chickenman242
Hardcore RCTalk User
probably a bit late here but I will chime in , the 3.3 isn't a bad engine just gets a bit of a bum rap because its the engine a lot of newbies learn on and usually toast. the bearing problem is fairly consistant however but I have found the cheapest and easiest way to get around it is go to a ebay chop shop such as dollarhobbies and get a block with with bearings installed ,usually round $25us shipped.
if you have sealed I correctly and still find it wanting to lean out check the carb , look at the body for cracks and pull the needles out and inspect the orings . being a mass produced engine qc can sometime suffer.
also what fuel are you using and what type of plug , I have found that fuel with a bit more oil is better for trx mills (11-15% oil) and an os plug is best ,use a lc3 for lower nitro (10-20%) and lc4 for higher % (25-30%) . hope this all helps
also in regard to the os tm engine range , I would look as something different .the 21tm is way overpriced for what it does really and is no easier to tune than a 3.3 imho not worth it . I would look at either a novarossi 2.5 supercharged engine ,at $175 from amain it a great engine and it comes with a pipe and manifold but it is a roto start. also there is the ofna/picco engines too I have the 28jl max is a 2.5 revo and it hauls and you can get it in the truck fro under $200 and stomps all over the 21tm.
if you have sealed I correctly and still find it wanting to lean out check the carb , look at the body for cracks and pull the needles out and inspect the orings . being a mass produced engine qc can sometime suffer.
also what fuel are you using and what type of plug , I have found that fuel with a bit more oil is better for trx mills (11-15% oil) and an os plug is best ,use a lc3 for lower nitro (10-20%) and lc4 for higher % (25-30%) . hope this all helps
also in regard to the os tm engine range , I would look as something different .the 21tm is way overpriced for what it does really and is no easier to tune than a 3.3 imho not worth it . I would look at either a novarossi 2.5 supercharged engine ,at $175 from amain it a great engine and it comes with a pipe and manifold but it is a roto start. also there is the ofna/picco engines too I have the 28jl max is a 2.5 revo and it hauls and you can get it in the truck fro under $200 and stomps all over the 21tm.
