new2ypvs

Cynic and OG, thanks for your help with my RD problem. I decided to keep it simple and took the precaution of installing new plugs before getting into too much trouble with carb disassembly. I am not sure if I have solved the problem, or just masked it at this stage, but, as it goes, the bike is now running. Cheers

I'm pretty sure nothing has disturbed or moved since it got put away. I have taken OG's advice and checked though, and all seems normal. A little oily perhaps, but I don't think its overly worrying ... yet. Before I take the carb off, are there any parts that I could replace whilst I'm in amongst things? Seals, gaskets, jets? It seems sensible to prepare whilst I can. Thanks for your help.

Ok. So a swap of the leads, then a swap of the plugs gives the same problem, ie, dirty smoke from the left cylinder. I turned her off prior to the iminent big-bang as I'm sure its not a good thing to happen. Further investigation shows that both plugs are a touch oily. Added to that, the left exhaust is also more oily than the cleaner right one. Could this mean my piston rings are leaking?

Ok. So maybe swap leads/plugs to see if the problem moves. Cheers, I'll give that a go. What about the fuel-air mix? I had a sudden thought in the night that if the filter is blocked, then the mix ratio will be out. I wonder if this could be a cause? Time in the garage tonight I think. Matt

Hi I'm looking for some advice re. my 1987 RD350 YPVS F2. Before the worst of the weather hit us, I cleaned the bike down, oiled it, greased it, and dowsed in corrosion protector. But now, just a couple of weeks later, it starts (just) and then begins to make 'fart' noises from the left cylinder. After 30 seconds or so, dirty smoke comes out the left exhaust. Then it lets rip with an almighty backfire, accompanied by a small flame out the back. Then cuts out. I have checked the plugs are ok and clean. The compression seems fine, as with plugs out I can feel good pressure when the engine is turned. I've had the exhaust off to make sure there are no big carbon build-ups. Has anyone out there got any ideas for what to check next? Ta Matt