1982 Honda CB900F “Holly”

CALfeRacer

Fat man on a little bike
Cool, good to know. I'll focus on the carbs then, I suspect something is a little off w/ cylinder one. I noticed the header on cyl one is less blue at the flange than the other three. Or maybe 2-4 are running hot.
 

Maritime

Over 10,000 Posts
colder pipe can be fueling. I think I said earlier on my GL I had one cylinder with 0 fuel, it was as simple as the float needle seat being about 1 mm proud and the retainer being slightly bent causing the needle to foul and wouldn't open to let in fuel. So float height, plugged jets, sticky slide all can act like ignition issues LOL.
 

CALfeRacer

Fat man on a little bike
Playing with the floats and hoping to get a response before the carbs are back on...
Seems like the float heights are all super high. The manual I have lists 14mm for the CR, but I’m in the 20s and the float doesn’t sit even close to level at the point where it engages the pin on the float valve. Here’s a before and after of the tab, this is what I had to do to get 14mm just on the edge of the float closest to the float valve.
IMG_3051.jpg

IMG_3052.jpg

IMG_3053.jpg

IMG_3054.jpg

Is this too extreme or am I on the right path?
 

teazer

Over 1,000 Posts
DTT BOTM WINNER
Those float pivots sure were bent and twisted.

Before you fit the carbs back on the bike, check the FUEL levels on all 4. Float height is the substitute to get fuel level close, but I found that floats are rarely the same in terms of how they float - especially old brass ones, which you fortunately do not have to work with.
 

CALfeRacer

Fat man on a little bike
Well, the carbs are back on the bike and my problem seems to be fixed! Still idles good, runs good around town, will rip up to the ton getting on the highway, and will cruise at 75 easily and I can accelerate from there without issues.
Teazer, how do I check the fuel level cs float height?
 

CALfeRacer

Fat man on a little bike
Didn’t like how much wind I was catching on the highway so I decided to roll the dice on an EMGO fairing. Seems like it suits the style of the bike and I’m happy with it. Once I buy an expansion tank and spray gun it’ll get painted gray to match the tank along with the “new” tail and front fender. Haven’t gotten a chance to ride yet so verdict is out on how much it’ll help with the wind...
 

Attachments

CALfeRacer

Fat man on a little bike
Seems like the fairing is helping out with the wind, definitely taking a lot off my chest. The bottom half seems pretty secure but the top shakes quite a bit so I might need to think of a way to reinforce it. I have some random carbon strips so might buy some epoxy and glue a couple strips on before paint.
 

CarbsAndCylinders

Careful With That Axe Eugene
My 900F became a bit unstable at 100 mph and above when I used a Shoei fairng, after taking it off the bike was stable up to top speed. Have you had any high-speed stability issues? It may have been the design of my particular fairing and others, like yours, do not create this problem.
 

CALfeRacer

Fat man on a little bike
My 900F became a bit unstable at 100 mph and above when I used a Shoei fairng, after taking it off the bike was stable up to top speed. Have you had any high-speed stability issues? It may have been the design of my particular fairing and others, like yours, do not create this problem.
It felt fine taking it to 100+ before, but haven't gone over ~85 with the fairing on yet. Sounds like I have another excuse to ton up now!

UPDATE: Briefly got up to 100 on my ride to work this morning, didn't notice any instability. Wasn't there for long though.
 
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