A dyno cant tailor jetting for anyone. A buddy of mine has a small 4 wheeler dyno, maybe I'll try that. Is a #17 leaner or richer than a #19? Here is a short video I put together to help explain this information along with a FUEL screw adjustment procedure. It has crossovers. I put a new premier 900 on my tr7v because the bore was worn out. Of coarse I have a timing light.

I had actually felt a bit of power loss, groggy, tiny bog going on and this remedied it immediately.

It purrs at a low idle. You will find that a few needles or clip changes do not seem to do anything to your time. That keeps the fuel passages from getting fuel when there is a big change in "G" force, like a jump or whoops. A rich pilot setting will result in hard starting, plug fouling at low RPM’s, sputtering as the throttle is cracked opened. This is true for most carburetors. What you are after when adjusting this screw, is too reach peak idle RPM and smoothness. To remedy, clean your air filter, have your mechanic check the exhaust and …

Tickeling is immediate now and the float is dead on. Rich: A "rich" condition is what occurs when you have too much fuel in your fuel/air mixture. It has crossovers.

17 2 rings I put all new gaskets on the intake manifold just to be sure. In addition, if the fuel level is set too high in the float chamber, a rich mixture will result.

Big thanks for that.

I’ve seen the pilot air screw on the engine side on most Amal carburetors. Revving the engine in neutral will result in hanging RPM’s, or RPM’s will slowly drop back to idle RPM. BUT, it sure runs different from the old Amal. The problem is it still has a bog, as if an acceleration pump is no good, which it dosen’t have.

It runs like the bat from hell, but I get a momentary bog under hard acceleration. This is the engine telling you it is happy, and it runs best at this mixture. Adjusting your pilot jet on a new Amal Premier Concentric carburetor is very simple, In fact, all you need is a flat head screw driver and a sense of how the motorcycle is “responding” to your current jetting and on going adjustments, The rule of thumb when adjusting the mixture screw is a “turn and a half out”, You must turn the adjusting screw all the way in until it stops, mark it’s current location then back out 1 1/2 turns, Remember a 1 1/2 turns out is a rule of thumb, you may have to adjust the screw (in or out) more to find its “sweet spot”, There are 2 types of conditions when working with pilot jets (and all jets as well), I like to throw in an extra condition that happens to be in-between lean and rich, This in-between mixture is ideal as an overly lean or rich condition can cause some serious issues, A rich condition in the pilot jet circuit usually offers a few different signs, A lean condition in the pilot jet circuit usually offers a few different signs as well, Should you have a new Amal Premier carburetor the fix for a lean or rich condition on the pilot circuit is now easier than ever before. Next a plug read (color).

I’ve had this bike over thirty years and have put plenty of point sets in it. 15 1 ring Leanest? Turning the fuel screw all the way in will not stall the engine. Copyright© ThumperTalk, Inc. - All rights reserved. The flared roll pin was very poorly flared and jagged. The proper way to tune a fuel/air screw is to make adjustments on a fully warmed up engine and at LOW RPM. Off idle heavy feel or sputter. This adjustment will trim the mixture so that you can have a smooth running engine. Some finess was required to make a new flare, but anything is better than the crap they passed at the factory. Your email address will not be published. Liked it? Was this information helpful? It never used to bog with the old carb. I very much look forward to learning and teaching. The pilot air screw meters air, so turning it clockwise/in will richen the fuel/air mix, while counter-clockwise/out will lean the fuel/air mix. How-To: Size Your Pilot Jet, Pilot Screw Explained, 8 MUST Have Modifications – Harbor Freight Blast Cabinet, How-To: Prevent flash rust on metal parts, How-To: WOOD DIY Vapor Blaster Plans 42×30, How-To: MRCOOL DIY Mini Split Installation, How-To: Honda CB750 Carburetor Rebuild 1969-1976. Amal Premier pilots have grooves on the ends.

The engine was overhauled 10 years ago and still has great compression.

Like William1 said, find out where in the throttle your problem is, and start there. Re: Am I lean or rich on the pilot jet? Squeezing it in, and removing it I found the best way to extend its travel was to sand down the end of the button so it travels farther before it hits the stop. It was set about a 1/4in low. Tremendous improvement, better than I expected. This is borderline needing to jet down, correct?

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