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Old 12-24-2012, 08:10 PM   #50551
Spud Rider
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Thanks for posting the great photos, Steve.

Pages 9-7 and 9-8 of the new Honda Common Service Manual describe how the automatic decompression system works.



This information is not available in the old version of the Honda Common Service Manual.

It appears the decompression cam will be held in place on the camshaft by the spring pressing it away from the camshaft. However, if the camshaft is tilted downward, the one-way roller bearing and the reverse decompression cam could fall off the end of the camshaft after the cam sprocket collar is removed.

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Spud Rider screwed with this post 12-24-2012 at 08:16 PM
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Old 12-24-2012, 11:25 PM   #50552
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Above & Beyond

Steve, Man you are awesome! So I wasn't worried about the 3 Decompressor springs, but rather that one that slid into the cam perpendicularly with a pin too. So was it like that spring was super light tension? That last picture was gold! Looks like I have that right. I'm suspicious of that o-ring on the pump now. I definitely put it in, but it was tattered. Something's making it a tad rattly up top.

This is why I love my XRL. It's the people!

Merry Christmas fellow BRPers!

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Old 12-24-2012, 11:40 PM   #50553
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Merry Christmas, everyone!

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Old 12-25-2012, 04:54 AM   #50554
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Merry Christmas, everyone!

Spud

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Old 12-25-2012, 06:07 AM   #50555
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Old 12-25-2012, 06:30 AM   #50556
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MERRY CHRISTMAS one and all !!!

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Old 12-25-2012, 06:31 AM   #50557
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Merry Christmas everybody!

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Old 12-25-2012, 06:59 AM   #50558
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RZRob,

Spring #6 can become a problem when it loses it's tension. My son's bike would not start when cold and I found that the engine would rotate around to TDC with a pressurized cylinder and not be able to get past TDC due to the decom not opening the right exhaust valve. I finally replaced that little spring and the engine would start normally again. I have a buddy's bike that is doing the exact same thing and we will be replacing the spring this coming week.

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Old 12-25-2012, 08:23 AM   #50559
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Merry Christmas Yall , .
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Old 12-25-2012, 08:35 AM   #50560
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Amen friend.... Being from Texas, isn't it All Y'all????

Merry Xmas to all!!!!!!
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Old 12-25-2012, 08:43 AM   #50561
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I am considering an XRL for its off road bias . Being air cooled, is it ever an issue with heat and riding slowly or idling ? thanks , Mark
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Old 12-25-2012, 08:59 AM   #50562
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Mine seems to run cooler at lower speeds.......perhaps my jetting is biased towards richer mixtures at lower throttle openings. Loads on the engine result in the highest temps for me. I am running dave's mods with the leanest recommended jets: 52/158 if I recall.
I have gone into the garage after a spring ride to hear the gas boiling in the gas tank (IMS 4.0)

I personally don't think additional finning or oil coolers are necessary on this bike as long as you take reasonable precautions to keep the bike cool. before I bought mine, the PO ran it 65 mph up Black Canyon hill on I17 year round and didn't frag the engine....that was with stock jetting
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Old 12-25-2012, 09:35 AM   #50563
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Quote:
Originally Posted by mcma111 View Post
RZRob,

Spring #6 can become a problem when it loses it's tension. My son's bike would not start when cold and I found that the engine would rotate around to TDC with a pressurized cylinder and not be able to get past TDC due to the decom not opening the right exhaust valve. I finally replaced that little spring and the engine would start normally again. I have a buddy's bike that is doing the exact same thing and we will be replacing the spring this coming week.

Thank you for posting the valuable information. That spring makes the decompression cam rotate counterclockwise at engine speeds less than 800 rpm, engaging the right exhaust valve. When the engine is running (with speeds greater than 800 rpm) that spring is compressed by centrifugal force, and the decompression cam rotates clockwise, disengaging from the right exhaust valve. That decompression spring costs less than $2. Therefore, I now plan to replace that spring with a new one every time I remove the camshaft for any reason.



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Old 12-25-2012, 09:56 AM   #50564
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Merry Christmas Everyone!!
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Old 12-25-2012, 09:59 AM   #50565
Spud Rider
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Quote:
Originally Posted by snofrog View Post
I am considering an XRL for its off road bias . Being air cooled, is it ever an issue with heat and riding slowly or idling ? thanks , Mark
Quote:
Originally Posted by EsconDeasy View Post
Mine seems to run cooler at lower speeds.......perhaps my jetting is biased towards richer mixtures at lower throttle openings. Loads on the engine result in the highest temps for me. I am running dave's mods with the leanest recommended jets: 52/158 if I recall.
I have gone into the garage after a spring ride to hear the gas boiling in the gas tank (IMS 4.0)

I personally don't think additional finning or oil coolers are necessary on this bike as long as you take reasonable precautions to keep the bike cool. before I bought mine, the PO ran it 65 mph up Black Canyon hill on I17 year round and didn't frag the engine....that was with stock jetting
Letting the engine idle, or riding slowly won't cause problems as long as engine rpms aren't high. However, riding at high rpms for extended periods of time can definitely cause problems, especially if you have removed the stock air scoops from the fuel tank.

If you ride prudently, and you don't remove the stock air scoops, you shouldn't have any problems. However, if you consistently ride the bike hard, you can definitely encounter problems. If you ride hard consistently and also remove the stock air scoops, your chances of overheating the engine increase significantly. Honda put the stock air scoops on the bike for a reason; they are very effective in lowering engine temperatures.

If you install an aftermarket fuel tank, the stock air scoops must be removed. If you remove the air scoops for any reason, and also ride the bike hard, it's prudent to consider installing an oil cooler or big-fin cylinder to compensate for the increased engine temperatures. If you install an oil dipstick thermometer on a bike with the stock fuel tank, you can document the difference in oil temperatures when the air scoops are removed, and re-installed.

Spud
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