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Post by hollywoodscootin on Feb 2, 2011 14:44:12 GMT -5
So I decided not to even tinker with the fuel float yet. i went on a distance haul for work yesterday. 74 miles each way! When I got home I noticed that the scoot must have vibrated so much that both muffler mounting bolts shook loose and fell out. This morning I totally forgot about them and when I was headed to work, I hit a bump :swear: and the muffler broke off. The remaining short piece of header pipe is still there. It sounds loud as sin. How can I reattach the muffler? or do I need to buy a new exhaust? and if i buy a new exhaust, I'll have to tune my carb to it correct? but if ya'll dont remember, my air/fuel screw is covered by a metal blank. someone told me to take a drill and carefully drill a small hole in the cover, then thread a sheet metal screw into it and use pliers to yank it out. i wanted to get a second opinion before i f'ed up my carb. also why does my scooter bog for a moment when i am haulin @$$ down a hill? is it because too much pressure building up in the engine? my scooter seems to be blowing oil. I fill up the oil and it seems to empty faster than normal. fox--- the guy you bought that bbk from, was he legit? did he still have the intake boot and exhaust? |
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Post by 90GTVert on Feb 2, 2011 15:05:20 GMT -5
The on;y good way to reattach that muffler is to have it welded. It should be a fairly simple job, so I'd get a price on it from a local welder or muffler shop before buying something new. If you do buy a new performance pipe, it's likely you will have to upjet and may or may not need to adjust the idle mixture. The process described to you sounds about right.
I'm guessing you have no idea what it's revving going down the hill? These little things aren't meant to rev to what they could possibly reach downhill. Makes me wonder if you have felt valve float. Where's the oil going? Is your air filter oily or o you have a catch can that's filling up or....? You could try making a breather or catch can setup to see if that helps.
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Post by hollywoodscootin on Feb 2, 2011 15:26:31 GMT -5
Once again, thank you Brent for the valuable advice. Now to go downstairs and take the rest of the exhaust off and head to the shop...
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Post by Fox on Feb 2, 2011 17:55:23 GMT -5
I have a used pipe I'll sell you for $25.
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Post by Goosey on Feb 2, 2011 18:13:02 GMT -5
My Baron was always losing her darn exhaust bolts. I think I have slightly longer bolts with lock nuts on now. Check for thread stripping from them vibrating loose. Those, and kick start levers were always clanking down the road in inconvenient places.
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Post by hollywoodscootin on Feb 3, 2011 19:55:17 GMT -5
@ FOX- Thanks a million for the info when I called earlier. It fit like a glove.
UPDATE- the exhaust is fixed. sounds quieter than brand new. runs a little better too. however when I took it out for a spin, one of the nuts on the header fell off. doesn't really affect performance that much as I can tell...
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Post by 90GTVert on Feb 3, 2011 20:18:57 GMT -5
I use 2 nuts per stud on my headers to keep 'em locked in place.
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Post by lackthereof on Feb 6, 2011 6:16:07 GMT -5
These things will spin over 9000 RPM on even a mild downhill slope if you keep it wide open. When that hitching/bogging occurs it's, usually a good sign that you're going a bit too fast. I'm not sure what causes it, but I have a hunch that it reaches the flow limit of the inlet valve in the carb; it can't keep the float bowl full and suddenly leans out. It doesn't happen at a consistent enough RPM to be an ignition limit (I think), and it doesn't feel or sound like valve float. No matter what causes it, it's a sign you're way outside of the RPM range the engineers had in mind. I hooked a tach up to my scoot for hill-climb CVT tuning, but never really looked at it at-speed. Then one day, I was going downhill full steam ahead and felt it do the hitching thing. I looked down at the tach, saw 9600  , and just about had a heart attack. I started watching my speed on downhills right away. I had always just assumed that there must be a rev-limiter built in so I didn't need to worry about it  |
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Post by lshigham on Feb 6, 2011 8:49:48 GMT -5
These things will spin over 9000 RPM on even a mild downhill slope if you keep it wide open. When that hitching/bogging occurs it's, usually a good sign that you're going a bit too fast. I'm not sure what causes it, but I have a hunch that it reaches the flow limit of the inlet valve in the carb; it can't keep the float bowl full and suddenly leans out. It doesn't happen at a consistent enough RPM to be an ignition limit (I think), and it doesn't feel or sound like valve float. No matter what causes it, it's a sign you're way outside of the RPM range the engineers had in mind. I hooked a tach up to my scoot for hill-climb CVT tuning, but never really looked at it at-speed. Then one day, I was going downhill full steam ahead and felt it do the hitching thing. I looked down at the tach, saw 9600 , and just about had a heart attack. I started watching my speed on downhills right away. I had always just assumed that there must be a rev-limiter built in so I didn't need to worry about it I had a 139QMB with a rev limiter at 5200rpm! My two stroke will spin up to 13000 if you really thrash it. Not having a death wish I don't do it very often. |
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, and just about had a heart attack. I started watching my speed on downhills right away. I had always just assumed that there must be a rev-limiter built in so I didn't need to worry about it 