Yeah I was thinking the same thing. 1 1/2" makes a lot of sense. Plus I believe it says the studs are the next size bigger.
Thats a good kit biknut.....the muffler is the very restrictive one so that would be the first thing I chunked, but that's a good kit I know someone that got that same kit and it is working out great, very smooth running engine and after breaking in some has really come up in power.
Do you have any idea how the cylinder castings look? In the picture they look pretty good. I thought my Flying Horse had crappy castings till I saw a SkyHawk up close. It's even worse.
No I haven't seen one opened up or without exhaust and intake bolted up to it all I can tell you is a friend that has that exact engine is getting 34MPH out of it completely stock with a 44T sprocket on 72:1 Opti 2 and his is very smooth, I rode his bike once before it was even broke in good and he had the mix very oil rich and it was a very smooth engine, I was impressed at how good in ran even though it was really choked down with oil and was very low miles at the time, pulled hills good and at that time 4 stroked 100% of the time and would run 25-27MPH all day long that way, now that he has done some tuning on the carb. and went to the Opti 2 he is getting 34+ MPH and it still runs very good.
Thanks, that's a nice picture.Yes you have the PK-80 engine that I think is a better build engine as far as fit and finish than some of the others, the longer clutch arm is for better leverage an alignment with the cable as it come from under the carb.....
The silver paint is something I like about the X80A, it gives it a good uniform finish and makes it look as though it has had a bit more attention to detail than a raw Chinalum finish.
One thing you will find is that the Muffler on that engine is very quite and could be more restrictive than you like, but a friend of mine who also has that same engine is getting around 34MPH with 72:1 Opti 2 and a 44T sprocket and just a moderately tuned carb and NO other mods and his runs nice and smooth too, I've rode the bike and it is a very sweet riding bike with that engine on it.
I hope you have the same results as he has, if so you will be very happy with that engine, I have a brand new lower of that engine I plan to build up real nice for a shifter bike.
Best wishes with the new BGF engine, break it in right and have some fun.
Peace
I've heard the term PK 80. What's that stand for?Yes you have the PK-80 engine that I think is a better build engine as far as fit and finish than some of the others, the longer clutch arm is for better leverage an alignment with the cable as it come from under the carb.....
Not sure actually, I suppose it is a descriptive thing kinda like Skyhawk or Starfire or Raw or Jet GT5, GT4, ect........
I would suggest any baffle to replace that baffled-up baffle, but better yet, an expansion chamber.....any expansion chamber at that rate will do. That thing looks stiffled to say the least.This is probably why these exhaust systems are so quite. Not much noise is going to get out of there. I better give it some help.
This is probably why these exhaust systems are so quite. Not much noise is going to get out of there. I better give it some help.
This exhaust isn't as bad as it looks. Well actually I guess it is until I fix it lol. The only problem it has is these two tubes being pinched shut. I opened them up by driving a screwdriver through them.I would suggest any baffle to replace that baffled-up baffle, but better yet, an expansion chamber.....any expansion chamber at that rate will do. That thing looks stiffled to say the least.
Most of those muffs I've taken apart (or cut open) have three chambers with diff configurations. As you have done opening up those 2 tubes and then enlarging all of the holes inside the baffle will get it to breath better yet still have ample back pressure. That pipe will be fine.
