View Single Post
Old November 11th, 2018, 07:10 PM   #1
NinjaBraap
NinjaBraap
 
NinjaBraap's Avatar
 
Name: Tom
Location: Long Beach, California
Join Date: Dec 2016

Motorcycle(s): 06 Ninja 636, 2016 Yamaha R3 (Street/Track), 2019 Ninja 400 Project Racebike

Posts: 175
Blog Entries: 2
Compression Numbers

Hey Ninjette!

Just finished a top end rebuild on a 2004 Ninja 250. After building oil pressure, it started right up almost immediately, then ran it in short sessions. After I was confident it was running well, I let it warm up and adjusted the pilot screws and idle, seemed to be running well.

After all that I shut it down, and did a compression check on each cylinder while it was still warm. I got 120 psi cylinder 1, and 125 psi cylinder 2, which seemed good until I looked in the manual, which said the usable range was 142-218 psi. Before I mounted the engine back in frame I did a leak down test as well and both were holding air well. Cylinder 1 had 30% leakage, and cylinder 2 had 20% leakage, both well in the green, tested multiple times and turned though to be sure.

Wondering what anyone else has seen as far as compression numbers.
__________________________________________________
Racer, Mechanic, Enthusiast. Vendor for Norton Motorsports
Subscribe to my Instagram and YouTube: Instagram
YouTube
NinjaBraap is offline   Reply With Quote