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11
Newcomers / Re: racing cams lawnmower
« Last post by Jim Knutson on Today at 08:56:13 AM »
Sounds like a bad spark plug....happens more than you would think.
12
Oppy mechanics manual says:



However, do you think, re-facing the valves and seats both to 30 is advantageous? Because of:




Moreover, the exhaust valve head's upper most part is rather thick compared to the intake valve head. I guess, this is due to better heat transfer enhanced by more material. On the other hand, I definetly believe this thick valve head reduces gas flow. See lower valve on this Picture; it really sticks out:


What do you think, should I "flatten" the head by grinding off some material?

The Oppy mechanics manual states minimum thickness of valve head(s) to 1/32" - this would be at least half of what it measures right now.
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Mower Engines & Parts / Re: Oppy and briggs31ci single parts
« Last post by GermanFred on Today at 04:54:26 AM »
Hi, 

"Oppy cam it's a precision 212 alt. $200"

-> Still for sale? Would you ship to Germany?

Do standard rods of a 40 ci (with 42 heads) fit with it without machining anything?
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the newer style 42 head is cut out a little more on the exhaust side about like you have it marked

You mean like this?



I was already wondering why every picture of 42 oppy cylinder heads I found on the web did not look like mine (far right one). There is the answer, I guess.



Do you think it is worthwhile grinding off the bit within the red circle? (not caring about losing compression by this)

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Want To Buy / Who Has It? / Cheeta cam Intek vtwin
« Last post by PJG56 on Yesterday at 09:13:53 PM »
Looking for a good used Precision Cheetah cam or something similar  for vtwin Intek
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Newcomers / Re: racing cams lawnmower
« Last post by PJG56 on Yesterday at 06:46:48 PM »
Did you swap plugs to see if it would run on other cyl.?
do you have compression in that cyl.?
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Mower Engines & Parts / Re: Ch 18 for sale
« Last post by chevydmax6 on Yesterday at 04:54:23 PM »
Willing to trade for vanguard parts
Obo
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Newcomers / Re: racing cams lawnmower
« Last post by ldc2405 on Yesterday at 11:54:12 AM »
I installed new coil and I got same results. will not run on # 2 cylinder. any answers?
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Newcomers / Troy bilt pony 17.5/42
« Last post by Salvaged on Yesterday at 10:22:15 AM »
Hi everyone. New to the group. I have a Troy Bilt Pony 17.5 B&S mower that i salvaged and was looking to transform it into a racer. The issue is out of all the you tube, google ect. searches i have done I have yet to see a troy bilt pony racer. Are they just not any good to use?
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Mower Engines & Parts / Ch 18 for sale
« Last post by chevydmax6 on December 03, 2016, 12:44:55 PM »
Hello I have a kohler command 18 for sale
Motor has 1 1/8 crank
Governor has been removed
Heavier springs have been installed good to 5000rpm
Stronger push rods
25hp carb with accel pump
New rings both heads had a valve job
Motor has about 100hrs on it after rebuild
$600 plus shipping

Located in northern Ohio
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