death rattle? - with video

[kallsop]

Here's the story. The guts fell out of the original muffler and I rode the bike home, only a mile or so. All was fine, the engine had monster power then but also really noisy. I didn't abuse it and kept the revs low.

My son took out the bike without telling me, and he says he ran it for 10 minutes and didn't notice anything. I wonder about that!

Now I put on a replacement muffler. The muffler is super quiet, it has the welded end, but also is a power killer for sure. That's not the immediate problem though. Now the engine has a terrible rattle. Take a listen:

death rattle?

It sounds very bad and there's a lot more smoke than before. The clanging noise seems to be coming from the crank/clutch area. Before I start disassembling things, any thoughts on what I'm going to find?

 

[arceeguy]

The clutch design in these engines is inherently noisy, it is due to the clearance between the carbide ball bearings and the ring gear. They make the most racket when disengaged, but the metallic rattling will stop once the clutch is engaged.

 

[Hawaii_Ed]

It just did not sound that bad to me, I dunno. How does it ride?

 

[pdxrhett]

that chain seems to be hopping a lot for the clutch to be all the way in - maybe it is grabbing only a very tiny bit? try adjusting your clutch

 

[kallsop]

OK, so maybe it's just the clutch, but the noise is louder than it was before putting the new muffler on. Maybe I need to adjust the star nut and it's a coincidence that it got noisier the same time as the muffler escapade? I noticed the clutch might be grabbing very very slightly and will adjust that out. It doesn't show in the video, but the exhaust gasket is leaking now too.

BTW - I tried searching for a thread on how to get more power out of these welded end cap mufflers and came up empty. Anyone can recommend a good thread? First thought is to use a dremel to cut across the weld and pop off the end cap to see what's going on in there. The original muffler end cap was held on by two sets of nut and bolt, and had very noticeably more power, like 50% more.

 

[Mountainman]

not sure why -- because I don't see anyTHING

but it sounds like an exhast leak ??

MM

 

[biken stins]

Tie a rope on the kid and drag him untill he tells you what really happen.
Make it look like a accident.
Just kidding of course.

 

[linnix13]

OK, so maybe it's just the clutch, but the noise is louder than it was before putting the new muffler on. Maybe I need to adjust the star nut and it's a coincidence that it got noisier the same time as the muffler escapade? I noticed the clutch might be grabbing very very slightly and will adjust that out. It doesn't show in the video, but the exhaust gasket is leaking now too.

BTW - I tried searching for a thread on how to get more power out of these welded end cap mufflers and came up empty. Anyone can recommend a good thread? First thought is to use a dremel to cut across the weld and pop off the end cap to see what's going on in there. The original muffler end cap was held on by two sets of nut and bolt, and had very noticeably more power, like 50% more.

if you want more power then drill a 1/4" hole on the bottom of the baffle next to the original hole, the bigger the hole the more power but also the more sound, 1/4" is perfect for not being to much louder but alot more power

 

[thescooterguy]

i agree . i think the clutch is partially engaged , if you watch the chain and listen to the rattle you can see they have a rhythm . its probably worse now with the new pipe due to ,more power , that's my best guess.

 

[Nitropeewee]

ferget the can type muf go wit an expantion chamber youll never look back! louder but wroth it. mine came off a china type 50 cc four wheeler.