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Quick question on EGT

Old Oct 15, 2013 | 01:39 PM
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Quick question on EGT

A-Hoy,
So, I got the pretty devil several weeks ago, and ridden as much as I can here in the God-Awful State of MN. Currently, 50 degrees and raining.
Which brings me to my question: Are the exhaust gas temps supposed to be different?
The other day I was running it on a cool wet day. I stopped for fuel, and laid my gloves on the pipes (cans) to dry a little, and warm up. I noticed that the LEFT side was noticeably warmer than the RIGHT side.
I'm thinking this cannot be good. Did I get screwed, and buy a bike that the rings are bad, or is the RIGHT side just cooler due to the fact that it is more exposed to forced air in front of the bottom cowling?!
PLEASE tell me I don't have to replace the rings, my wife will KILL me (not to mention it will be the third divorce....what can I say, I'm a lover.)
Old Oct 15, 2013 | 01:53 PM
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Originally Posted by SunsetSuper
A-Hoy,
So, I got the pretty devil several weeks ago, and ridden as much as I can here in the God-Awful State of MN. Currently, 50 degrees and raining.
Which brings me to my question: Are the exhaust gas temps supposed to be different?
The other day I was running it on a cool wet day. I stopped for fuel, and laid my gloves on the pipes (cans) to dry a little, and warm up. I noticed that the LEFT side was noticeably warmer than the RIGHT side.
I'm thinking this cannot be good. Did I get screwed, and buy a bike that the rings are bad, or is the RIGHT side just cooler due to the fact that it is more exposed to forced air in front of the bottom cowling?!
PLEASE tell me I don't have to replace the rings, my wife will KILL me (not to mention it will be the third divorce....what can I say, I'm a lover.)
the exhaust is not a true dual exhaust. its a 2 into 1 into 2 system, but the front cylinder does run cooler than the rear cylinder normally, which is part of the reason that the rear carb is jetted richer than the front to my knowledge. also the front pipe is longer giving the exhaust more time (and pipe to use as a heat sink) to cool than the rear would
Old Oct 15, 2013 | 02:53 PM
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If you were to pull the exhaust off and look inside at the junction shown in the picture, the right side exhaust is restricted by ~40%-50%. In the last three stock headers that I have had, all three were made the same way.

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Last edited by CruxGNZ; Oct 15, 2013 at 02:59 PM. Reason: spelling
Old Oct 15, 2013 | 02:54 PM
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Like insulinboy said it's a 2-1-2 system. It does not bleed into the mufflers at the same temp at all rpm's. At low rpm's (low backpressure) most of the exhaust from both cylinders is fed into the left can (the junction under the back of the pan does this) and then once rpm's builds up the pressure evens out and both cans will get to relatively similar temps. The real way to see if either of the cylinders are running cool is to put your hand near the exhaust right where it exits they cylinders (the header). Both should be too hot to touch. My guess is the bike was idling for a bit before you tested the temps, or you you were cruising at low rpm's before you tested.

As a side note, this is why people often have a hard time making a custom 2-1 exhaust for this bike. Whatever fluid dynamic design Honda did on the pipes and aribox is hard to replicate and improve upon unless you really know what you're doing.

Edit: I'm not so sure that the front pipe is longer than the rear... I think if you were to uncoil the rear one it would be longer than you'd guess... but that's just me, I haven't actually measured it out. It certainly has better exposure for cooling.

Last edited by 7moore7; Oct 15, 2013 at 02:57 PM.
Old Oct 15, 2013 | 05:01 PM
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I think both would be very close I length.
Old Oct 16, 2013 | 06:32 AM
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Originally Posted by CruxGNZ
If you were to pull the exhaust off and look inside at the junction shown in the picture, the right side exhaust is restricted by ~40%-50%. In the last three stock headers that I have had, all three were made the same way.

thats what i have seen too.
Old Oct 16, 2013 | 08:31 AM
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WHEW,

Thanks for relieving my fears. It is obvious after you guys pointed it out, Thanks for the information, and the patience.
Our season is quickly coming to an end, a quick 5 months until she'll see the 'hot' tar. I intend to get into the motor this winter/spring, install the Manual Cam Chain Tensioners, tear into the carbs (I was told when purchasing it had a stage 2 kit??? whatever that means), and play with the rear sprocket a bit.
I assume the compression numbers for each cylinder is in the manual?
Well, anyways...
THANK YOU!
Old Oct 16, 2013 | 09:29 AM
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Originally Posted by SunsetSuper
tear into the carbs (I was told when purchasing it had a stage 2 kit??? whatever that means),
You have unobtanium and the bike probably hits 140-145hp on that upgrade alone! How many speeding tickets do you have?

Originally Posted by SunsetSuper
I assume the compression numbers for each cylinder is in the manual?
Yep, somewhere around 160 as I recall.
Old Oct 16, 2013 | 01:54 PM
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Originally Posted by 7moore7
You have unobtanium and the bike probably hits 140-145hp on that upgrade alone! How many speeding tickets do you have?

Let's just say, no same or similar for the next 7 months. Which won't be too much of a problem as winter sets in. I've had it to 140 on the speedo, the gps clocked it at 136 max. speed. Adrenaline Overload.
I don't know for sure, how will I know? I would imagine jet sizes will tell the tail???? What does the 'kit' include. Personally, I think it is running a little fat. I would like to find the air screw adjustment tables and needle positions for the kit, but have NO idea where to find them. I'll find more when I dig into the carbs.

Yep, somewhere around 160 as I recall.
Perfect, thanks.
Old Oct 16, 2013 | 02:16 PM
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You'll be able to tell which kit is in there once you get in. FactoryPro and Dynojet are by far the most popular, and often coupled with a K&N filter to further induce tuning nightmares. The jets are labeled and members on here can identify which one you have pretty quickly based on alterations to the slides and springs. I'd suggest reading 8541Hawk's Carb Setup thread as a base if you haven't yet.
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