Valve ajust

msRandi · 02-03-2007, 05:57 PM

I did the first valve ajust. .05mm seeme to be tight. so I went with .10mm but that sounds a little loud. anyone knows what works best?
love from the big island

ob1 · 02-03-2007, 06:34 PM

.04-.05mm COLD is standard for most "Big 3" bikes.

Too much gap, you can lose performance and risk engine damage.

A pleasant "sewing machine" sound WHEN WARM is what you are looking for.

If the sewing sound goes away when the engine is at full operating temp, your valves may be being held open, and engine damage is sure to follow. The heat expansion of the valve train causes the gap to decrease.

stixx3969 · 02-04-2007, 11:24 PM

I've got about 300 mi on my Roketa DB-07A, When should I consider a valve adjustment and has anybody posted any step by step pics?

ejcycles · 02-06-2007, 08:56 AM

The Valves should be set at a .002 thousandths, or tight .003.

Bruce

bfe71730 · 02-06-2007, 09:11 PM

Here are the clearances that were for my Honda ATC 200x Exhaust: .03 to .05, Intake: .05 to .07. these were for an OHC engine, don't know if these will apply to having a pushrod engine, but I was gonna use these when I do my valve adjustment. Can anyone explain why Honda recommends the exhaust having a tighter clearance than the intake. Is it because of the heat? Just curious........

red2003 · 02-07-2007, 07:56 AM

Quote:

Originally Posted by bfe71730

Here are the clearances that were for my Honda ATC 200x Exhaust: .03 to .05, Intake: .05 to .07. these were for an OHC engine, don't know if these will apply to having a pushrod engine, but I was gonna use these when I do my valve adjustment. Can anyone explain why Honda recommends the exhaust having a tighter clearance than the intake. Is it because of the heat? Just curious........

Must be a misprint, the exhaust valve should be looser. It builds more heat and therefore expands more. The manual that came with my Roketa with the 200cc OHC motor says intake .05mm, exhaust .07mm.

bugsinteethbiker · 02-07-2007, 09:59 PM

I'm getting ready to check/set the valves on my QH200GY OHV engine. I've set valves on OHC Honda Engines before and am wondering if this is going to be tougher. Does the engine have to be lowered or removed to get the valve cover off or is there room? At a glance, it looks like it's going to be tight. I'd appreciate it if someone could give me an idea of what I'm getting into. :?

Thanks! Bill

ejcycles · 02-08-2007, 03:21 AM

Hi Bill
Yes the covers are tight to remove sometimes. If you have a pushrod engine , remove the bolts from the cover. Lift the cover and move it towards the right side of the engine, tap it on the left side with a rubber mallet and it will pop right out from between the engine and the frame.

By the way...all of these engines are {OHV...Over Head Valve}. The difference is there are Pushrod engines and {OHC...Over Head Cam} engines that have the camshaft over the valve train run by a timing chain. Just some technical information, I hope this helps.

Bruce

RPM · 02-08-2007, 08:37 AM

With the QH200GY bikes that I sell, Hi-Bird, you have to remove the front engine mount and the front lower mount bolt and loosen the other upper rear mount bolt in order to tilt the engine forward to get enough clearence. I tried everything to get around this, but it is just too close in the frame and this is the only way to remove the cover on these pushrod engines.
Some owners have reported that they actually grind down some of the ribs from the top of the cover to modify for more clearence and seems to work for them, I personally do not recommend doing this as it was casted there for a purpose, to pull heat from this area of the engine. Your bike, your choice, but if you have warranty to deal with, you wouldn't want to do that just yet.

Akonababe · 02-08-2007, 01:50 PM

On our vivas we just had to lift the back of the tank slightly and the cover came out, but it was a little tight. Ride hard and have fun.

