Carb Synch and Enrichener Circuit

[BA80]

I had mine turning 8000 in forth gear while climbing Pine Mountain. I rolled off the throttle and crested the hill at less than 60 mph. A state trooper was waiting at the top. Lucky day.

I can't get 8K in 4th gear either, I have an 850FD so 4th is the same as 5th with a stock FD. Running the twisties in NC I'm in 3rd or even 2nd most of the time.

[jetmechmarty]

Running the twisties in NC I'm in 3rd or even 2nd most of the time.

Me too! My final drive is stock.

[vedgar]

sf VS sg WARM UP

my 79 sf warms up faster than my 80 sg. The 80 carbs have a leaner mixture screw setting from the factory than do the 79,s. Any one else on this one ?

[skids]

If it holds idle after it warms-up you are good.

[MPittma100]

Enrichment Circuit

my 79 sf warms up faster than my 80 sg. The 80 carbs have a leaner mixture screw setting from the factory than do the 79,s. Any one else on this one ?

Agreed. Earlier 1978 & 1979 models warm right up. 1980 and 1981 models being leaner don't like the cooler temps, but are OK after longer warm up.

Mike

[bikerphil]

It all depends on your float/fuel level determining the engine's 'cold bloodedness' when cold starting. Also, if your carbs have leaky float valves, more fuel will drain down in the bowls from the lines/filters when the bike is shut off causing a cold 'no enricher needed' starting condition.

[LoHo]

It is funny how our expectations change. I am now looking for smoother idle and better mpg...a few months ago, I would have been delighted with "starts."

[Schming]

It is funny how our expectations change. I am now looking for smoother idle and better mpg...a few months ago, I would have been delighted with "starts."

Next thing ya know you'll be lookin to hard tail it

[LoHo]

I know this thread dried up a while back, but...

The bike idles great when warm. When I crack the throttle a tiny bit off of idle, it spits a time or two, but runs well after I get going. I can't help thinking she's a too rich, but my plugs say only a tad rich or normal.

Should I pursue synching again, float height, or something else? The engine and carbs are as stock as possible for a 45 year old bike.

[BA80]

How old are your plugs? I need to put new plugs in every year or it'll start doing that.

[LoHo]

Just so y'all know, my initial investigation revealed a split in the vacuum advance hose. I guess at low vac levels, the advance would not move and the bike sputtered; at higher vac, it ran okay.

[motoman]

Just so y'all know, my initial investigation revealed a split in the vacuum advance hose. I guess at low vac levels, the advance would not move and the bike sputtered; at higher vac, it ran okay.

Glad you found the problem Larry! Could of been a tad lean on #2 from that split also. May wanna reset idle mixes and re-sync.

[LoHo]

I took the timing cover off and it was split in there, too. Replacing the hose improved things, but I'll bet the timing cover split existed when I tuned the carbs. Where's that damned Carbtune? Oh yeah, still attached to the Kawi that will never run....