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by: bobby17772 - Apr 9, 2013 22:00:20 GMT -5
Post by bobby17772 on Apr 9, 2013 22:00:20 GMT -5
hey guys, I just installed my big bore kit today but when I went to put the head on it was like the rocker arms were to long. I looked in my box of goodies and saw that it came with new rocker arms but I can't find how to install them, like how to take apart the assembly. if anyone can tell me that would be awesome.
thanks
Bob
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by: triker - Apr 9, 2013 22:09:41 GMT -5
Post by triker on Apr 9, 2013 22:09:41 GMT -5
Look at the sides of the assembly the rocker arm shafts have a slot in them, they do not screw out though they should slide out. if they don't just rap it on something and they should slide out. The slot is so you can align the notches to line up with the holes so that head studs will go through.
Roy
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by: skuttadawg - Apr 9, 2013 22:10:24 GMT -5
Post by skuttadawg on Apr 9, 2013 22:10:24 GMT -5
A 139QMB the 50cc ? Some have 64mm valves others have 69mm
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by: bobby17772 - Apr 9, 2013 22:14:27 GMT -5
Post by bobby17772 on Apr 9, 2013 22:14:27 GMT -5
yeah I believe that the stock ones are 69 and the new ones are 64. so if I just hit it a few times the pins should just slide right out?
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by: triker - Apr 9, 2013 22:31:51 GMT -5
Post by triker on Apr 9, 2013 22:31:51 GMT -5
An easy way to tell the valve length. Lay a straight edge across the top of the valve springs and measure the distance between the top of the head and the bottom of straight edge. The head on the left has 69mm valves, the distance measures about 10mm. The head on the right has 64mm valves and the distance is about 5mm.  Roy |
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by: alleyoop - Apr 9, 2013 22:45:51 GMT -5
Post by alleyoop on Apr 9, 2013 22:45:51 GMT -5
Well the head on the right is taller than the one on the left so of course the left one from the top of the spring to top of the head will be greater.
Best way to measure is from valve stem to valve stem. The 69 will be a wider gap than the 64.
Alleyoop
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by: ej132 - Apr 9, 2013 22:46:05 GMT -5
Post by ej132 on Apr 9, 2013 22:46:05 GMT -5
How long did the install take for you? Looking to do a bbk soon and just wondering how long to plan for it
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by: triker - Apr 9, 2013 22:56:54 GMT -5
Post by triker on Apr 9, 2013 22:56:54 GMT -5
No, Alley the two heads are the same height. It is the camera angle that makes them look different. Both heads measure 59.5mm. the distance from stem to stem of the 69mm valves is 77.56mm. The measurement of the 64mm valves is 73.45m as measured inside, as measured outside the 69mm valves measured 82.56mm and the 64mm valve head measured 78.45mm    Roy |
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by: bobby17772 - Apr 10, 2013 13:24:44 GMT -5
Post by bobby17772 on Apr 10, 2013 13:24:44 GMT -5
Odd question but what happens if I use my old head I can't seem to get the pins out and I just want my scooter running
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by: alleyoop - Apr 10, 2013 13:29:43 GMT -5
Post by alleyoop on Apr 10, 2013 13:29:43 GMT -5
Sorry but that first picture it sure makes the right head look taller(HAHA).
Alleyoop
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by: millsc - Apr 10, 2013 13:38:58 GMT -5
Post by millsc on Apr 10, 2013 13:38:58 GMT -5
tap one side of the rocker arm assembly on the dowel holes the other will pop up it works every time i need to make a vid
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by: bobby17772 - Apr 10, 2013 13:49:14 GMT -5
Post by bobby17772 on Apr 10, 2013 13:49:14 GMT -5
Well I can't get the little screw ends out
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by: triker - Apr 10, 2013 13:57:33 GMT -5
Post by triker on Apr 10, 2013 13:57:33 GMT -5
If you over torqued the head stud nuts, it may have squeezed the assembly and the may be tight. Can you turn the studs with a screwdriver? Hold it on a solid surface with the stud hole hanging over the edge and rap it with a rubber/plastic mallet. not to hard though you may distort or break the assembly. You might also have to wiggle the rocker arm.
Roy
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by: triker - Apr 10, 2013 14:03:26 GMT -5
Post by triker on Apr 10, 2013 14:03:26 GMT -5
Sorry but that first picture it sure makes the right head look taller(HAHA). Alleyoop No problem Alley.  I usually work in my shop where there is more lighting. But I didn't want to drag this stuff from the garage to the shop out back. It was raining pretty hard yesterday.  Roy |
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by: bobby17772 - Apr 10, 2013 14:17:41 GMT -5
Post by bobby17772 on Apr 10, 2013 14:17:41 GMT -5
Yeah I can turn them with a screw driver so should the whole assembly come a part or just the pins come out
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..BAD TO THE BONE..
