Join Date: Nov 2017
Location: Silver City, New Mexico
Exhaust Mod Causing Problem ??
1st - I well know some on this forum get upset & noisy at the idea of modifying a bike. Please keep your flaming to yourself. I went into this deliberately after careful consideration.
That said - I wanted a more positive sound from the exhaust of my '05 Wee and 1) can't afford an aftermarket muffler, and no assurance it'd sound the way I want, anyway, and 2) read about this on this forum and decided to try it - I took a long piece of rebar and ground a sharp taper onto an end, then inserted it into exhaust till it hit bottom. Carefully hit it with a heavy hammer and punched 3 equidistant holes in there.
It sounds a bit strange, compared to, say, a Harley exhaust, but much nicer than stock - to my ears. It's kind of a flat growl that's fairly quiet at low to moderate throttle and has a hard, flat rasp that I've grown to enjoy at high power settings. Can't hear it at all on the highway. Best of both worlds. :-)
I rode it like that for several months and enjoyed it. Later on, quite a few miles later on, I started getting a hesitation when cracking the throttle. When leaving a light, hit the gas and it'll go kinda....GAAAaaawwwhhOOOMM....if it doesn't die completely. Power is erratic and it hesitates before accelerating at any speed. Seems to be slowly getting worse and it's a pain to ride now. Quite a bit of reading on forums leads me to believe my TPS is bad, but bike only has ~<35,000 miles on it, so seems a bit early for that.
Putting it into dealer mode shows a readout of -C00 - dash in the middle at idle. It's very hard to start when cold - takes ½ dozen tries, but starts quickly and easily after that - it's 40º here now and warming to operating temp isn't practical - but the - dash shifts to upper position on C00 at about 2200 rpm when showing 1 bar on temp gauge. Idle is a bit lumpy at 1300 rpm. I did try adjusting idle speed with screw on the left side and it does make a difference, but doesn't cure the problem.
More reading and it may be possible for the change in exhaust back pressure could be affecting it. Before spending the money on a new TPS, I'd like to ask here if you-all think that may be a possibility ?? Plugging the punch-outs in exhaust and restoring it to stock will be easy with a 1" engine freeze plug.....but I hate to give up the nifty sound - it's just right. Whaddaya think ?? Again - please, no flaming on mod-ing the bike.