My engine is popping and throwing flames out the carbs. Idle is fine, but asyou crack the throttle the engine loses power and starts to pop out of bothcarbs. I checked the float level many times and I THINK it is correct,about 18 mm. Timing and dewell have also been checked. The fuel in theventuri's looks as if its being pushed around in different directionsinstead of sucked down. I dont think its mech because it doesnt do this at2000 rpms. Electrical?? Does this sound like a coil??? thanks
Dear Bud, Check to see if the carbs are injecting from the acclerator nozzles. Ifyou look down the carb bore when you move the throttle linkage from idle tofull you should see some raw gas being squirted from these nozzles, if notthe engine will hesitate and stumble. You did not say what kind of motor youhave but if the carbs are Zenith its .25-.35 cc per 2 full strokes and aSolex P11 is .55-.65 per Two strokes. The eyeball calibration is look downthe carb bores and they should squirt for a couple of seconds on a one fullstroke.Sincerely,Alan,The Stable, San Francisco
There are many possible causes of this. The first thing to do is besure the basics are right.
After Absolutely determining TDC on #1 Cylinder, DOUBLE Check theFiring Order 1-4-3-2 in Clockwise Order on the Distributor cap. Swappedplug wires is the #1 Reason for Bad Backfires on both carbs.
Pull the Plugs and replace them if they're wet or black. Check fordinged-over tips on extended tip plugs.
Check the Valve Gap (0 or negative gap on the Intake Valves can causebad backfiring). While there, check for a broken valve spring or a seizedvalve that has a 1/4" gap on the push rod.
Report what you find and:
Keep the 356 FaithMaestro
What do you do for dinged over tips on spark plugs? I am using W6B (?) Bosch and noticed that I get one of my tips dinged over. I have a rebuilt normal with Shasta pistons and barrels and normal heads that have been "cut" for the Shasta pistons.
Here are the things that I also did
Checked wires for firing order many times
Adjusted the valves
No dings on plugs
Rebuilt fuel pump and check quantity of output
Cleaned carb,,,jets ,,emulsion tubes etc
Checked timing and the advance,,about 5BTDC at idle and about 31@ 3500
----- Original Message -----From: "Harry Pellow" To: <email@example.com>Sent: Saturday, April 07, 2001 3:51 AMSubject: re: Popping and Flames
> Bud wrote:asbothatcauseseized
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