Magnum still not running ... update 1/24 By ger42 (Read 1,241 times)

[ger42]

I drained the tank cleaned it out with CLP put new hoses on. It started after a few tries but I twist the throttle it dies, hit the starter right after it dies and it starts with just a touch.
I did not drop the bowl but I did drain it out. It will idle until I kill it. I installed 2 new fuel filters back to back.
What you guys think? Not about me the problem I'm having with the trike.

[Alleyoop]

It is all fuel delivery problem.
Follow this procedure and see if it acts better.
Alleyoop


ADJUSTING YOUR FUEL RATIO MIXTURE:

YOU WANT THE HIGHEST RPMS OUT OF THE AIR RATIO MIXTURE SCREW:

Start your scoot and Get The Engine Nice and Hot about 5 minutes so that the Enricher IF it has one is no longer Allowing Extra Fuel to come in. Then do the following to fine tune the Fuel Ratio Mixture:

FUEL RATIO SCREW:

FIRST TRY RICHENNG THE FUEL MIXTURE FROM ITS CURRENT SETTING:

RICHEN THE FUEL RATIO MIXTURE:
1. Turn the Fuel Mixture Screw COUNTER CLOCKWISE 1/4 of a turn and wait 10 seconds to let the engine catch up with the new setting.
a. If the RPMS go up REPEAT #1 UNTIL the RPMS GO DOWN OR NO CHANGE(then go to b).
b. TURN the Fuel Ratio Mixture Screw CLOCKWISE 1/8 and that should be your highest Fuel Ratio Mixture setting—GO TO #3.

******If on the FIRST 1/4 TURN from the STARTING Position IN #1 ABOVE the RPMS GO DOWN OR NO CHANGE , turn the Fuel Ratio Mixture Screw Back the 1/4 turn to the Starting position and wait 10 seconds until the engine catches up -- GO TO #2 ******


LEAN THE FUEL RATIO MIXTURE:
2. Turn the Fuel Mixture Screw CLOCKWISE 1/4 of a turn and wait 10 seconds to let the engine catch up with the new setting.
a. If the RPMS go up REPEAT #2 UNTIL the RPMS GO DOWN OR NO CHANGE(then go to b).
b. TURN the Fuel Mixture Screw COUNTER CLOCKWISE 1/8 and that should be your highest Fuel Ratio Mixture setting—GO TO #3.



IF YOU GOT TO THIS POINT AND NOT INSTRUCTED TO GO TO #3 THAT MEANS THERE WAS NO CHANGE IN RPMS FROM DOING #1 or #2 ABOVE, IT IS TIME TO CLEAN THE CARB:

YOU NEED TO CLEAN YOUR PILOT JET AND PASSAGE AND AIR PASSAGES AND THEN START FROM #1 AGAIN.


IDLE SPEED SCREW:
The Idle Speed Screw on a Carb that are on most 4Ts you will find on the right side on the THROTTLE CONTROL WHEEL. It is the screw with a SPRING on it.

To Lower the IDLE you turn it COUNTER CLOCKWISE to Raise the IDLE you turn it CLOCKWISE.

3. If after adjusting your Fuel Ratio Mixture your idle is to fast Turn the IDLE SPEED SCREW COUNTER CLOCKWISE. For the 50s-150s they like to idle around 1500-1800rpms, for the 250s+ they like to idle from 1800-2000 rpms, pick the smoothest idle with the rear wheel not spinning ---GO TO #4.


TEST YOUR ADJUSTMENTS:
4. Now give the Throttle a QUICK twist and the RPMS should climb up quickly without hesitation or bogging and come down to where you set your Idle at---GO TO #5.


5. NOW take a ride and try it out, the Fuel Ratio mixture may need a tweak in either direction now that the motor has a load on it.

The tweak will be minor maybe a ¼ turn richer or leaner IF it acts up with a load---GO TO #6


6. When it acts up BACK OFF the throttle about ¼ of an INCH AND HOLD IT THERE:

a. If the motor speeds up it is LEAN you need to richen it up a little.

b. If the motor settles down and or stumbles and then settles down it is RICH you need to LEAN it out a little.

GO TO #5 AGAIN.



Problems with the IDLE:
1. Give the throttle a quick twist:

A. If the rpms drop below idle speed, then recovers (or stalls), it is RICH —Turn the Fuel Mixture Screw Clockwise ¼ turns at a time and go to #1.

B. If the rpms do not drop quickly to the idle speed but hang and drop slowly it is LEAN —Turn the Fuel Mixture Screw Counter Clockwise ¼ turns at a time and go to #1.

[ger42]

I shall follow your instructions tomorrow.
"I'll gladly repay you next Tuesday, for a hamburger today".

[rapidjim]

I don't think a carb adjustment is going to fix your problem but, it might. If after you try it and your machine still acts up off idle, I would suspect that the idle jet is slightly plugged. The idle jet is not only for idle but also for transision to off idle and up. With the jet out make sure that you can spray carb cleaner thru it. Also do not use a jet drill on the idle jet. There is a fine cross wire built into the jet and if you drill it out it won't work.

One other possiblity is valves need to be adjusted. I really don't think that is the issue but is possible.

Jim

[mike6736]

Wow.... Good you got the tank clean and new in line filter. Both are right but I would pull the carb and open it and clean it and also check the spacer on the intake manifold it is plastic and may be cracked, very hard to see sometimes. But first and most clean carb and make sure jets are free and float is adjusted properly. Once you get it running follow the stepts Al put up there. Rin Sea Foam init as works fine here in Florida

Magoo

[kz1000st]

I would start it and while it idles listen for hissing noises. It sounds like a displaced vacuum line or leak somewhere. Spraying around the carb with WD-40 and seeing if the engine revs will tell you.

[ger42]

Took carb off cleaned it all out reassembled started up after gas got to the carb. Twisted the throttle and it revved. Let it run for a few minutes and I noticed anti freeze on the ground. Looked around and finally found the lower clamp on the radiator was loose. Took forever to get it on an angle so I could tighten it. Now I need to fix front faring I cracked when I rolled the trike off my ramps. Always something.

Mike6736 pictures of your new rear end (trike).

[mike6736]

Pictures comming.. Not much to see as all looks the same only changes made are all the roller bearings in swing arms now solid and in hub rollers replaced with bearings not rollers and grease fittings so this never happens again. First thing to remember is when trike was made none of the bolts and sleeves were properly fitted, sloop every were.... Man it rides nice now... have almost 100 miles on it and will be removing the bolts on the swing arms to to drill new grease fittings as a couple of them had to be re pressed to fit. Wanted to ride it so every things is were it wants to be and now can drill and tap new fittings on the swing arm mounts to frame. The ride is great at 65ph but still have the deck off till the fittings are complete

Mike