Did not see a side cover in your mod list,,, If you are running your oil cooler straight thru the head bolt??? that is your culprit...
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This is how I'm running my oil cooler, see attached picture. Do you think the after market Clutch Cover and adding the cooler return needed?
Side Question: Should my oil cooler be installed with the in/outlets on the the top (pic included) of the cooler or bottom like I have it currently?
![88383]()
Upside down kitaco oil cooler
So I picked up my Grom after its service and I had some parts fitted at the same time. I noticed the oil cooler was mounted from the bottom tappet with the hoses underneath and not the top (I bought a top mount kit...) but thought nothing of it. I put around 30 - 40 miles on the bike for a test...
www.hondagrom.net
If you grabbing the oil from the cylinder to the external oil cooler that is the worst place to do it from, grab the return lines from the the Kitaco clutch housing unit and plug up the holes on the cylinder.
second you need a good oil catch can system, takegawa oil catch can and return vent, this will reduce internal crank case pressure and heat from the engine.
I wrote a couple of posting about that from building my Takegawa 181-4v engine builds and now that I have moved on to building 2020 Benelli TNT 135, with BBK kits and also 450cc transplant engines which is a better platform mini-bike if you want a reliable running mini-bike.
I'm tired of always fixing my BBK kit groms and my last upgrade for my Takegawa 181-4v was having JE pistons build me for custom 4v piston before I moved on to my new Benelli projects.
Good Luck on your Fix.
![88386]()
second you need a good oil catch can system, takegawa oil catch can and return vent, this will reduce internal crank case pressure and heat from the engine.
I wrote a couple of posting about that from building my Takegawa 181-4v engine builds and now that I have moved on to building 2020 Benelli TNT 135, with BBK kits and also 450cc transplant engines which is a better platform mini-bike if you want a reliable running mini-bike.
I'm tired of always fixing my BBK kit groms and my last upgrade for my Takegawa 181-4v was having JE pistons build me for custom 4v piston before I moved on to my new Benelli projects.
Good Luck on your Fix.
So, because I was researching 186 BBKs and came across this thread, I reached out to @azninja250 to see if they ever sorted out the issue and got the following reply: "It turned out my temp/voltage gauge (Opmid OPMID "Version 2.0" M1011 M1013 Engine/Head Temperature Gauge w/ Voltmeter (Plug-n-Play) GEN2- '13-'20 Honda Grom / Grom SF ) was known for misreading 20-30 degrees on groms.
I found multiple forum posts like this ( OPMID temp issue or something else.. ) Where people had issues with Opmid plug and play temp sensor.
I never found a replacement for my Opmid but my Big Bore Kit worked fine for me up until I sold it.
FYI I also added a external oil cooler and that Kitaco Clutch cover with sythetic oil with cooler spark plugs, that in my mind also help a bit but with that Opmid sensor.. who really knew.. LoL"
So all was fine
I found multiple forum posts like this ( OPMID temp issue or something else.. ) Where people had issues with Opmid plug and play temp sensor.
I never found a replacement for my Opmid but my Big Bore Kit worked fine for me up until I sold it.
FYI I also added a external oil cooler and that Kitaco Clutch cover with sythetic oil with cooler spark plugs, that in my mind also help a bit but with that Opmid sensor.. who really knew.. LoL"
So all was fine
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