Amal Premier pilots have grooves on the ends. That leaves massive amounts of needle tuning which can really only be done by the person whose bike it is. Even though it ran fine in the middle possition, it runs throatyer it the richer position. The pilot fuel screw meters fuel, so turning it clockwise/in will lean the fuel/air mix, while turning it counter-clockwise/out will richen the fuel air mix. Let’s define the carburetor butterfly or slide the dividing line between the air box side, and the engine side.
It idles strong now with the mixture screw out 1 1/2 turns out. So, I checked out the float. As usual, the correct diagnosis is half the battle! A pilot air screw will be located on the air box side, while a fuel screw will be located on the engine side. Of coarse I have a timing light.
I should have copyrighted it..., Copyright, then print & distribute , everyone could benefit from one in their tool box. Time the runs. 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. Back on the bike, with gas going to it, I found that the tickler would bearly move the float. The air screw can actually be effective down to about half turn out. How do you determine the size of the jet you have? Some finess was required to make a new flare, but anything is better than the crap they passed at the factory. I didn't even notice, realize you wrote it. It was set about a 1/4in low. Tremendous improvement, better than I expected. How could it be the coils? I now I replaced the coils some tme in the past wih stock new ones. The new carb was obviously running too lean at idle.
15 1 ring Leanest? Moving the clip and or different straight diameters will change the time it takes, at the same throttle position to 'make the run'. The flared roll pin was very poorly flared and jagged. I put a .019 idle jet in it, up from the stock .017, skipping the .018 because it was idling very lean. It was set about a 1/4in low. Here is a short video I put together to help explain this information along with a FUEL screw adjustment procedure. Off idle heavy feel or sputter.
Please note, comments must be approved before they are published, Triumph Motorcycle Inspired Shirts - Choose Shirt Style / Color / Size, 1950 BSA A10 Goldenflash Motorcycle T-Shirt, BSA Vintage Empire Star Motorcycle T-Shirt, ALL ORDERS SHIP SAME DAY BEFORE 12PM (PST) - DUE TO COVID-19 EXPECT DELAYS ON ALL DOMESTIC & INTERNATIONAL DELIVERY DATES, Create Account or Log In (No Account Needed To Order), Runs better when air screw is screwed all the way out, Should you have a lean condition, you must install a larger pilot jet, Should you have a rich condition, you must install a smaller pilot jet. Lightly seat the fuel/air screw and set to factory settings as a baseline. I am thinking now, maybe the coils arn’t liking the compression load with the new carb.
By the time I was done setting and checking throttle response, I was only 1 turn out from seat.
By the time I was done setting and checking throttle response, I was only 1 turn out from seat.
For example # 19 has 3 rings, does a #17 have 2 rings or 5 rings? If your fuel screw is in further than 2 turns, you need a leaner pilot. The engine was overhauled 10 years ago and still has great compression.
If these change, you may have to change jetting to suit. How could it be the coils? Oil being in the fuel has to change things quite a bit. Anyway, once it’s past the bog it’s on it’s way to doing 100mph with no problem. Your email address will not be published. They sure are handy for mapping 4 strokes though i guess.... A good dyno supports steady state loads, you can check a/f mix at any RPM/load as well as accel/decel...etc. I haven't had the chance to look into the actual jetting yet, but I did go through the proper setting of the air screw and I have certainly found more power. I look forward to it tho. I am thinking now, maybe the coils arn’t liking the compression load with the new carb. The slide is a 3 1/2, correct for a tr7v. You will find that a few needles or clip changes do not seem to do anything to your time.
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In addition, if the fuel level is set too high in the float chamber, a rich mixture will result. Mark the grip so you know where you are in relation to ho open the arb is (1/8 incements from closed to fully open is enough). Revving the engine in neutral will result in RPM dip below idle RPM, RPM’s will drop quickly. Out of the box, I installed it and of course it ran like crap. Copyright© ThumperTalk, Inc. - All rights reserved.
Is a #17 leaner or richer than a #19? Was this information helpful? https://thumpertalk.com/topic/347305-is-your-two-stroke-running-rich-read-here/. Liked it?
