dubSolo's re-Build and other...
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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! 💪😎🔥
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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! 💪😎🔥
Joined
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820 Posts
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.
I’m starting to like the idea of a Koso 170cc 2-valve with a DHM 27/23 head.
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1,123 Posts
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.
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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820 Posts
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.
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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1,123 Posts
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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8,369 Posts
Nice going glad you guys are upgrading the bar on BBK kit groms, Ride safe
Any updates? Inquiring minds and all that.
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1,123 Posts
Not much really only 101miles on new set up all under 11,000 Rpm. Have run both neo and tb cam. Currently waiting for David to send me one of his cams to see if it clears a neo head.
Can easily hit 84mph with gear ratio 2.40 but recently switched to ratio 2.25. Have a Crush the Coast ride coming up and that route will give the opportunity to see what she's got.
Can easily hit 84mph with gear ratio 2.40 but recently switched to ratio 2.25. Have a Crush the Coast ride coming up and that route will give the opportunity to see what she's got.
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820 Posts
Neat. Sounds good. I haven’t seen you on here in a while. I’ve been coming and going myself. 84mph...talk about having no trouble keeping up with highway traffic. Very nice.
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1,123 Posts
Thanks!
Definitely not regretting it, very well rounded on performance.
I was happy with my 170 2v until my friends built their 170 4v motors, now they're eating my lunch in the top end. I can't go 4v because the head will hit my front tire, and I like my lowrider grom too much to raise it back up.
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