Does anyone know what this is?
Just from people in the past posting something similar, either here or Facebook, or possibly TRX250R.org. If you do some searches here, I think they’re called intake boost ports. I’m no porting expert.where did you see it? Im trying to figure out who did the port work on this cylinder, its quite extensive, the exhaust port is huge.
I received it with a bunch of loose R parts
I suppose thats possible but all 86 cylinder sleeves have an 85 stamped in them. I have an 85 atc cylinder, 86 atc cylinder & 2 86trx cylinders on the shelf that all have the 85 stamp. The only one thats different is the 86atc cylinder has p85p stamped into it. Likewise I have a cylinder that came from an 89 but it has 88 stamped on the sleeve.I don't think that's entirely true, I believe there are some 85 cylinders that have the bridge, possibly late production