Post by Scooter Doc on Apr 25, 2010 4:33:46 GMT -6
Very nice link as usual Alleyoop. These boxes are the ones commonly used on newer "racer" type models like the one shown. They sit under the front of the seat connected to the carburetor via a cumbersome hose that usually develops a kink in it. The inlet holes are underneath the box and not visible on these photos. If you drill more holes for air flow it will start to run lean and new upgrade jets would need to be installed to compensate, just like going to a Uni filter. Bashan reports that he hates these boxes and is replacing his with a Uni filter when he redoes this scooter in the near furure. Scooter Doc.
Post by Scooter Doc on Apr 25, 2010 3:51:56 GMT -6
What is this scoot animal you refer to? If it is yours, no animals in the clinic, and if it poops you must clean up it's cyber doodie. We don't need bones here, we're adults.......snif....and you hurt Doc's feelings. That seat was obviously ill, it had a sickly color. You healed it very nicely, well done. Scooter Doc
Post by Scooter Doc on Apr 23, 2010 4:30:06 GMT -6
Cruiser's very cool scooter.
Jonway YY250T: Added side bags, HID headlights, LED taillights and running lights, electric fuel pump, 19 gram Dr Pulley sliders, BadBoy airhorns, chrome tire fill stems, Dynabeads, carburetor support bracket, magnetic oil drain plug, usual PDI replacements, and a 4164 Autolite plug.
Post by Scooter Doc on Apr 10, 2010 10:05:58 GMT -6
I don't know much about Metros, are they really slow? I think they just look cool so they can have a speed defect as far as I'm concerned. However, this is from Steve's gang at MonsterGY6 and they're all about performance. So if they're slow from the factory they've probably juiced them up.
Post by Scooter Doc on Apr 10, 2010 4:14:13 GMT -6
The broken stud can be harmful to the exhaust valve if the leak is large enough to let cooler air in after you turn off the scoot. Repeated exposure to rapid temperature change can damage the valve and seat. Also, might you have filled it with too much oil? That can damage the rings. I prescribe checking the compression to help diagnose your problem, it's possible it's the rings and not the head. In that case you'd waste a lot of money on a non-fix. You can get a compression tester at auto parts stores, dirt bike shops, scooter shops, and here: search.harborfreight.com/cpisearch/web/search.do?keyword=compression+tester So do the test and let us know what you get. Any other Docs have a suggestion?
Hook up a compression gauge and open up the throttle all the way. Crank the scooter until the needle on the compression gague stops moving. This should take no more than 5 seconds. Very roughly, 100-125 psi is good, 125-150 psi is very good, and 150+ psi is great. If you don't have this level of compression then you have bad valves and/or bad piston rings. If you want, you can add a teaspoon or so of oil to the engine through the spark plug hole. Then try the compression test again. If compression is higher, then it's likely you have bad rings. The oil will seal the rings and give you better compression. If compression is the same, then you have bad/misadjusted valves.