No bottom end

Its been my experience that when you have no bottom end but good top end power, usually means low compression, you might need to do a top end rebuild. (rings) The oil spitting out could also be an indicator of worn rings. The slow jet (inside carb) and air jet(screw on outside) control the rich/lean condition at an idle, by turning the screw on the outside of the carb counter clock-wise you will let in more air, ONLY TURN THE SCREW 1/4 TURNS AT A TIME. The more air, the leaner you get, a lean running 2-stroke is the worst thing you can do to a bike, so I say again only a 1/4 turn at a time to see if this helps. The bottom line is you probably need a rebulid, and decarbon the exhaust valve. The oil spitting out the front of the motor is not a big thing just make sure the exhaust isn't plugged and have it resealed. Top end rebuilds aren't to spendy or to difficult, so it shouldn't put a big dent in your pocket! hope this helps- bjawes

Bjawles a CR80, has no Power valve to clean please i know you are trying to help but you are not. if the bike has low compression it will not have any power at any throttle opening it will be hard to start. And turning the air screw a quarter turn at a time is also a no no. you could go right past the adjustment you want and never know it. the air screw is for off idle throttle response and that is about all. the CR 80 Exhaust manifolds are notorious for leaking especially when jetted rich and just putted around Atomic 22 sells an after market manifold that uses 2 o-rings that seals way better

No, the air screw is for fully closed to 1/4 throttle, and maybe I am wrong about telling some one who isn't a mechanic to adjust an air screw. So sorry for that, but you should check to see if it is at the factory setting (all the way in and then 1 1/4 to 1 3/4 turns out in most cases). And yes low compression will give you no bottom end but becomes more alive at higher rpm's. bottom line I do not know what is wrong with the bike it may have a clogged slow jet or needle problem, or it may need like I said before a top end rebuild.Travis you are not a mechanic, although you may have been around bikes a long time, and have seen alot of things, and can even help people with common problems, does not put you in any positioin to judge me. Sorry for any confusion- bjawes

Bjawles actually i am a Mechanic and i am sorry if you thought i was judging you.

TravisP said:

Bjawles actually i am a Mechanic and i am sorry if you thought i was judging you.

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No harm done, sorry if I came off a little harsh towards you, thanks for writing back. bjawes

Actually, Travis had mentioned this before, you might even have worn out reeds?