Malossi 166 on a 2T: spark plug, oil, and fuel octane?

johnk · Post by **johnk** » Sat Jun 08, 2019 4:46 pm

I have a few quick questions about proper maintenance of a Stella 2T with a Malossi 166 kit. I didn't install the kitâ€”engine mods are way above my skill levelâ€”and I'm struggling to find consistent information online.

Is B7HS the correct NGK spark plug for it (as opposed to the B6ES recommended by the Stella manual)?

Should I be adding extra oil to the fuel tank? If so, exactly how much? (I gather the 2T adds oil at about 2%, but I've seen a few people say the Malossi needs more like 3% or 4%.)

Does the Malossi want 91 octane fuel or higher (as opposed to the 89 recommended by Genuine for the stock engine)?

Is there anything else I ought to be doing differently from stock? Thank you!

milly · Post by **milly** » Sun Jun 09, 2019 2:17 pm

Hi John,
Might be worth looking on facebook if you use it. There are a couple of U.K. forums on there that might be able to help with your questions.

youkiddin · Post by **youkiddin** » Sun Jun 09, 2019 6:19 pm

this looks like the manual for the 166 kit https://www.scooter-center.com/media/pd ... 17181_.pdf check your part numbers it you have any

2003stellaDave · Post by **2003stellaDave** » Wed Jun 12, 2019 7:15 pm

My 2003 Stella has a Malossi 166 on it. I just use regular gas and I donâ€™t add any extra 2 stroke oil. It runs fine.

Iâ€™m not sure what spark plug I have in it right now. Itâ€™s best to have a few different ones on hand. Hot summers usually mean a different plug.

Always carry a spare sparkplug and a small piece of sandpaper in the glovebox.

2003stellaDave · Post by **2003stellaDave** » Thu Jun 13, 2019 1:01 pm

I have a B8HS in mine.

BuddyRaton · Post by **BuddyRaton** » Fri Jun 14, 2019 8:23 pm

I run 7 or 8 in mine

The Malossi 166 is a hot kit. Hook it up with a 24/24 carb and expansion chamber and it will haul! I also have a P200 tree in mine.

I run 93 octane or 91 non-ethanol in all my 2T bikes. That kit likes high revs so it can heat up quickly. Higher octane delays detonation from heat.

I run 3% full synthetic..and I hammer that motor. At wide open throttle even an autolube is at a little over 3%. YMMV and I really don't want to start any oil war! Just letting you know that that's what I do.

I would suggest a Cylinder head temperature gauge (CHT) at a minimum. I also run an exhaust gas temperature gauge (EGT) and tach. Even so I have hard seized that motor twice.

Make sure your carb jetting is correct and it should be a great kit for scooting around on!

2003stellaDave · Post by **2003stellaDave** » Tue Jun 25, 2019 5:46 am

SIP Fast Flow Fuel tap.

15879000

BuddyRaton · Post by **BuddyRaton** » Tue Jul 02, 2019 1:11 pm

The BGM fast flow is a much better tap but on a 166 plenty of fuel will get to the carb. Why did I seize mine? Racing it cross country I do stupid things and blow up a motor every once in a while!