Oil

[b_watts3]

wat kind of oil should i run in a 400ex with a high compression piston bored 2 416, a hmf slip on, and k&n airfilter????????

[Rico]

Synthetic ....... :macho

[jsmith2232]

I just ordered some bel-ray thumper racing oil, it's sopposed to be here tonight but from what i hear it's pretty good stuff. I don't know if it is true, maybe someone else can help me out with this also but i heard your not sopposed to break a motor in with synthetic?:confused:

[jeremy_283]

just run the same......... wats so great about synthetic?

[Rico]

Originally posted by extremejrowe
just run the same......... wats so great about synthetic?

Go read up on it www.amsoil.com

[underpowered]

I use Rotella T Heavy Duty oil, 15w-40. Best stuff out there, inexpensive as well.

I use opti-4 racing oil and I have a 14:1 compression piston and a 440, with a Sparks full system and a pro design... Bel-Ray Thumper oil is good and I used it for 6 months or so but I have been using Opti-4 racing oil for 1 year and 4 months and i have had NO problems with my 4-wheeler anywhere and before I had alot I havent even had a battery problem but Opti-4 wont change that but still I love Opti-4 cheaper then Bel-Ray and better!!

[Joe400ex]

My buddy has a shee and he rode my 400 the other day. He says that it is hard to shift. I dont notice it, but could it be from the oil im running. Also i have a stock bore. What is the best oil to run and were can i get it. thanx

Joe400ex

[Rico]

I can't say what is the best oil, but I can say that any synthetic brand is 100% better than any petroleum based oil.

I like Amsoil myself........:o