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Teds new project a CB500 K1 mostly version 0.5 circa 1972.
Johnny4428:
Absolutely Ted!👍
McCabe-Thiele (Ted):
As posted elsewhere my carbs are off so now taking them apart, changing Brassware - blowing out jet passageways etc.
Found more black bits in the carb bowls. They are going to get a good clean again.
K2-K6:
Hopefully you'll get to the bottom of the problems in the carbs Ted.
I've seen some huge variation in fuel pipe materials in recent years, some with just appalling deterioration within the first year of use, others with very very good materials performance and integrity.
Something that may be worthwhile considering, the float bowl screws and a change to "torx" type. I've managed to get the bowl off a 400 #3 carb in situ to take out and clean the jets, difficult but possible with the hardest part holding a cross bit (used the hex drive from Barhco 1/4 drive) which could much more easily be accomplished with positive location you get from torx screw.
Many of the 750 carb type have a external swinging spring clip to hold float bowl and no screws to facilitate access like this.
McCabe-Thiele (Ted):
I agree with your comments about petrol pipe - aside from the awful pipe that came with my temporary tank the pipe that came from Silicone Planet became strangely supple/soft to the touch so I have replaced it. It might have been okay but not taking the risk.
I know there must be some debris in carbs 3 & 4 as my bike has run primarily on cylinders 2,3 & 4 initially. after cleaning carb 1 jets in place I briefly had it running on all four cylinders. Just before I took the carbs off I ran the bike for a minute or so ending up with it running on 1 & 2 only based on exhaust pipe getting hot.
I am very tempted to fit a pair of inline filters between the two way tank outlet and the carbs as a precaution against any petrol tank debris or bad petrol.
I have one on my 400 that has caused me no issues - finding a decent pipe route to accomodate the metal filter was seemingly impossible until a memember here (Allankelly1) advised me to run a loop under the seat that works well.
K2-K6:
You could also just drop down between the carbs and site filter directly underneath them, then loop back up to get onto feed intake.
It'll make no difference to levels like that.
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