I'm in the hot seat ( literally )

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I'm in the hot seat ( literally )

Post by imbroglio + » Fri Jun 23, 2017 12:22 am

Greetings to all,
I've lurked here for a long time, and finally last month bought a new 2016 SDR, it's a fun bike and I have put about 700 miles on it, no major problems so far, but I'm surprised nobody bitches about the impressive amount of heat emanating from below the seat, I found only one post addressing this issue. I'm getting a lot of it if I go below say 45 mph as in around town cruising. the back of my upper thighs feel medium well done after about 10 minutes of this type riding. I've had a number of bikes, including an old 1989 Harley 1200 Sportster, which got pretty warm but I believe this SDR has it beat in BTUs to the thighs in town. In Florida this time of year this isn't the best development.
So I'm wondering if the major heat source might be the cat or the rear cylinder header pipe. in which case an aftermarket pipe might help, or is it just the close proximity of the rear cyl head?

Any helpful advice guys??

Thanks,
Dan

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Re: I'm in the hot seat ( literally )

Post by Newjerseyduke » Fri Jun 23, 2017 2:01 am

Honestly, I have never felt heat coming off this engine. Sometimes for a few seconds I'll feel heat on my left shin as it blows through the radiator but that's it. What are your oil temps looking like. In summer weather 80's and 90's. I'm. Between 175 and 195. Only extreme heat and traffic gets it to 200. Mines a '15.
2015 SDR 1290

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Re: I'm in the hot seat ( literally )

Post by imbroglio + » Fri Jun 23, 2017 2:58 am

My temps will go up rapidly to over 200F and up to 215 riding in 1st or 2nd gear, maybe also 3rd, though it seems to at least stop increasing by 3rd gear. Makes me think it might be running lean in lower gears? The bike cools rapidly when I get up to 55 or 60 in 4th or 5th, down to 184 F . By then I'm not feeling the heat. I think it would get hotter in the lower gears if I were caught in traffic for a longer time, but I usually am able to go faster before that happens. I wasn't concerned too much about the 215 since I read the fans don't even come on till 221?

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Re: I'm in the hot seat ( literally )

Post by Newjerseyduke » Fri Jun 23, 2017 3:31 am

most of these bikes use some coolant for the first month or so as all the air is worked out of the system. i had to add to my overflow bottle a couple times when new. maybe yours is low. or maybe its just a new engine in hot weather. its cooling off when moving so probably just your environment.
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Re: I'm in the hot seat ( literally )

Post by HDKAWKTM » Fri Jun 23, 2017 11:36 am

We get mid to upper 90s here in SC and I dont see the heat issue. Now my Harley Ultra you want heat there is some serious heat.
Current Stable: 2015 SDR, 2013 Kawasaki Concours 14, 2011 Harley Ultra Limited "Clemson Tigers NCAA Football National Champs" :mrgreen:

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Re: I'm in the hot seat ( literally )

Post by Spiff » Fri Jun 23, 2017 12:38 pm

I'm in Vegas. Lately the engine feels like an air conditioner.

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Re: I'm in the hot seat ( literally )

Post by Vibral » Fri Jun 23, 2017 1:23 pm

Hey Dan,

I too had this problem. I just recently tapped up the bottom of my seat with this: https://www.amazon.com/dp/B0039Z5TYU/re ... tzbVEGMKYK

It's easy and I only did one layer with nearly half the roll left over. Took 5ish minutes?


It's been FANTASTIC. Huge reduction in actual seat temps. However I will warn you, that you will still get pockets of hot air on the sides of the seat in traffic but your actual butt will thank you.

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Re: I'm in the hot seat ( literally )

Post by imbroglio + » Fri Jun 23, 2017 2:43 pm

Spiff wrote:I'm in Vegas. Lately the engine feels like an air conditioner.

:lol:

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Re: I'm in the hot seat ( literally )

Post by imbroglio + » Fri Jun 23, 2017 2:50 pm

Vibral wrote:Hey Dan,

I too had this problem. I just recently tapped up the bottom of my seat with this: https://www.amazon.com/dp/B0039Z5TYU/re ... tzbVEGMKYK

It's easy and I only did one layer with nearly half the roll left over. Took 5ish minutes?


