Re: Pop hrough exhaust
2000 Max with Super Trap slip-ons, 16,000mi.
Was riding today and noticed when you are cruising at any speed I was getting a pop through the exhaust on the left side. No stumble or miss that I could feel. Don't know how to explain really, you had the steady rumble and every so often you would hear a pop that was out of rythm. Any help or ideas would be appreciated!
Matthew:ummm:
Mathew, my Dad's just started the same thing except on the right side. Of course, it starts doing it the day after I tune it up for him lol.
Here are some things to check.
Drain the float bowls to the right-rear and left-front carbs. These cylinders feed the left exhaust. Look for any water, rust, dirt in there. Next, see if one of your choke plungers is stuck slightly open. Pull the plugs and see what they look like. Are they fuel or oil fouled?
How's the fuel filter? If dirty some crap might have squeaked by to clog the idle circuit to one of the carb(s).
Check for exhaust leaks, use hand to feel for slight breeze. Next, take "H" covers off sides and look for a hairline crack in the manifolds. They're made out of very soft metal. Mine had a crack where the "H" mounting hole piece meets the manifold. Air was getting in there and causing a slight pop. It ran great but was annoying.
Check all your rubber boots. Remove carbs and take each boot out of the clamps. Check carefully for hardness and cracks. Replace all 8 as a set. Check your air box velocity stacks in the same way.
Unscrew the mixture screws out of both carbs and them blow compress air in PAJ1...the screws will fly out so be prepared to catch them. Check the condition of the rubber o-ring on each screw. If it's hard, air might be getting by from the outside.
It's possible that one of your coasting enrichener plungers is stuck open causing a lean pop. Only way to get to all four enrichener covers to remove is to remove the carbs from the brackets. I would save to checking this last.
If all else fails, take out your mixtures screws, slides, purge jet o-rings. Squirt some carb cleaner in Paj1, PAJ2, and the 3 purge jet holes. Check the attachments I included. The 1st pic on the left carb shows the 3 holes. Some small wire would really help in cleaning these small jets.
Let us know how your checks come out.
Mark
#1098
