All summer i have been using syn3 in my street glide and decided to use Amsoil 20-50 and see how much cooler it might run. It now runs hotter? No issues all summer in central La with the over 100 deg temps and humidity. But now with the 70-80 deg temps and the Amsoil my bike is running hotter and at short stops at turn lights my bike will have the rear jug turn off and start the wierd idle like its tryinf to cool down. It didn't do this all summer with the syn 3? So i picked up a PCV and have the performance tune and the fuel eco tune and still running hot.
Should i try to goo back to syn3? The bike still runs great and stronger than ever with the new PCV fuel moto maps. I checked the fluid levels a couple of times and have put over 2500 miles since the change a couple of weeks ago. I also put amsoil 75-140 in the trans at the same time. And i'm using a K&N oil fiter instead of a harley brand filter. I havent changed the primary yet and its getting due. The trans wasn't due but i installed a +4 clutch cable and decided to go with amsoil in the trans while it was apart. I wanted to go with the redline heavy but it's not carried in my area.
Any ideas or am i missing something? I checked the level on the kickstand, 3 1/2 quarts.
need some imput here guys?

 

Dump the Amsoil, loose the Syn 3 and get some Mobil 1 V Twin if you want to treat the bike right. Put some Spectro platinum synthetic in the trans, you'll be glad you did.

It depends on what you added and in what order you added it. If you put the breather on and didn't do anything but the download, it will run hot. The stage 1 download is made specifically for the HD parts and could be lean for your setup but the PC should take care of that in any event as long as you have the right map.

 

I got Amsoil in my motor and had Syn 3 in before. I did'nt notice any change in temps, noise or how it ran. I use the Amsoil because I want to go 5000 miles between changes not 3000. That Syn 3 breaks down sooner than Amsoil and it's made by a dictator and I hate dictators.

 

I find it hard to believe that its the amsoil, in my nightrain all i ran was amsoil and it ran great. I'm wondering if it could be the k&n filter? Since thats the cheapest first step i'll go and pick up a harley brand filter and change them out to see if that was the issue.

I have been running syn 3 in all three holes, the breather, the stage one download and the rineharts for some months now and no heat issues. Before i took a 1000 mile trip up to Fayetteville AR for the BBB rally a couple weeks ago I changed out my clutch cable and trans fluid and while i was in the garage i decided to change the oil and filter. The next day i went to the rally and noticed it was running hotter, even on shorter trips. While i was up there i picked up the PCV from another member that was selling his in the classified section.
The whole trip back it was running hot so when we returned i checked the fluid levels to make sure they were correct. I still rode the bike to work for a couple of days while i was waiting on the maps for the PCV and it was still getting hot in the cooler temps.

When I ordered the maps i added that i had the stage 1 hd download. The bike has more power and runs smooth with the new maps but the temps are still high and if i stop at a light after riding for 20-30 mins it starts to go into over heat mode? It hasn't done this all summer in the high temps and now that it's 60's in the morning and i drive 25 mins to work in 40 mph areas here on post it shouldnt be getting this hot.

It was getting hot before the pcv so i'm ruling that out. I havent checked the plugs, could one of them be going bad? I'm getting ready to turn 9000 miles, could the lean stage 1 download have fouled a plug?

I'd hate to dump all this new costly oil to find out that it was something else. Any other ideas?

 

I seriously doubt the plugs could be the source of the problem. You can't tell anymore looking at the color of the plugs as to the mixture. Any running issues with the bike? Did the hot running start AFTER the stage download was done? Possible the wrong map was loaded by the dealer.

Put some gear oil in the trans and NOT the syn 3.

 

Thanks for the input but i don't see how where the oil comes from would make my bike run any hotter or cooler. I'm not looking for oil brand bashing, I run Amsoil in my Hemi and it runs cooler and smoother so i added it to the trans as well and it shift firmer and runs cooler as well.
I mentioned i ran it in my last bike with no issues.
Just looking for some logical reasons that would be making my ride run hotter from making a simple oil change. What else might i be missing??

 

I had the stage one download done before i picked up the bike back in March as well as the SE heavy breather intake and nightstick. Three months ago I changed out the stock headpipe with cat and nightstick and put the rinehart extreme true duals on and still had no issues, it even ran cooler because of the cat being removed.

The trans has Amsoil in it now not the syn 3, i put the heavier 75-140 in. Could that be causing the bike to run hotter?? I changed it the same time as i did the engine oil and filter.

 

It is scientificly proven that synthetic oil lowers engine tempurature by 10-15 degrees vs. dino oil. Your bike is not dialed in right if it is running hotter. I would check your tuner and reload the map or even try an alternative map. Maybe the PC is defective? It happens. I run Mobil 1 15-50 in the motor, 10-40 in the primary, and 75-90 in the tranny and my bike runs as cool as an air cooled engine can run.

 

I don't think the trans oil would/could effect the temp at all but one thing comes to mind is the filter you used. It's about the only thing in the equation that could have anything to do with the temps due to oil flow other than mapping. Just a shot in the dark here but that's about all I can see that would effect the temp other than sumping. Does the bike have any less noticable power?

Always look in the past for the last thing done before the problem started and it usually sheds some light on the problem at hand.

What was the last thing you did before the heat problem started?

 

The stuff i put in the trans was the Amsoil severe gear 75w-140. Is that the wrong stuff? It doesnt mention for motorcycle use, just heavier vehicals like big 4x4's Rv's and towing. Could this be the problem??