SOHC.co.uk Forums > CB350/400

Starting Mystery

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Eldrick:
When I had a sometimes hot sometimes cold exhaust pipe it was a sticking (bent) inlet valve. Only found that out when I cleaned the pistons and that specific valve was tougher to remove.

Otis:
Today was the first opportunity I have had to consider the solutions put forward by the very kind contributors to my post.

What I found today was quite different to my previous posts.

The bike had been sat for a few weeks and knowing that the electric start doesn't work I knew I would need to kick start it. On this occasion, she fired up on the third easy kick but this time cylinders 1 & 4 warmed up quickly and 2 &3 Lagged behind, very different to the previous scenario!

I had noticed that cylinder 4's carburettor overflow was pouring. I tapped the side of the bowl and it stopped. After running for a few moments it settled into a smooth and seamless idle and couldn't have sounded better.

I tend to think this is a carburettor issue and not a spark issue?

McCabe-Thiele (Ted):
When I have been out on my 400 I turn off the fuel tap a short distance from home, by the time its on my driveway its starting to splutter a bit so I keep the revs up until the engine runs out of fuel, this drains the bulk of the fuel out of the bowl.

In my relatively short experience with my 400  I find that on turning the petrol tap back on it sometimes floods as the float valve has stuck open. I have found that just rocking the handle bars from left to right when off the stand immeditely stops any flooding.

If I am planning to ride out several days in the same week I just switch off as normal leaving the bowl full of petrol. It does not flood in this situation.

exvalvesetdabbler:
I had that in one carb where the float would stick down, a gentle tap with a screwdriver handle would in most cases sort it out.  Like you I turn the fuel off about 3/4 mile from home if the bike isn't going out until the next weekend.  Saves on it stinking out the garage  a bit as well. It also starts a lot easier when the carbs have had a drink of fresh fuel.

In the end it was found to be the frame of the float has got twisted when trying to dismantle a gummed up pin after being parked for a couple of years. 

Dave

kevski:
Sounding like a carb problem, ie pilot circuit, pilot jets maybe gumming up, the overflowing down to float needles either particls jamming them open or jamming and not closing, I took the needles out of mine and polish the 3 ribs with a 1200 grade paper and polished the tips lightly with solvol along with the seats using solvol and a cocktail stick, overflowing cured.

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