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Keeping Spree Elite Aero 50cc and Gyro Alive!
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PostPosted: Sat Apr 14, 2018 12:17 pm 
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Goped
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Location: Lincolnshire, England
Anyone come across this? There's a small (1/8") hole drilled at the lowest point of the header on my Suzuki AE50. At first I thought it was a leak but it looks deliberate. I blocked it with a screw and it now won't start or idle as easily. Maybe it's there as a drain?


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PostPosted: Sat Apr 14, 2018 12:37 pm 
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CB900F
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People have been known to drill hole(s) in the rear chamber of their stock exhausts in search of a performance gain. This practice typically nets no noticable improvement and in some cases hinders the bike’s ability to run at the peak of the manufacturer’s intended design.

Other times, holes are drilled to try and remedy running issues caused by other problems like a carbon caked (plugged) exhaust, maladjusted carb, many others....your hole may be the result of a shoddy “band-aid” repair done by a backyard mechanic to mask the REAL issue of a poor running condition. This would explain why when you plug the hole, it runs like junk.

Its certainly not a drain hole and should be plugged with a bolt, weld, etc...then investigate why your scoot is having issues.

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PostPosted: Sat Apr 14, 2018 12:43 pm 
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Unless the hole you describe is the mounting point of a missing heat shield. Either way, should be plugged by a bolt..


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PostPosted: Sat Apr 14, 2018 1:07 pm 
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Goped
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Nope, it's a really small hole and looks to be at the lowest part of the header on purpose. I've put a self tapping screw in for the moment and will get the pipe off to investigate further once I've been through the UK road worthiness (MOT) test. This scoot has not been on the road for quite a few years so has a fair build up of gunk in the pipe and it's quite smoky. I'm fairly sure it would fail the MOT test with even a small amount of smoke coming from underneath.


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PostPosted: Sat Apr 14, 2018 1:51 pm 
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Total speculation here: Previous owner likely drilled the hole for reasons only he knows, but likely seeking better exhaust flow.
In doing so, there may have also been some changes in jetting or airbox restrictions.
Now, with hole plugged, tune has changed and you must discern if other factors need to be rectified in order to achieve
an happy engine. MAYBE the "muffler" is somewhat clogged with oil build-up, and the P.O. drilled the hole rather than clean the muffler. Seems likely. Now with hole plugged, engine is struggling to push exhaust. Good luck sir...let us know what you find please... :urban:

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PostPosted: Sun Apr 15, 2018 3:21 am 
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Goped
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Location: Lincolnshire, England
It's amazing that such a small hole can make what seems to be a major difference in starting and idling, I made no other changes, but it will be quick & easy to check. There is a repair on the header pipe a bit further along toward the muffler, it's wrapped with exhaust repair tape that's set hard, again I need to leave that until the scoot is MOT tested, it's not visible from above and should be fine for the MOT test in any case.
In the meantime thanks for all the feedback folks, it'll be a couple of weeks before I can report back as I want to wait until May to get the scoot tested for using on the road. I want to get some miles on my Honda Vision (Aero) during April too.


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