SOHC.co.uk Forums > CB350/400

starting issues

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Ken4004:
Hi Aerial

Have you resolved your cold start issue or is it still under investigation ?

Regards Ken

Ariel-KH-500:
I removed the carbs yesterday and put them through the ultrasonic cleaner again at 60 degrees and for a 20 minutes , replaced the carbs and bike started ok I then rebalanced the carbs using my vacuum gauges. Bike start fine and ran ok on the bench. today I will start the bike again to see if all is cured although the real problem was when it had stood for a few days if it stars o k today I'm then going to leave it for a few days and see if it will start as it should. One question for the experts is there anywhere where I can get some new felt seals for the slide lifting spindles. will repost in a few days with an update.

Ken4004:
Hi Aerial

When you took the carbs off the bike and open them up did you notice anything in the bowls like jelly ? , just wondering if the ethanol in the fuel has reacted with any moisture and this is clogging your pilot jets.

I had this once where I filled up with fuel at Sainsbury’s and within a mile of riding from the station the bike stopped and fuel was pouring out of all four carb over flows .

I removed the carbs to clean them and found lots of this jelly substance .

It would be nice to see something blocking the jets when you have taken the trouble to remove the cards from the bike !

Ariel-KH-500:
No the float bowls were spotless inside,I always use e5 petrol (Esso) in all my bikes always from the same garage. After re fitting the carbs it started fine then left it for 24 hours and again started fine I am now going to leave it for 4/5 days and then see if it starts ok, the problem has always been when the bike has not been started  for while if started every day no problems. I will post again next week with the result after it has stood un started.

Ariel-KH-500:
An update on the starting issues, after the 2nd ultrasonic clean and carb balance the bike started 1st press of the starter it was then left over night and again a 1st press start. the bike was the left untouched for 4 days again 1st press start it was left again for 5 days and again started right up I've been out on it yesterday and did approx 80 miles with a stop at around half distance. I am now going to let the bike stand for a week and see if it still starts ok after not being started as this was always the main problem so far so good will report again when I next start the bike.

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