Hey Everyone,
Happy Fall! I was bombing down a hill at WOT on a two week old 66cc/80cc bike engine when the engine suddenly died brining me to a complete stop. White smoke was coming out of the air intake. When I pulled in the the clutch to roll the bike back to my house, the sound of the piston moving inside the cylinder was VERY loud.
At first I assumed this was an overheating issue. Since the piston isn't directly exposed to the air, maybe it was hotter than the cylinder and expanded inside, making it difficult to move inside the cylinder. I theorized this would account for the loud metal-on-metal sound inside the cylinder, and could also account for the back flow of smoke out the air intake which likely created a fuel starvation condition.
After the bike had cooled for awhile, the metal on metal sound was gone and the bike started right back up. However, power was significantly decreased. Since it seems like a compression issue I tested for external air leaks with krylon spray and found none. Now I am worried I busted one of my piston rings. Does this seem likely? Is there something I should check first before disassembling my engine?
If it is a busted piston ring, can I just change the ring? Or do I have to replace the whole piston / cylinder set up
This is the engine kit I have been using except with an aftermarket shorty intake:
Happy Fall! I was bombing down a hill at WOT on a two week old 66cc/80cc bike engine when the engine suddenly died brining me to a complete stop. White smoke was coming out of the air intake. When I pulled in the the clutch to roll the bike back to my house, the sound of the piston moving inside the cylinder was VERY loud.
At first I assumed this was an overheating issue. Since the piston isn't directly exposed to the air, maybe it was hotter than the cylinder and expanded inside, making it difficult to move inside the cylinder. I theorized this would account for the loud metal-on-metal sound inside the cylinder, and could also account for the back flow of smoke out the air intake which likely created a fuel starvation condition.
After the bike had cooled for awhile, the metal on metal sound was gone and the bike started right back up. However, power was significantly decreased. Since it seems like a compression issue I tested for external air leaks with krylon spray and found none. Now I am worried I busted one of my piston rings. Does this seem likely? Is there something I should check first before disassembling my engine?
If it is a busted piston ring, can I just change the ring? Or do I have to replace the whole piston / cylinder set up
This is the engine kit I have been using except with an aftermarket shorty intake:
BBR Tuning Racing Series Stage 1 66/80cc 2-Stroke Engine Kit
The BBR Tuning 66/80cc Stage 1 Racing 2-Stroke Engine Kit gives you a high compression, high performing, and highly reliable engine for your next build.
www.bikeberry.com