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Post by jjoshua20213 on Sept 13, 2013 9:48:39 GMT -5
So ive done 2 bbk's and a head swap and never payed attention to the different valve lengths. Never had any problems.
My question is why the different lengths?
Does it effect performance?
If I were to use 69mm in and engine that came stock with 64mm it would hit the piston and bend right?
What if it were the other way around?
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Post by devo344a on Sept 13, 2013 9:58:55 GMT -5
No real differance they use differant rockers on each and wont hit the piston
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Post by jjoshua20213 on Sept 13, 2013 10:20:39 GMT -5
Cool. All 3 jobs I did have the stock rockers too. lol bbk's dont come with them.
Why the different lengths?
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Post by endru on Sept 14, 2013 21:36:54 GMT -5
[replyingto=jjoshua20213]jjoshua20213[/replyingto]My stock head had 69mm valves and my new head has the shorter valves. I've noticed that it's slightly more difficult to get a feeler gauge in underneath the tappet on the shorter valves, the top edge of the head gets in the way a little bit. Nothing major of course. Most newer scoots seem to have the 69mm valves, maybe they started to do that to make a valve adjustment easier.
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Post by devo344a on Sept 15, 2013 9:13:28 GMT -5
The reason for the shorter valves is probably cost less. Less material
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Post by sailracer on Sept 15, 2013 12:33:03 GMT -5
DX
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Post by f4milytime on Sept 15, 2013 13:24:33 GMT -5
I think they just do it, just to make things more confusing, if nothing else.  ALOHAz |
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