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The stock length of the chain on a monkey is 98 shackles. I run my 14/36 setup with the same number of shackles. You can check it on gearcommander.
 

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Discussion Starter #243 (Edited)
Want to share with you guys what DHM v1 Hc Piston and his big valve race ported head looks like after 8,000 miles.

Using a mix of max rpm thresholds ranging from 10,500 to 12,000.

Everything I learned about tuning was while using this set up w/DJ not aRacer.

As well as no oil cooler for about 98% of those miles.

No mechanical failures! 💪😎🔥

PXL_20201118_003601921.MP.jpg PXL_20201118_004104468.jpg Screenshot_20201118-075449~2.png Screenshot_20201118-075430~2.png Screenshot_20201118-075510~2.png Screenshot_20201118-075503~2.png PXL_20201118_003619610.jpg
 

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Hey dubSolo, if you would have used your DHM head (assuming it is a Intake 27mm/Exhaust 23mm), would you still have to cut valve reliefs in the Koso 170cc piston? How did you cut them? What is that device with the crank handle?

I’m starting to like the idea of a Koso 170cc 2-valve with a DHM 27/23 head.
 

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Discussion Starter #248
Cool stuff. I wish I was closer to you to watch and learn!
Is the circled spot in the Koso piston a casting defect?
Thanks! Love sharing knowledge learned, this was my first time attempting anything to this degree.

Not a casting defect, its where the Neo intake valve tapped the piston. Exhaust valve cleared fine did it for safe measure as well as GF is decking the head.

Hey dubSolo, if you would have used your DHM head (assuming it is a Intake 27mm/Exhaust 23mm), would you still have to cut valve reliefs in the piston? How did you cut them? What is that device with the crank handle?
Neo head is 30/24.5 using a high lift cam like Dcr2, was able to get full rotation turning by hand with no resistance. Intake valve barely kisses 170 piston, I'm almost certain the DHM head would clear just fine.

I cut them using my craftsmen hand drill, sand paper 3m taped to valves similar in size as the neo head and lots of patience lol, the device is a ring filer used to file rings evenly to proper gap spec.
 

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Thanks buddy. I know I’m always blasting you with questions.

I didn’t know there was such a device to file rings. I figured everyone did that by hand.

I think David at DHM mentions that his 27/23 head will clear the 2-valve 170 piston, now that I think about it.
 

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Discussion Starter #250
Thanks buddy. I know I’m always blasting you with questions.
I didn’t know there was such a device to file rings. I figured everyone did that by hand.

I’m starting to like the idea of a Koso 170cc 2-valve with a DHM 27/23 head.
No Worries blast away,,, hard to do by hand and still keep the edges perfectly square.

Koso 170 2v with a DHM head was my original plan and at the time David mentioned possibly working on a 28/24 valve set.
Might want to shoot him an email to see if he was able to make that happen. I feel the 170 is the most well rounded option when considering all factors.
 
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