Valve Ticking/Adjustment Clearance Hawk

ballinparlay · 10-10-2016, 07:38 PM

Ive heard everything this side of the Mississippi on the correct valve clearance for the Hawk 250. Mine came with zero clearance on the intake and exhaust so I adjusted them today after about 500 miles to .006 on the intake and .007 for exhaust. The bike starts up better than ever but the ticking noise is pretty loud. Ive heard that you want some ticking, but I guess how much is too much? Very arbitrary without a decimal meter and legitimate science, now that Ive made this question as complicated as possible, what do yall's adjusted valves sounds like and is the sound prevalent even when accelerating and/or at higher RPMs?

humanbeing · 10-10-2016, 08:01 PM

Quote:

Originally Posted by ballinparlay

...adjusted them today after about 500 miles to .006 on the intake and .007 for exhaust..

Too wide!!! http://www.chinariders.net/showpost....78&postcount=2 | Honda shop manual https://josemaco.files.wordpress.com...h-62ktjam5.pdf of that design

Republic · 10-10-2016, 08:45 PM

My valves had zero clearance, I adjusted them both to .006. They are silent when cold but when the engine gets warm they are noticeable. Mine don't sound any louder than those I've watched in various Hawk videos on youtube, so I'm guessing I'm ok.

Before I adjusted them, the bike was very hard to start, now it starts immediately.

ben2go · 10-10-2016, 09:43 PM

The problems come when the ticking stops.

Ariel Red Hunter · 10-11-2016, 10:21 AM

Quote:

Originally Posted by ballinparlay

Ive heard everything this side of the Mississippi on the correct valve clearance for the Hawk 250. Mine came with zero clearance on the intake and exhaust so I adjusted them today after about 500 miles to .006 on the intake and .007 for exhaust. The bike starts up better than ever but the ticking noise is pretty loud. Ive heard that you want some ticking, but I guess how much is too much? Very arbitrary without a decimal meter and legitimate science, now that Ive made this question as complicated as possible, what do yall's adjusted valves sounds like and is the sound prevalent even when accelerating and/or at higher RPMs?

That's pretty loose. I think you will like .002 and .004, or .003 and .005 better.

ballinparlay · 10-11-2016, 06:38 PM

I re-adjusted to .002 and .003, it sounds much better and still starts easy as pie. Thanks for the info, guys

DGF · 10-12-2016, 11:37 AM

Complete rookie here so please excuse me if I'm missing the obvious, but why is the exhaust lash set higher than the intake? Would it be ok to set both at say .004"?

Dan

Weldangrind · 10-12-2016, 11:52 AM

Excellent question, Dan. It's common to give the exhaust side a little more expansion room, due to the extra heat.

wamey · 06-26-2017, 10:48 AM

Resurrecting an old thread, have there been any developments on the hawk valve clearances or is the RPS spec good? I see the manual lists them as 0.05mm, though I like the sound of ARH's recommendation of 0.03mm intake and 0.05mm exhaust better:

Weldangrind · 06-26-2017, 12:03 PM

It depends; are you looking for maximum performance or maximum longevity? I steer towards longevity and use the same spec for both valves. Tappy valves are happy valves.

pistolclass · 06-26-2017, 08:25 PM

40 psi rear......??? seems a little high. what do others run? I run 35 psi.

XDoubleXA · 06-27-2017, 08:31 AM

I run 32psi front, and back.

**JerryHawk250** · 06-27-2017, 10:07 AM

I set both at .05mm or .002".

Mudflap · 06-27-2017, 10:32 AM

Valve lash on CG engines increases as the engine heats up. If the valves are closed well enough to get it started you're not going to burn a valve. Some owners and shop manuals for CG engines call for .002" for both valves. Some call for .002" intake and .003" exhaust. The Honda shop manual for the original CG 125 calls for .003" on both valves. I use .002" on all my CG engines to keep them as quiet as possible but any clearance up to .005" shouldn't be a problem except for a bit of noise.

wamey · 06-27-2017, 01:10 PM

Quote:

Originally Posted by Weldangrind

It depends; are you looking for maximum performance or maximum longevity? I steer towards longevity and use the same spec for both valves. Tappy valves are happy valves.

