Carby Keihin carb clone

Ok now I have drilled down to a #76 bit from a #74 bit on my main jet and lost power, it's a bit colder than it has been too. I didn't go more then 2 blocks in fear of damaging the engine. Here's the plug after the sort run, doesn't do much good with such a short ride but maybe it'll help. Plug is a NGK B7HS
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It's really expensive but you will not get the full potential of your motor without it

No, I disagree. No need for high octane race fuel with these motors unless you have some sort of a rocket science racing rig. If you do, you know enough not to ask the question. If you have to ask the question, you don't need high octane. Make sense?

SRPM, we cannot see deep enough down into the plug to see the smoke ring. You did the right thing, staying on the side of caution. You are looking for a brown smoke ring down inside that electrode insulator. The cold also makes it run lean.
 
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I think the only time you need higher octane fuel is if you pinging or detonating, right? But boy me loves the smell of some turbo blue race gas! They still sell it?
 
Hey so does anyone happen to know the float height for this i messured im getting about 20 mm and i think thats wrong but im not sure
 

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dont measure. stick clear hose on bowl drain, loosen drain screw, hold hose against side of carb...adjust float until fuel is 1-2mm below bowl gasket. simple.
 
Do these carbs have a low speed adjusting screw? With a reed valve if you want to get the most out of it you need to window the piston.
 
I made a thread more vague about this so I'm making a new, more specific post.
So I'm looking for anyone that has used one of these clones with any info they can provide. Mainly I'm looking for jets for it and like tunning advice for the dang thing. Here are a couple pics to show what it looks like and show what markings are on it.
Hello let me share my experience with this clone let's start by saying I'm at sea level in Sunny South Florida my back is equipped with a high compression head and expansion chamber and high performance CDI and a port and polish cylinder with the transfer port. I have try 110 octane fuel and 92 octane fuel, I have try the stock spark plug and the NGK spark plug, I have try an piston with no hole and a piston with a hole in the side I have try 32 tooth sprocket and 36 tooth sprocket. The motor run very well, low end power is very good the bike cruise very well at 38 miles per hour with an 36 tooth sprocket, I haven't really tried to top it out because it's still in the break-in period I got about a total of 125 miles on the back so far and the fuel ratio is 25 - 1 the Clone really made an improvement in the performance of my bike. I reposition the needle for a richer mix, I find tuna just met with the air and fuel mixture screw, the idle screw never showed any type of affect. I used throttle cable adjustment to adjust the idle speed, maybe I just been lucky
 
I am going with a Mikuni VM Series Round Slide Carburetor 18MM Clamp Mount | VM18-144-WP. It is fully adjustable even has a low speed adjustment. If you have to use the throttle cable to adjust the idle speed something is not correct.

Seems know on know is if it has adjustable low speed or not as I have asked.
 
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