Oil cooler from GS1150E on a GS1100E.

[posplayr]

Look for an entire 1150 assembly (cooler, hoses, banjo bolts) and an oil filter cover from that bike too (or a plug) and use the two factory outlet/inlets on either side of the oil filter cover. You might need to make a simple bracket, or modify the hole spacing on the 1150 cooler bracket to bolt it to your 1100.
Frankly I'm surprised to went to that big bore and the rest of the mods without using a cooler. Even with the 1150 cooler, a 1260 I rode (not mine) put out significant amounts of heat.
Post here in the Parts Wanted section, and maybe someone will have the 1150 parts for sale.

On a cold day in Santa Barbara (50 degrees), my 1166 will climb in temp to near 300 going 30-40 mph climbing to Camino Cielo. I did not have much of any concern on a recent trip to Mt Shasta and Oregon (2500 miles) last summer. But I would not try and ride without a decent cooler.

[bellucci]

Look for an entire 1150 assembly (cooler, hoses, banjo bolts) and an oil filter cover from that bike too (or a plug) and use the two factory outlet/inlets on either side of the oil filter cover. You might need to make a simple bracket, or modify the hole spacing on the 1150 cooler bracket to bolt it to your 1100.
Frankly I'm surprised to went to that big bore and the rest of the mods without using a cooler. Even with the 1150 cooler, a 1260 I rode (not mine) put out significant amounts of heat.
Post here in the Parts Wanted section, and maybe someone will have the 1150 parts for sale.

This bike was built in '86 and was owned by a friend... I rode it for one season. Then the meltdown commenced. I found a 1150 cooled on another forum with hoses but no bolts... I wil continue to search... Thanks for the reply

[bellucci]

On a cold day in Santa Barbara (50 degrees), my 1166 will climb in temp to near 300 going 30-40 mph climbing to Camino Cielo. I did not have much of any concern on a recent trip to Mt Shasta and Oregon (2500 miles) last summer. But I would not try and ride without a decent cooler.

Ray clued me in on the necessity of a cooler. I have all the paperwork from the builder of this bike and one of the notes was " A oil cooler is required for summer riding". The dyno sheet showed 181 hp at 9800 rpm so yes if was a hot runner...I hope to put it back together in the next few months. I have been collecting parts for over a year, and am getting close... Thanks for the reply.

[cdnoel]

Got the plug in.

I got the plug instaled and found the passage ways I was looking for to confirm that my oil would still keep flowing. Since I have my oil pan removed I discovered that the two oval shaped depresions in the front of the cover are the passage ways I was looking for. Once the hole is pluged on the right side of the cover the oil is send through the right depresion in the oil pan. Next it goes through the cooler and back into the left deprsion of the oil pan. After that it feeds into the oil filter.

Knowing this I would suggest that if you ever instal a cooler and use a plug in the oil filter cover make sure you do your own oil changes. I wouldn't be surprized if some mechanic would throw away the plug. Also if you fab up an oil pan gasket for yourself make sure you keep the oval shaped holes at the front. they are critical for any 1100 or 1150 with a cooler to keep the oil flowing through the filter.