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Motorcycle Repair/KX 85 won't start, cycle shop can't figuire it out!

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Question
This is crazy! Bought a used 2008 KX 85 3 weeks ago and my son rode it for five minutes before it seized! I then bought another KX 85 on Monday and my son first drove it yesterday, (rain), and it stopped working after 15 minutes. It will turn over, but won't start. I cleaned the carb, checked the compression, it's low, but 120. Spark is good, new plug; gas is getting to carb and cylinder. Won't fire!

I took it to a cycle shop today, they couldn't figure it out! They re-cleaned carb, checked plug, checked CDI box, reed valves and wiring. They charged me and sent me home with a bike that won't start.

Now I have two KX 85 bikes for my son, but he can't ride with his pack of friends because he sold his Honda. Any suggestions, I am going to work on it over the weekend and take to a different shop on Monday if i don't succeed.

Answer
Roger,  This is going to sound crazy but here goes. A few years ago Kawasaki and Suzuki merged and some of the bikes had the other companies motors,this was more for marketing purposes. Some of the Suzuki motors would lose power and some would seize up do to a lean condition. The seal and crank brg behind the flywheel would go bad and allow air into the crank case and lean out the fuel mix and the engines would go down quickly under severe race conditions.

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Gary Blake

Expertise

I have built from ground up race winning motocross bikes and atvs as well as atv,s for flat track and TT racing. I am starting to take on the utv challenges now for racing. This is a new area for me so Im in a learning curve.

Experience

I have extensive experience in off road motorcycles and atv,s.I also work on street bikes and personal watercraft, Some experience was self taught and some was factory trained. I have been working in the powersports industry since the mid 70,s I hope I can help. Thanks Gary

Organizations
Was a sponsor for K.O.R.R.(kansas off road riders) and now I am working with ROMEO,s (retired old motorcyclists eating out)and was in charge of the Quad Wars for the monster truck series in Central Kansas

Education/Credentials
Factory trained Kawasaki Heavy Industries. Factory trained GasGas motorcycles and atvs worked as a technician and was as a dealership owner.Kaw.Suz,Honda,Aprilia,Arctic cat,See Doo,Can Am, Bombardier,Yamaha,GasGas,Qingi,TM,Moto Guzzi,Harley,s

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