It's been FANTASTIC. Huge reduction in actual seat temps. However I will warn you, that you will still get pockets of hot air on the sides of the seat in traffic but your actual butt will thank you.
Hmmm. Thanks, I may as well give it a try, though most of my problem is my thighs right next to the seat, maybe it will help.

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Re: I'm in the hot seat ( literally )

Post by imbroglio + » Fri Jun 23, 2017 2:59 pm

So nobody noticed any engine heat difference after cat removal?

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Re: I'm in the hot seat ( literally )

Post by Vibral » Fri Jun 23, 2017 9:52 pm

imbroglio + wrote:
Hmmm. Thanks, I may as well give it a try, though most of my problem is my thighs right next to the seat, maybe it will help.
We've had some near 100 degree days here in CO and I ride in medium traffic for about 45 minutes home. So long as you aren't sitting still or are getting a breeze this has made all the difference for me. Though I have the KTM Powerparts ergo seat so I'm not sure if that is a contributing factor or not.

Sean

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Re: I'm in the hot seat ( literally )

Post by 5150 Pops » Sat Jun 24, 2017 3:49 am

imbroglio + wrote:So nobody noticed any engine heat difference after cat removal?
If you are going to find yourself riding in town with ANY high compression motorcycle from the last 20 years, you will have the same dreaded experience. It will be worse with a v-twin or v-4 and EVEN WORSE if it is either with full fairings...Panigale, RSV4.

The newer bikes, from the more recent years, have catalytic converters to make things even worse. Plus the ever tightening emissions regulations (all over the world) are essentially requiring the OEM's to tune their stock bikes as lean as possible, in order to meet those ever tightening emissions.

In 1998 I bought a Suzuki TL1000R, the stock headers would get so hot in stop and go traffic on Friday and Saturday nights in downtown Richmond, where we'd hang out, they would actually GLOW RED!
Yes RED, not orange. That shit waz HOT! Those bikes had less compression than our SuperDukes as well as full fairings, twin spar aluminum frame, (which the vertical spars actually jutted outwardly, making especially your right thigh, bacon) and about 30 Hp LESS than our bikes.

What's my point??? It could be far worse, this you speak of, is not as bad as you think.
Make a conscious effort to NEVER intentionally ride your bike in stop and go traffic, unless the ambient temperature is well below 70°F and you'll never feel like you're in the oven.

Getting rid of the cat will help some, but not enough, if you still choose to ride in town. Getting the Akrapovic map should help as well, since it richens the fuel mixture, which will alleviate some of the heat due to lean tuning in order to meet emissions.

Take a look at what these fellas had to say, about the uber-expensive 1299 SuperLeggera and it's radiating heat, at anything less than 80 mph!
https://youtu.be/6Ufcb14d3ug

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Re: I'm in the hot seat ( literally )

Post by 5150 Pops » Sat Jun 24, 2017 3:53 am

imbroglio + wrote:So nobody noticed any engine heat difference after cat removal?
To answer your original question, it's the rear cylinder (s) on Longitudinal V engines, that is responsible for the heat, much more so than catalytic converter.
Meant to point this out, in post above when referring to 1998 TL1000R, it had no Catalytic converter (s).

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Re: I'm in the hot seat ( literally )

Post by steve59 » Sun Jun 25, 2017 2:21 pm

since doing the cat delete and the akra map my oil temp hasn't gotten to 200f and usually sits around 195 in traffic and 175 rolling, chicago 'burbs can get to mid 90's with high humidity. I don't notice heat off this engine.
Enjoy

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Re: I'm in the hot seat ( literally )

Post by Gimlet » Sun Jun 25, 2017 2:49 pm

I only notice engine heat when I'm wearing textiles. Barely feel it in leathers. Not an issue either way. Its a V twin, you're sitting over the rear cylinder: it gets hot.

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Re: I'm in the hot seat ( literally )

Post by imbroglio + » Sun Jun 25, 2017 3:21 pm

I really think this stock bike is running lean in the first 3 gears and contributing to the heat. I have to get in 4th gear to see the oil temp go downward . I can go the same indicated speed in 3rd or 4th gear and the temp goes down only in 4th when it is at 200+.

Frustrating that my 2015 Vmax V4 with huge lump of a motor doesn't cook up the thighs like this little beast.
I think it is a matter of different airflow characteristics.
Oh well, I still can't stay off this SD..

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