Well I have a jp fx b5 and just trin to break it in but not havin any sucess. i heat the engine up to about 140 with a hair dryer cause it wont really get any hotter and i loosen the plug just a half turn and i try to bump it and it wont turn. i had it run for like 30 sec but otherwise i have torn up my bump box and dont know what i am doin wrong. I will also note i suck with the bump box, i am sure it takes getting used to cause it aint no pullstart. any suggestions would be helpful thanks.

put a hyper 4 port piston and rod in it.. if its the same boar as the P5 ( which im bettin git is) the 4 port piston will allow you to run it in to the point where the original piston will fit.

this engine cost me an arm and a leg i wouldnt want to change it if i dont have to. is the p5 the same as the b5 cause?

well you asked what will help... Failing that you will have to persist.. it may take time but once its started you should be fine, just make sure the first 3 mins of running you get the temps up to 190 f , that way the sleeve will set .. good luck

WHAT??????????? Are you stoooooooooopid. Don't do that.

Not only will it NOT fit, but the break in will be a waste of time, the liner will be ruined, the piston will hit the button, the porting will be wrong and it WILL cost you an engine.

OK now here's what to do,

read the manual and set the needles up as descibed in it. Normally Idle 1mm gap, LSN 3 - 3.5 turns out from closed and HSN 3 turns out from closed. Now squirt a few drops of After run oil down the carb throat and in the plug hole, disconnect the fuel line and turn the engine over a bit to lube it up. Now reconnect the fuel line and fill the tank, remove the plug, and block the exhaust. turn the engine over till fuel spits out the plug hole, refit the plug and fire her up.

ok i understand i did ask lol thanks for the tip.

The first line was aimed at Massivemods and not you.

If you are really struggling to turn it over when new, then do as alex says, but rather than spin it up on the starter box, chuck the pilot shaft up in an electric drill and spin it over for a few minutes, regularly adding more after run oil or neat castor lube...

This is only for engines with an extreme pinch from new that are eating starter wheels for breakfast

What is the deal with people not being able to heat up their engines above 200F? Are you simply impatient?
I have a cheap hair dryer that can heat up the engine to boiling... it simply takes time. The engine retains heat. Just stick the dryer on top of the cylinder head and wait 5mins maybe more. If still won't work, rubber band on some tin foil.
Then you won't have this problem.

Yes and make sure you have the drill in reverse mode (anticlockwise) so it doesn't damage the bearings and gets use to rotating in the correct direction.

Hi i had the same problem with my new hyper pro uk engine, it is worth persisting, and always make sure after a failed turn on the starter box to put the flywheel back to bdc(bottom dead cetre) or you will do as described in earlier posts and it will eat the starter wheel, i had to undo the plug a little then as it stated to turn over when it begins to fire do up the plug with the glow stater to give it more compression, and then take out the glow stater and finish by tightening the plg properly with the plug spanner, they are tight but persist it is worth it when it fires up, it will get easier to start with the box after a few heat cycles.

hope this helps

Rod