Hello All,
As you may know I am kinda new to the 2 Strokes and just got my R a few weeks back, been working on getting her tuned in, had a lot of work to do as it sat for a year and a half. I got it running like a raped ape now but just wondering is the engine rattle normal in these?? I have read yes and no, it does not ping or knock, doesn't sound like metal knocking, just a slight rattle when idling. I got great compression. The guy I got it from said that the engine was pretty fresh with wiseco piston and 265 kit. I would upload a video but, hell I cant even figure out how to upload pics, new to this. Any answers will help just got and don't want her blowing up on me.
Thank you
Jeff
The rattle at an idle is usually piston slap and or clutch rattle. Squeeze in the clutch lever and listen to the change in the rattle. The rattle left over is usually piston slap.
Forged pistons need more clearance and get loose much quicker than cast pistons.
Forged pistons are much softer and ware much more rapidly than cast piston.
Forged pistons do not usually shatter unless you ignore the obvious sounds of an extremely loose piston.
Cast pistons are much more apt to shatter than forged pistons when they get loose or are severely over-reved.
Piston ring life is about the same on the use of forged or cast pistons.
On a good running 250 or big bore we usually will see an increase in power after installing a new set of rings about every 4 to 6 hours when the engines are being run very hard on the race track or in heavy sand. The piston should be replaced every other set of rings to keep it tight and prevent cracking due to normal fatigue. Keeping the clearances tight helps minimizes ware to the bore and helps keep the power up because tight clearances helps the crank case pump more air through the engine.
Always measure the piston to cylinder wall clearance before installing a new set of rings or piston. If you keep the dust from getting past the air filter and put a lot of oil in the fuel, it is not uncommon to put 3 to 5 pistons without needling to bore the cylinder.