There are carb models that have both a fuel and air screw, however I actually have never worked on one in 20+ yrs of wrenching. I've been a gear head for years but never messed with a carb, ever. Even though it ran fine in the middle possition, it runs throatyer it the richer position. Bendable tangs on the new style float worked to adjust it to where it ought to be.
Copyright © 2020 How-To Motorcycle Repair. Thanks again. leave the jetting on the rich side.
It idles strong now with the mixture screw out 1 1/2 turns out. And I try to jet my bike so that it' at it's most responsive at about 1.5 turns out, but different people have different preferences.
Amal Premier pilot jets come in increments of 2.. Changing the pilot jet on a new Amal Premier or Wassell Evolution carburetor is quick and easy and allows you to fine tune your motorcycle like never before, Perfect does not exists, however getting your pilot jet "close" is possible but there will be a sacrifice. Required fields are marked *. It can be done off the back of the truck, in between trails, and when you find that magic combination you are in heaven. A pilot air screw will be made of brass, gold in color, and will have a blunt tip compared to a pilot fuel screw. Unless its fast outdoor mx, most people splend 95% of every ride on the jet needle and there is literally no way an oxygen sensor is going to tell anything about a carburetor on a 2 stroke. That keeps the fuel passages from getting fuel when there is a big change in "G" force, like a jump or whoops. I’ve had this bike over thirty years and have put plenty of point sets in it. Keep good notes. Take a second to support Matthew on Patreon! http://www.dragonfly75.com/moto/NeedleHeight.html, You need to be a member in order to leave a comment.
I put all new gaskets on the intake manifold just to be sure. I complete grasp the concept although I think the human factor may introduce far too many variables to keep things accurate. I had actually felt a bit of power loss, groggy, tiny bog going on and this remedied it immediately.
Revving the engine in neutral will result in hanging RPM’s, or RPM’s will slowly drop back to idle RPM. Contrary to a couple previous posts, a dyno with a WB O2 sensor is the most accurate way to dial in the jetting. This symptom of a lean or rich condition is quite common on any carburetor, however, those that have the new Amal Premier carburetors or Wassell Evolution carbs will have the liberty of fine tuning the pilot circuit by swapping out the "removable pilot jets" Wow. Too lean feels fluttery and weak. Re: Am I lean or rich on the pilot jet? This adjustment will trim the mixture so that you can have a smooth running engine. I haven't had the chance to look into the actual jetting yet, but I did go through the proper setting of the air screw and I have certainly found more power. Moving the float down to tickle better was not working. 19 3 rings If you can’t find the screw, it may be hiding under a welch plug. It has crossovers. This symptom of a lean or rich condition is quite common on any carburetor, however, those that have the new Amal Premier carburetors or Wassell Evolution carbs will have the liberty of fine tuning the pilot circuit by swapping out the "removable pilot jets".
Thank you for the thorough responses. If engine bogs or hesitates during acceleration, richen idle screws 1/4 to 1/2 turn and see if that helps. That leaves massive amounts of needle tuning which can really only be done by the person whose bike it is.
A few years ago I put in Boyer ignition. Anyway, once it’s past the bog it’s on it’s way to doing 100mph with no problem. I very much look forward to learning and teaching.
Symptoms can be a rough running engine (bogging), a … Enter your name and email to get notified when new content becomes available. If you move the needle up or down then you change when the needle taper kicks in which may make the beginning jetting too lean or too rich. I put a .021 idle jet in it, up from the stock .017, skipping the .019 because it was idling very lean. Reset idle to recommended settings and test ride motorcycle. I put all new gaskets on the intake manifold just to be sure. Tickeling is immediate now and the float is dead on. I put a new premier 900 on my tr7v because the bore was worn out.
Your goal is to make the run, at the steady throttle position, in the shortest time. The best part of this short video is the concise DIAGNOSIS of idle jet problems.Ari details the classic symptoms of this very vexing issue.
At least on a 4 stroke dyno tuning is the most accurate method. I now I replaced the coils some tme in the past wih stock new ones. The slide is a 3 1/2, correct for a tr7v. Rich: A "rich" condition is what occurs when you have too much fuel in your fuel/air mixture.
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