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I have one of those IT175's. Just out of curiosity, stock cold engine, no oil, hasn't ran in months, 150psi. They are kind of a high-performance motor.

Well thank you for the comparison! That's certainly telling. Sounds like new top end here we go. And maybe new bottom end. Crap. It was a new crankshaft.

Thanks for the replies so far. I work in a test lab so I'll check the gage and make sure it's on. Probably also do a hot test. Thanks Mark and JKV45 for the numbers to compare with, some depress me and some don't. The bike runs ok, but my gut tells me I'm looking at a full top end treatment.
I think the foam filter element wasn't fully seated or was previously crushed and thus all the sand. Northern Michigan trails are full of (unwanted) stretches of pure sand.

I have a 1979 Yamaha IT175, rebuilt the motor after buying it. Top end got new piston and rings and a honing because it wasn't too worn (yeah I know, should have bored it). Ran ok for a summer. This week I went to drop the carb needle a notch and during that found an alarming amount of sand in the intake. Obviously I need to figure out how it's getting in there, but I feared for the health of this motor and did a compression check. 90 psi cold. I have no idea what it was right after the rebuild. Is this number too low to hope for another season? What numbers would you guys expect for a bike like this at its best? I realize it probably should be tested hot as well. Thanks!

I'm not much into the older stuff but that bike is just too cool.

Whenever I have a broken or missing ring/pin clip they either imbed in the piston or get trapped halfway out the exhaust port.

That's awesome. An NOS seat? Where the heck did you get that?

The pictures showing shiny new heads and their respective unpainted pipes with raw welds are just pure engine porn. I don't have street bikes any more so I enjoy reading about/seeing all the different projects represented on this site. My garage is down to a couple mud covered dirt bikes, 2 strokes of course.

Sweet. Those look too nice to use, but not really.

Wow, looks really good. I think you got a good deal.

Sad to see one left outside like that. The stupid thing looks pretty complete, tough project but it's all there. I can't see it being worth more than 3 or 4k? Depends on how bad you want one I guess. If I'm way off say so, curious to see what do you guys think it's worth?

Not sure why you'd do that to a Daytona. I do like the JL pipes though.

If nothing else I sure do like the look they have.

That is one good looking bike.

Nice. I'm not much into the smaller bikes but that one is sweet.

The black cube in the photo modulates flatulence output. And at least you got a Yambits sticker to aid in the happiness of this RZ journey that began in Michigan.