Hi there, I'm trying (again) to fix up a mates '89 RGV 250 (K model, I think ???). This has been something of an ongoing project, that hasn't been touched for 18 months, possibly 2 years. Here is the history so far: One of the valves lost a stem, the valve dropped into the piston. Seizure! Said mate removed heads & barrels, left motor in the frame, under a car port that leaked. Here the bike stayed, for possibly up to 12 months. By the time I started work on the poor thing, the crank was rusted solid, none too surprising. I replaced the crank (2nd hand), piston, rings, barrel, valves, etc... I put the whole thing back together. What I found was that I had good compression, but could only manage to idle on 1 barrel, from memory the left (rear). When it was revved up, over 6 - 6500, the valves kicked in, at which point the right (front) barrel started firing. It almost appeared that the left barrel stopped firing at this point. I suspected the carbs, since, one was full of water for so long, the fuelways were corroded. I replaced the carb. No change. I swapped carbs. No change. Next I suspected electrics. I have replaced EVERY electrical component in the system. No change. It was lastly suggested that there should be a gas seal between both barrels. I tested this theory today. Poured some petrol into 1 barrel, which just flooded out of the other barrel. I now have the engine back out, with the cases cracked. The crank has a seal between the 2 counter weights, only, I don't see that this could be a gas seal, since there is a SERIOUS amount of slop present. So, now for the questions: 1) Should the middle seal on the crank be a tight fit? 2) Should there be a gas seal between both barrels? 3) Any new suggestions, because, I have exhausted all of my current ideas. All ideas appreciated. Thanks, Peter.
