind of technique with water!

Not sure what he means by that. A mill with a boring bar would have done the job no sweat. That's how I machine connecting rods for resizing.