Keep making video bud! Much appreciated. So much information in so little time. You not only are an expert, but can convey that information precisely and quickly. I'm doing my first top end this week on a 2001 yamaha 800xl this weekend. I hope I figure out why it feels like it is running out of fuel after full throttle and warmed up. I went through the tank, carbs. But, pulling the motor was the last resort. I hope it is just gunked up sticking power valves. They look great on the outside, rotate perfectly, and I cleaned them about 5 years ago when I put waveeater clips on them. But, the inside might be different. Beyond that, do you have any ideas? It has clean carbs, runs crisp (stock, and at 5500 feet elevation is where we live, near a lake) any other ideas. Still has the stock yamaha fuel lines. But, I took everything apart fuel line wise and fuel tank and pickup, and didn't see anything clogged. It started at the end of last season, after overfilling the fuel tank, and hitting a big wake, I think?
Thank you! I've seen multiple videos on spark plug reading. I have never seen anybody do an in-depth tutorial on reading Pistons. Thank you for sharing your wealth of knowledge🤘
Awesome…..!!!! Very informative on piston failure. I had a new piston on my 88 cr500 that had a head gasket failure that washed away the premix that you describe to the T…!!! Keep up the great work.
Pre ignition is an uncontrolled air/fuel mixture firing before tdc and detonation is after. Pre ignition breaks pistons, bends rods, ruins rod bearings.
It is often said that a design error in the engine itself can result in severe knocking or side slap of the piston, leading to damage. Sometimes changing the plugs solves the problem, which is a very difficult part.
Knock and piston rock are 2 very different things. Piston slap is from either to much clearance, or being worn out, or not being warmed up correctly will not get better by changing plugs. Pre ign , knock can sometimes be helped changing plugs, but even then Normally needs higher octane fuel, or timing , fueling, or boost adjustments to safely solve the issue
@@EricksonMachinePerformance The solution I took earlier was to change the plugs. The standard is NGK CMR7H, but when I replaced it with CMR6A, which has a shorter reach, things surprisingly improved. I don't know if the manufacturer didn't test it enough or if it was a design error.
@@EricksonMachinePerformance I was talking about a 45cc engine for radio controlled models. The problem I described was so bad that it took a long time to resolve.
@EricksonMachinePerformance good to know! I work in a sign fabrication it's nothing but shit talking all day! You are welcome mark keep up the good content my friend
So i melted piston rings and piston in my outboard i think i have bad fuel pump can cause that? On low throttle it go good and then full throttle and i hear ticking noise and engine stoped fast 💀
My skirt shattered on the intake side. (2nd time) I am boring it 1mm over to solve the loose piston problem. I need to clean all the aluminum out of the bottom end. Will I need to replace the bearings even if there is no movement in the rod. It's a 2 stroke. And I seen black oil on thee counter weight when I turned it over which seems odd
Had an 85 rm250 that the cylinder would not hold round long enough to wear out the piston.😂 The cylinder liners were junk in those early 80's Suzuki's. I had it bored every month. It never took less than .030 over to get it round again. Went trough two cylinders and sold it.
I'll be honest the only chain saws I have messed with the engines on are hotsaws . The bigger issue is normally new fuels don't sit well. So if you're leaving the saw, sit longer than a week or 2, you should use fuel stabilizer. As to newer saws needing higher octane, I'm not sure
Funny you say that, I just had one. 20 hours on the engine. Looks like a ring broke. Under warranty but I’m thinking I’ll just fix it myself, really don’t want to deal with them. The heads were installed backwards from the start. Tigershark 1000
Seems like you’re just using two-stroke pistons for all of this considering they only have two rings and the length of the piston skirt. I would imagine it would happen more on a two-stroke engine, considering they run a high rpm, and they run very hot.
This video is only about 2 stroke piston failures like it says in the title. 2 stroke and 4 stroke pistons fail in different ways. This video is meant to help someone diagnose their failure
