RdKryton
Active Member
Hello all.
I have been playing with a small issue with the 22mm carb on my Whizzer. I have (had) a little stumble just off the idle when going for moderate or strong acceleration. Not much of a stumble but very consistent. After it would get past the little stumble it would just flat out run so I figured it was just a matter of getting the correct jet size and setting the needle.
The original hi-speed jet was way to big. A #95 I think.
Now you may be thinking why is he playing with the hi-speed jet if it has a low speed stumble? Good question. Well to make a long story short the pilot jet, the needle, and hi-speed jet all effect each other to a certain degree. I have played with the air mixture setting, float level, and anything else I could think of but I could not make the stumble go away. Quenton has been a great help with his info and a selection of hi-speed jets to nail down the problem. I found as I went a little smaller with each jet the problem was getting a little better. The reason I started with the hi-speed jet is because it was running very rich almost to the point of it acting like the choke was on even when it was not. I didn't even need the choke to start it when it was cold.
I ended up going from the #95 jet down to a #88 jet. It does not sound like much but of a decrease in size but what a difference it has made with the Whizzer. The idle is perfect and the stumble is 99.9% gone too. Every once in a great while it will hic-up but not enough for me to worry about it. The performance now with the correct jet is just all I could hope for with such a small engine. I got a chance again last evening to get out and ride. Wow. I can make the belts squeal even though they are new and tight. The power comes on and it just keeps wanting to go faster and faster. I am very happy with the way it runs now. A big thanks goes to Quenton and all his modified parts. I don't have all the possible mods but I have enough to make me smile As soon as I loose some more weight I'll be able get the most out of this bike.
The moral of this story is make sure you have the right jets in your carb. It will make a night and day difference in the way it runs and if you are running too lean, you will damage your engine. Being too rich can be bad too because of all the raw fuel. It can wash the oil off the cylinder wall causing excessive wear to the rings and cylinder.
Well that's it. Good luck everyone and ride safe.
Jim
I have been playing with a small issue with the 22mm carb on my Whizzer. I have (had) a little stumble just off the idle when going for moderate or strong acceleration. Not much of a stumble but very consistent. After it would get past the little stumble it would just flat out run so I figured it was just a matter of getting the correct jet size and setting the needle.
The original hi-speed jet was way to big. A #95 I think.
Now you may be thinking why is he playing with the hi-speed jet if it has a low speed stumble? Good question. Well to make a long story short the pilot jet, the needle, and hi-speed jet all effect each other to a certain degree. I have played with the air mixture setting, float level, and anything else I could think of but I could not make the stumble go away. Quenton has been a great help with his info and a selection of hi-speed jets to nail down the problem. I found as I went a little smaller with each jet the problem was getting a little better. The reason I started with the hi-speed jet is because it was running very rich almost to the point of it acting like the choke was on even when it was not. I didn't even need the choke to start it when it was cold.
I ended up going from the #95 jet down to a #88 jet. It does not sound like much but of a decrease in size but what a difference it has made with the Whizzer. The idle is perfect and the stumble is 99.9% gone too. Every once in a great while it will hic-up but not enough for me to worry about it. The performance now with the correct jet is just all I could hope for with such a small engine. I got a chance again last evening to get out and ride. Wow. I can make the belts squeal even though they are new and tight. The power comes on and it just keeps wanting to go faster and faster. I am very happy with the way it runs now. A big thanks goes to Quenton and all his modified parts. I don't have all the possible mods but I have enough to make me smile As soon as I loose some more weight I'll be able get the most out of this bike.
The moral of this story is make sure you have the right jets in your carb. It will make a night and day difference in the way it runs and if you are running too lean, you will damage your engine. Being too rich can be bad too because of all the raw fuel. It can wash the oil off the cylinder wall causing excessive wear to the rings and cylinder.
Well that's it. Good luck everyone and ride safe.
Jim
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