£1600 engine shopping list

if youve got 1600 to spend id say get a pm59 and get it strengthened by a local metal works

 

yeah, i think i'm going with the Jolly for my SR, i have looked at the other pipes they do for 2 strokes and none seem to give a bad reputation.

 

kundo ftw :bird:

 

erm..... nope

kundo are pretty good for a stock 125 or a mildly tuned one but in serious power realms the kundo is good for one thing, looks.

 

everyone knows the shinier ones go faster....

 

true, my microns on my RD produce 20% more power after a polish....




imp:

 

think i'm right in saying conversley shiny carbs go slower. really not fussed about looks. think it's more to do with principals with that pm, if i'm giving them £250 i expect it to be designed properly, not need me pissing about re-making it properly. suppose they get away with piss poor build quality by making it track only. not the same regulations i guess. jolly moto seem to have built up an almost legendary status amongst the two stroke fraternity, almost like an akrapovic for two strokes. just about to have a look see if the rs reed blocks are fittable on the runner

 

shiny carbs go slower due to the same principle as water on a windscreen on a car, the glass is so perfectly smooth that the water sticks to it, so when wipers are used it makes water smear accross but still sticks to the glass

 

assumed it was to do with the layer of still air over a smooth object as air moves over it. rough surfaces produce tiny vortices allowing the layer of air near the surface that would be still to effectively tumble along the surface. air would travel more smoothly into a polished carb, but more air would go into a carb with a cast inlet. i believe. going off of a level physics so wouldnt quote me on that arc:

 

probably a mixture of both, air being held up by it, and fuel being held up by it=shoddy performance, same reason a lot of people dont polish the inlet on a 4stroke

 

might try it, get 2 carbs and see if i can feel any difference at all. somehow doubt it, prob not even enough of a difference to warrant a jetting change. got hold of a 39 mm mag bodied carb off of an aprilia rsw125 for a 250 kart, that was just a very fine casting, no smoothing done to it at all

 

i'm guessing the faster flow of air gives better atomisation to begin with though yeh?

 

carb splitter cure that?

 

erm, never i guess. not seen the brass plate, what's that?

 

not bad. think i'll just stick to flat out everywhere. makes jetting easier =)