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| 74 mt125 exhaust question https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2865 |
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| Author: | shinysideup [ Thu Nov 11, 2010 6:48 pm ] |
| Post subject: | 74 mt125 exhaust question |
there is a little oval opening with 2 bolts on either side on the under side of my exhaust. it looks like a plate and gasket bolt on there. does anyone know the purpose of this hole? i dont have the plate on it right now, could that be causing any problems other than putting oil all over my frame? |
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| Author: | rayivers [ Thu Nov 11, 2010 7:28 pm ] |
| Post subject: | Re: 74 mt125 exhaust question |
It's a clean-out cover, directly below the entrance to the spark arrestor. The idea is to poke and/or burn the spark arrestor clean, but it's not all that easy to get to the far-side openings. The MT125 pipe is extremely restrictive even when clean. As an experiment, try removing the cover and see how the motor runs (it will be louder, of course). I cut a large slot in the baffle that runs across the middle of the clean-out opening, drilled a few holes diagonally through the spark arrestor and rear baffle plate, and ran a giant drill into the tailpipe (from behind the bike) which dug into and removed a thin inner reducer sleeve; the tailpipe was unaffected. The pipe was louder, but the motor came alive - it revved quicker and had noticeably more top-end power, with a little less bottom end. Ray |
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