i told you i just got off the phone with Scott @ AJP oh lord what have i done every body wish me luck and pray for me turns out a buddy of mine almost pulled the trigger a month or so ago but backed out
Tidbits. All PR5's (not sure about other models" come with a performance tip for the muffler. I just got mine and will test it. Much larger hole and more flow through design. Simple snap ring install. The muffler itself is very well designed, light and fits nice so no real need to replace. Looks easy to repack. Gear ratios seem well picked. It is a tight ratio 6 speed, no big gaps between gears and very well spaced for the power of the motor. Will cruz about 45 no problem. 1st is low enough for anything. 2nd works good in the gnar and it has good bottom so will pull it. It does struggle to pull 3rd on a big up hill. Clutch feels semi stiff when just playing with it but I never noticed it when riding. You also don't need to use it a ton as the motor is very flexible. The trans is slightly notchy but found it improved a good amount with Mobile One full synthetic. Holds almost 2 quarts so a lot in modern terms. Oil changes are very easy, skid plate has hole so no need to remove. Valves are threaded adjusters so just tools and time to do a valve adjustment. EFI works well, not perfect but very good. Never stalls. When warm starts near instantly and the starter motor does not seem to have any trouble turning it. I might have mentioned this before but the motor never complains. Never seems to get hot, fan almost never comes on, never is hard to start after a good flogging, just lights up and runs the same every time. Going to put my earth-x battery in it and see if I can feel a difference. Should remove 3-4 pounds of semi high placed weight. The fun continues.
Oh a couple other items when looking over the parts diagrams. The motor has roller rockers and a counterbalancer. I do have to say this is one smooth engine, almost zero vibrations. Jumping off this onto a 2 stroke is an eye opener on how much modern 2 strokes vibrate.
Tinken's and Ty's house of horsepower needs to get their hands on a PR5 and see how much more is hiding in these beauties.
Tinken mentioned that he wants to get his hands on one during my parts run and visit at Zip Ty HQ today. I bet they can release a few ponies waiting inside. Glad to hear of the threaded valve adjusts! Sucks to have to tear down the whole top end to mess with shims.
WE need a 300 Big Bore kit for the PR4...........Walt . Well we may need one. I guess we'll see after K take one for a spin.
there is one thing we are all not thinking about what if all this HP we want[ but mite not really need] upsets that wonderful chassis and what about poor Walt i already got him workin on a long rod 165/177 with a turbo crank we dont pay good enuff he has a day job
well the PR3/4s are carburetored it looks like the bottom of the tank is below the the carburetor i assume theirs a pump involved in the deal
Probably a vacuum operated diaphragm fuel pump. Lots of older Japanese bikes had these. Shouldn't complicate a carb swap.
