Well I bought an 87 Ninja 250 used with 35,000km about 2 weeks ago, and I've been having some troubles.
Here are the basic symptoms:
1) Bike is very difficult to start.
2) when it dioes finally start, it won't idle or stay running below the 2500-3000rpm range. It's fine above that, but bogs down and dies below that.
I've fiddled with the idle mixture, but that just isn't fixing the problem. The bike did have low compression (125psi on one side, and 150 on the other), but I adjusted the valves and got it up to 170 on one saide, and 155psi on the other.
Thanks in advance,