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Topics - petrolderek

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Japanese Bikes / yds5 engine

« on: November 21, 2018, 04:03:39 PM »

I have a Yamaha yds6 with a yds5 engine fitted at some time in a previous life. I have seen on the internet that some ds5s have an electric start. The question is, is the electric start engine completely different because I cant see any way to fit a starter to my kick start engine or did they use the generator as a starter motor similar to the Villiers dynastart.

Japanese Bikes / spark plugs

« on: June 23, 2018, 07:45:43 PM »

Has anyone else had any problems with new spark plugs. I have worked with engines all my life and am now retired so I have had quite a bit of experience but in the past few years I have had loads of problems with new plugs breaking down. I have a 305 dream and its on its third set of new plugs and its not done 100 miles. Today I started my Yamaha yds5 and it was misfiring on the right cylinder checked the plug and there was no spark changed the plug for one that was in the bike when I got it that must be 30 years old and its fine. These plugs in the Yamaha were new a month ago. Checked the plugs resistance and its showing 30k but the old ones show OL. So what's happening any ides the only thing I can think of is I have had them in and out quite a few times when I had a piston ring problem could it be taking them out when hot or just handling them is causing the problem.

British Bikes / The price of classic bikes is it healthy

« on: May 30, 2018, 04:38:24 PM »

What dose everyone think. There doesn't seem to be any end to the rise in asking prices for classic bikes. Personally I don't think its healthy for the interest or sport or hobby or whatever you might call it. It almost as though everyone wants to be a dealer not really interested in the machine just buying one to sell later for a profit. I don't suppose there is anything wrong with that but at some point its going to end in tears it cant go on. At some point possibly when the interest rates go up prices will crash when the speculators sell them off and put their money back into the banks. Its happened before then common sense will prevail ( hopefully )

Japanese Bikes / yamaha ds5 engine

« on: May 14, 2018, 11:30:57 AM »

Hello
I am new to this forum. I bought a yds6 which has the earlier ds5 engine fitted. It is a usa import and was piston seized, I have fitted new rings and cleaned the carbs. It starts first kick but is not running as it should its well down on power. The left cylinder is not firing as it should there is very little smoke from the exhaust and the head is only warm to touch after running for a few mins while the right is hot.
The spark is good I have switched the plugs around and removed the carbs which seem ok. I am thinking the crank seals are leaking. The question is can the seals be changed with the engine in, what is the best way of checking them first.