0.05mm it is! Thanks all!

Also I run at 30 front 32 rear, no particular reason other than 40 is too much in my opinion.

10-10-2016, 07:38 PM	#1
ballinparlay Join Date: Sep 2016 Posts: 7	Valve Ticking/Adjustment Clearance Hawk Ive heard everything this side of the Mississippi on the correct valve clearance for the Hawk 250. Mine came with zero clearance on the intake and exhaust so I adjusted them today after about 500 miles to .006 on the intake and .007 for exhaust. The bike starts up better than ever but the ticking noise is pretty loud. Ive heard that you want some ticking, but I guess how much is too much? Very arbitrary without a decimal meter and legitimate science, now that Ive made this question as complicated as possible, what do yall's adjusted valves sounds like and is the sound prevalent even when accelerating and/or at higher RPMs?
	0

10-12-2016, 11:52 AM	#8
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Excellent question, Dan. It's common to give the exhaust side a little more expansion room, due to the extra heat. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	2

06-26-2017, 12:03 PM	#10
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	It depends; are you looking for maximum performance or maximum longevity? I steer towards longevity and use the same spec for both valves. Tappy valves are happy valves. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	2

06-27-2017, 10:07 AM	#13
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,555	I set both at .05mm or .002". __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	1

10-10-2016, 08:45 PM	#3
Republic Join Date: Jul 2015 Posts: 118	My valves had zero clearance, I adjusted them both to .006. They are silent when cold but when the engine gets warm they are noticeable. Mine don't sound any louder than those I've watched in various Hawk videos on youtube, so I'm guessing I'm ok. Before I adjusted them, the bike was very hard to start, now it starts immediately.
	2

10-10-2016, 09:43 PM	#4
ben2go Join Date: Jun 2011 Posts: 1,335	The problems come when the ticking stops.
	3

10-11-2016, 06:38 PM	#6
ballinparlay Join Date: Sep 2016 Posts: 7	I re-adjusted to .002 and .003, it sounds much better and still starts easy as pie. Thanks for the info, guys
	0

10-12-2016, 11:37 AM	#7
DGF Join Date: Aug 2016 Posts: 9	Complete rookie here so please excuse me if I'm missing the obvious, but why is the exhaust lash set higher than the intake? Would it be ok to set both at say .004"? Dan
	0

06-26-2017, 10:48 AM	#9
wamey Join Date: Jun 2017 Location: Madison, WI Posts: 96	Resurrecting an old thread, have there been any developments on the hawk valve clearances or is the RPS spec good? I see the manual lists them as 0.05mm, though I like the sound of ARH's recommendation of 0.03mm intake and 0.05mm exhaust better:
	0

06-26-2017, 08:25 PM	#11
pistolclass Join Date: Oct 2015 Location: connecticut Posts: 978	40 psi rear......??? seems a little high. what do others run? I run 35 psi.
	0

06-27-2017, 08:31 AM	#12
XDoubleXA Join Date: Apr 2017 Location: Ohio Posts: 89	I run 32psi front, and back.
	0

06-27-2017, 10:32 AM	#14
Mudflap Join Date: Sep 2014 Posts: 1,871	Valve lash on CG engines increases as the engine heats up. If the valves are closed well enough to get it started you're not going to burn a valve. Some owners and shop manuals for CG engines call for .002" for both valves. Some call for .002" intake and .003" exhaust. The Honda shop manual for the original CG 125 calls for .003" on both valves. I use .002" on all my CG engines to keep them as quiet as possible but any clearance up to .005" shouldn't be a problem except for a bit of noise.
	1