tooty
2nd Class Ticket
Posts: 13
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Post by tooty on Apr 20, 2006 14:52:35 GMT
I have asked this question a few times on different forums but never quite seem to get the full answer. I have in my garage a pk 50  but I also have a spare px engine or two the frame has been modified in the past to accept a px motor, but I need to know what is needed to be done to the engine to make it fit.  What I am after specifically is dimensions of how much needs to be shaved off each side of the swing arm and I believe that the rear shock mounting point needs to be altered on the frame. Can anyone help |
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Post by Smallframe on Apr 21, 2006 11:06:09 GMT
Step 1: Drill out the holes in the frame that the engine bolt goes through to the diameter of the large frame engine bolt.
Step 2: Cut off the engine side panel (50 specials), if you don't the engine won't fit.
Step 3: Inside the 50 special engine bay, next to where the carb manifold goes through, there is a piece of metal that has to be flattened out, do that or you won't have clearance for the cylinder head.
Step 4: Now in the engine bay you can more or less see the shape of the small frame motor cylinder. In that hole drill 3 hole side by side, first for the throttle cable, second for the electrics, thrid for the fuel pipe. you can't put the fuel pipe through the hole where the carb manifold used to be as it will not gravity feed if you do.
Step 5: The rear shocker has to be made more upright so that it doesn't hit off the clutch casing and so as to raise the angle of the engine so that there is clearance for the carb box lid. This is easily done by taking flat bar of tempered steel about 4mm thick and 25mm wide. it has to be about 75mm long. once you have it cut to length, drill two holes in it, the centre of each one being around 15mm from the edge of the bar at either end. bolt this to the top of you shocker and then bolt it into the frame. thats the shocker done.
Step 6: Carefully measure and mark the main engine mount for cutting, you have to cut between 8 and 9mm off either end of the main mount.
Step 7: Slot your engine in and connect it up.
thats it!! as simple as that. good luck!!
these are rough instructions for a 50 special as pk specs will be slightly different .
UR handling will be crap u know ! so tweak a smallframe motor- they are well more fun
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Post by inishmore on Apr 21, 2006 14:19:42 GMT
respect for the guide!  |
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tooty
2nd Class Ticket
Posts: 13
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Post by tooty on Apr 25, 2006 11:50:11 GMT
yeah cheers for that, on the subject of tweaking the original engine any pointers what kit, setup etc bearing in mind that I have just maxed out the old plastic in doing up my px or does anyone know of a cheap smallframe motor
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but I also have a spare px engine or two the frame has been modified in the past to accept a px motor, but I need to know what is needed to be done to the engine to make it fit. 
What I am after specifically is dimensions of how much needs to be shaved off each side of the swing arm and I believe that the rear shock mounting point needs to be altered on the frame.
