matt_urban Posted February 15, 2010 Report Share Posted February 15, 2010 #1 Is it worth poping head off and cleaning/polishing head and top of piston from time to time ? #2 can i reuse head gasket once ? #3 would this maybe sort out pinking and knocking on down revs ? Thanks Matt Quote Link to comment Share on other sites More sharing options...
dannybutler Posted February 15, 2010 Report Share Posted February 15, 2010 Wont harm it in any way but dont know about the reuse on the head gasket !!, as for the pinking take a look at the air screw needs olny to be around 1 1/4 - 1 1/2 turns out this will help at the bottom mate ok. Danny Quote Link to comment Share on other sites More sharing options...
chewy Posted February 15, 2010 Report Share Posted February 15, 2010 NO NO NO NO Quote Link to comment Share on other sites More sharing options...
max1956bikes Posted February 15, 2010 Report Share Posted February 15, 2010 no. try useing super unleaded Quote Link to comment Share on other sites More sharing options...
feetdown Posted February 15, 2010 Report Share Posted February 15, 2010 NO NO NO NO Come on Chewy, Valid question, and deserves a proper explanation, Why NO? it is very common in other motorsports involving 2Stroke engines (especially Karts) to inspect the piston head and polish as frequently as we clean our carbs & filters, In Fact a lot of the old skool can tell you more about fuelling based on the deposits on the piston head than 'reading' the spark plug! Personally once a year as part of my end of season ritual I completely rebuild my lump and this includes removing the carbon deposits on my piston. Maybe thats why im still riding my 2000 Rev competitively in the A group (May buy an Evo soon though ) I agree that you should never recycle gaskets Quote Link to comment Share on other sites More sharing options...
matt_urban Posted February 16, 2010 Author Report Share Posted February 16, 2010 ok will try fresh fuel and carb clean first thanks for the helpfull comments I was told by a bsa expert carbon on the piston is good because it protects piston from heat a bit more than a clean piston Quote Link to comment Share on other sites More sharing options...
dang2407 Posted February 16, 2010 Report Share Posted February 16, 2010 Build-up of carbon on the piston (or head) is bad in 2 ways: 1) It increases compression (it could be a good thing if you wanted that...) 2) The carbon is likely to get hotter than the piston itself and glow red-hot. This can ignite the mixture before the spark-plug fires, causing pre-ignition or detonation. So, it would be a good idea to clean up the piston and head if you are chasing a pinking/detonation problem, but like the other post said, make sure your carb settings are right for your altitude and your fuel is fresh first ... because it's cheaper and easier before getting into engine dismantling... Quote Link to comment Share on other sites More sharing options...
matt_urban Posted February 16, 2010 Author Report Share Posted February 16, 2010 how old is old mixed fuel ? is a week ok to leave mixed super ? Quote Link to comment Share on other sites More sharing options...
liviob Posted February 16, 2010 Report Share Posted February 16, 2010 how old is old mixed fuel ? is a week ok to leave mixed super ? I have fuel sitting in a can up to two months with no problems, but the opti2 oil that i use for motor lube has a fuel stabilizer in it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.