02-03-2007, 05:57 PM	#1
msRandi Join Date: Jan 2007 Location: Douglas, AZ Posts: 220	Valve ajust I did the first valve ajust. .05mm seeme to be tight. so I went with .10mm but that sounds a little loud. anyone knows what works best? love from the big island
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02-06-2007, 08:56 AM	#4
ejcycles Join Date: Oct 2006 Location: 11481 State Route 44 Mantua, Ohio 44255 Posts: 1,112	The Valves should be set at a .002 thousandths, or tight .003. Bruce __________________ Thanks, Bruce @ Endless Journey Cycles "Phone Calls Only" ~330-274-0098~ Hours: Tue.-Fri. 10:00-6:00 Sat. 10:00-4:00 EST. Dealer for: Lifan, Crossrunner ATVs. http://www.endlessjourneycycles.net
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02-06-2007, 09:11 PM	#5
bfe71730 Join Date: May 2006 Location: South Arkansas Posts: 198	Here are the clearances that were for my Honda ATC 200x Exhaust: .03 to .05, Intake: .05 to .07. these were for an OHC engine, don't know if these will apply to having a pushrod engine, but I was gonna use these when I do my valve adjustment. Can anyone explain why Honda recommends the exhaust having a tighter clearance than the intake. Is it because of the heat? Just curious........ __________________ 2004 KAZUMA CHEETAH 200 2001 Yamaha Big Bear 400 1986 Honda ATC 250ES 1983 Honda ATC 200X 1974 Kawasaki KE100
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02-07-2007, 09:59 PM	#7
bugsinteethbiker Join Date: Feb 2007 Posts: 1	valve adjustment on a Hi-Bird QH200GY OHV Engine I'm getting ready to check/set the valves on my QH200GY OHV engine. I've set valves on OHC Honda Engines before and am wondering if this is going to be tougher. Does the engine have to be lowered or removed to get the valve cover off or is there room? At a glance, it looks like it's going to be tight. I'd appreciate it if someone could give me an idea of what I'm getting into. :? Thanks! Bill
	0

02-08-2007, 03:21 AM	#8
ejcycles Join Date: Oct 2006 Location: 11481 State Route 44 Mantua, Ohio 44255 Posts: 1,112	Hi Bill Yes the covers are tight to remove sometimes. If you have a pushrod engine , remove the bolts from the cover. Lift the cover and move it towards the right side of the engine, tap it on the left side with a rubber mallet and it will pop right out from between the engine and the frame. By the way...all of these engines are {OHV...Over Head Valve}. The difference is there are Pushrod engines and {OHC...Over Head Cam} engines that have the camshaft over the valve train run by a timing chain. Just some technical information, I hope this helps. Bruce __________________ Thanks, Bruce @ Endless Journey Cycles "Phone Calls Only" ~330-274-0098~ Hours: Tue.-Fri. 10:00-6:00 Sat. 10:00-4:00 EST. Dealer for: Lifan, Crossrunner ATVs. http://www.endlessjourneycycles.net
	0

02-03-2007, 06:34 PM	#2
ob1 Join Date: Jul 2006 Posts: 499	.04-.05mm COLD is standard for most "Big 3" bikes. Too much gap, you can lose performance and risk engine damage. A pleasant "sewing machine" sound WHEN WARM is what you are looking for. If the sewing sound goes away when the engine is at full operating temp, your valves may be being held open, and engine damage is sure to follow. The heat expansion of the valve train causes the gap to decrease.
	0

02-04-2007, 11:24 PM	#3
stixx3969 Join Date: Jul 2006 Posts: 146	I've got about 300 mi on my Roketa DB-07A, When should I consider a valve adjustment and has anybody posted any step by step pics?
	0

02-08-2007, 08:37 AM	#9
RPM Join Date: Jun 2006 Location: Grenada, MS Posts: 259	With the QH200GY bikes that I sell, Hi-Bird, you have to remove the front engine mount and the front lower mount bolt and loosen the other upper rear mount bolt in order to tilt the engine forward to get enough clearence. I tried everything to get around this, but it is just too close in the frame and this is the only way to remove the cover on these pushrod engines. Some owners have reported that they actually grind down some of the ribs from the top of the cover to modify for more clearence and seems to work for them, I personally do not recommend doing this as it was casted there for a purpose, to pull heat from this area of the engine. Your bike, your choice, but if you have warranty to deal with, you wouldn't want to do that just yet. __________________ RPM - REV IT UP! (REDLINE is OPTIONAL) Feel the RUSH ... it gets better all the time!
	0

02-08-2007, 01:50 PM	#10
Akonababe Join Date: Dec 2006 Location: Douglas, Arizona Posts: 154	On our vivas we just had to lift the back of the tank slightly and the cover came out, but it was a little tight. Ride hard and have fun.
	0