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| mr175 a few questions https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2136 |
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| Author: | mr175 [ Sat Jan 10, 2009 11:44 pm ] |
| Post subject: | mr175 a few questions |
My bike didn't come with a spark arrester, how will this effect the performance of the powerband? I seem to have slow low to midrange throtle responce. Is thier a basic way to rewire this bike? all I need is a kill switch no lights. thanks |
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| Author: | rayivers [ Sun Jan 11, 2009 11:19 am ] |
| Post subject: | Re: mr175 a few questions |
So you have the stock exhaust pipe, but it's missing the removable tailpiece section? On my bike, all I noticed was a bit more noise when I tried this - the powerband was affected very little. I'm not sure if I have a spare one of these, but if not, the pipes come up on eBay all the time. The tailpiece section is the second half of the spark arrestor; the first part is ahead of the large tube that the tailpiece fits into. If you look forward into the front of the tube, you'll see 6 or 8 openings arranged around the outside diameter, like a turbine engine exhaust - these are the spark arrestor outlets. If these are clogged (all of mine were either partially or totally stuffed with crap), you'll obviously have a huge drop in performance and throttle response. I cleaned mine out with heavy-duty sharp-edged pipe cleaners I got at a tobacco shop, and I also drilled out the center cone of the spark arrestor (in the center of the 'turbine') 1/2". This added midrange and top end, and increased the noise slightly with the tailpiece in place, without the tailpiece probably even more - but the actual muffler section is inside the pipe body so it won't make a gigantic difference. One of my pipes was really bad, so I pulled it off, soaked it in gas overnight, burned out the spark arrestor with a torch from the rear of the pipe, then finished up with the pipe cleaners - worked great. I found the stock 52 pilot (slow) jet too big - I use a 48 pilot now, along with a 118 main jet. It would also be worthwhile to check the compression and ignition timing. The yellow wire from the alternator (motor) is for the lighting - just leave it disconnected after taping it off. The black/yellow alternator wire can be connected to the black/white wire to the ignition coil, with another black/white wire running from there to the stock kill switch (the green kill switch wire goes to frame ground). Ray |
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