678cc, ~11:1 CR - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 46 Old 03-23-2016, 02:58 PM Thread Starter
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678cc, ~11:1 CR

Assembly starts soon. Some electrical work to finish.


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post #2 of 46 Old 03-23-2016, 03:26 PM
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What front pipe is that Tom...?

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post #3 of 46 Old 03-23-2016, 03:42 PM Thread Starter
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http://www.klrforum.com/146906-post6.html

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
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post #4 of 46 Old 03-23-2016, 03:53 PM
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I thought so, I seem to remember you making a bypass to stop it from boiling the carb. I ended up wrapping my pipe.

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post #5 of 46 Old 03-23-2016, 07:21 PM
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Tom,
Are those 'over-size' stainless valves that I see? .5 or 1.0?
Is there a little work on that head that is not visible?

pdwestman
Modify at "YOUR OWN RISK"!

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Last edited by pdwestman; 03-24-2016 at 11:47 AM. Reason: deleted an in-appropriate comment
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post #6 of 46 Old 03-23-2016, 07:26 PM Thread Starter
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Hi Paul,

Yes, they are 1mm oversize stainless.

The head has been ported and smoothed.

This was done some years ago when it was on my '08.

Tom

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
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post #7 of 46 Old 03-23-2016, 09:05 PM
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Most intriguing!

The displacement increase is about 4.3 %; however . . . the compression ratio is increased over 13%; don't know if it'll ever see a dynamometer, but I'd bet a robust power increase arises.

Pump premium gasoline and stock ignition timing ought to get along with no pinging, seems to me, because: 11.1:1 compression ratio is not unknown to some modern street engines.

Nothing wrong with the pumper CVK40; 50 million Harley riders (with pumper CV40s) can't be wrong!

Whose piston?

Following along with interest, Tom!
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post #8 of 46 Old 03-23-2016, 09:23 PM
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Tom did or are you planning on smoothing out all ridges etc inside the combustion chamber? Don't know how many ponies it'll make but it was one thing I was directed to do....after the work it seems you have already done....what does the pots under your valves look like? How aggressive is your porting job? Did you do it or who? Heavier valve springs? I chopped down the hieght of my valve guides also to help reduce as much from the air/fuel passageways..... I wonder if you have pics of the porting work...? All very nosey stuff....lol

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post #9 of 46 Old 03-24-2016, 12:46 AM
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Drooling and following............

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post #10 of 46 Old 03-24-2016, 09:33 AM
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I'm wondering if it is already too late for Tom to take pics of the oil return holes in the ring land and maybe any oiling holes in the piston pin boss?
Maybe measure the return hole size's?

We sure can be a demanding bunch, sorry Tom. We'll appreciate any and all info which is presented.
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