Did a fresh top end with cast Pistons , Vforce intake work and dg pipes for RD350
Measured the compression - shows 110 PSI on both Cylinders before a cold start.
Is that a acceptable number for compression or something is missing?
Was it done on a cold engine with the throttle wide open? Five or six kicks? That is how a compression test should be done. It might be a little weak but the rings haven't seated yet. I would think 120psi would be more normal.
Lyn Garland
Quote from: Yamaha 179 on June 05, 2021, 07:28:04 AM
Was it done on a cold engine with the throttle wide open? Five or six kicks? That is how a compression test should be done. It might be a little weak but the rings haven't seated yet. I would think 120psi would be more normal.
Lyn Garland
Yes Lyn that's right
Does opening up the intakes to accomodate the Vforce has a impact with compression drop ?
Did a leak down test, no issues found
no effect.
let the ring seat see where it lands after a few runs, then retest when cold.. also, verify accuracy of compression tester. i've been burned by that before.
What Mark said. I bought a good used snap on tester cause cheap ones never read right.