Bike is bogging bad!Need help!

I Have a 70cc 2 stroke motor that I bought from thatsdax,actually its my 3rd motor I have bought over the years....A couple days ago I was on my way home and it started bogging out really bad and I had to put the choke halfway on the drive....When I got home I took the carb off and the needleseat had unscrewed and was in the bottom of the bowl so I screwed it back in and put it back togeather and had the same problem....I checked the plug and it was not running lean....So I took one of my extra carbs laying around and put it on and had the same problem with it bogging out....I then checked the plug again and it was white and running way to lean....So I built a new intake gasket from a gasket kit I had laying around and put a O ring in the carb to go into the intake....Fired it up and still the same problem....When I take off I have to keep the choke over halfway on....The motor has exellent compresson....I also took the tank off and checked the filter and then checked the gas filter going to the carb to see if they were clogged but they are fine as well....Could it be a weak magneto?What is going on?Please help!

Thanks
John-John

It does sound like you have an air leak somewhere. I had the same problem once on the way to church. When I put the choke on so it would act right, the intake kinda moved. I found that the bolts that secured it to the motor had come loose. Once they were tight again it ran like a champ. I'm not saying that you're having the same problem but from your description it does sound ilke you have an air leak somewhere.

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"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." - Thomas Jefferson

Thats what I thought but I dont think so....Im in texas and its been in the 90's so I have been running it rich on the oil mixture....Im going to take the exaust pipe off and see if it is plugged....If anyone else has some idea's please let me know what else it could be....

Ok,I took the exaust pipe off and its not clogged so im getting good flow....I put a 3rd carb on it with a bigger needle and seat and its still doing the same thing....Its bogging when I give it gas and I have to keep the choke on....Im thinking its the magneto or the sparkplug....I would just put another magneto on it but I dont have an extra one and it will take 5 to 7 days to get here and that is the only transportation I have....Man im screwed....Does anyone else have any idea's of what can be causing this????Please help....
Thanks
John-John

If it runs better with the choke on, it really sounds like an air leak. That air has to come from somewhere or the motor will cut out.

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Sun Tzu: To secure ourselves against defeat lies in our own hands, but the opportunity of defeating the enemy is provided by the enemy himself.

I couldnt agree with you more,but there is only 2 places the air could get in,eather the intake going into the head or were the carb slides onto the the intake and its not leaking from what I can tell and the sparkplug is not white now so its not running to lean persay....Its the crazyest thing....I will take the intake back off tomorrow and see if the new gasket going into the head is ok....

John-John

Check the cylinder base, and look for oil coming from either of the seals on the crank.

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Put something FUN between your legs..

Thanks....I found out it was the magneto after all....I ordered one and it will be in monday or tuesday...

Wow glad you found the problem. First I ever heard of a mag that only kinda ran. Usually they're an all or nothing kinda deal.

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Put something FUN between your legs..

This is the second time I have had a problem were the magneto worked barly....the other 2 just went out completely....The lasttime this happened it spit and sputtered and would cut in and out going down the road,but went out completely the next day and I had to buy another one....My dad said that if any kind of metel debree gets in on the windings that it can short and reduce the output of the magneto without completely going out....Have you had magneto problems?This is the 4th magneto I have gone through over the last 3 years on different 2 stroke motors(I have 3 of them)so I know its not just something wrong with this motor causing a short and making them go out....I found a site one time that sold a high end magneto that said that they are wraped better and eliminates this on going problem,but I cant find the site again(I should have put it on my favorites)....