Athena Big bore kit

[Springbok]

I installed a Athena big bore kit (493cc)on my K8. The quad feels weaker than my K7 standard quad. I took it to the dyno to install the Power commander and the guy who tested it says that I will have to run a higher octane fuel,because I am getting something like pre-ignition. The kit has a 13.1 : 1 compression ratio. Have anyone had the same problems?? I am running pump gas unleaded 95.

[kfx400rider03]

that not even enough octane that they recomend you to run on a stock ltr. recomened amount is 97-98. and you probaly shjould use even high octane rating for you bore kit too

[09ltr450]

you need to run race fuel with a 13:1 piston 110 112 octane

[Springbok]

We only get 98 octane race fuel max in South Africa. Our pump fuel goes up tp 95 octane max next to the coast,inland only 93 octane.We manage to sort out the pinging (ignition) problem with NF octane booster. The horsepower is on 52 now with the big bore kit,head ported, power commander 3 and Dasa pipe. Torque is on about 42 NM. The AF ratio is set on 13 below 7000 rpm and on 12.8 from 7000rpm up. Dont know what you guys run.It is set little bit richer to keep the piston cool for our offroad racing, where you are at wide open throttle for 5km or so on some stretches.Dont know if it makes sence ,but lets hear from the experts!!!

[tlronny]

Friend has that kit with porting etc and it runs just fine on 95 for what its worth !

[Springbok]

It only did that after getting really hot on the dino(about 2 hour test),but in any case it is sorted now.

[ltr450beau]

i have the same kit and i had my quad dyno tuned to run on e85 i had to find the right fule injector to get it to un right first 2 ran out of fuel ot 50% and 70 % throtle but now we got the right one we need and runs great i have about 20 hours on it and it will out run most quads in my area
:devil:

[Springbok]

I now have 43 hours on the clock. I removed the head today to replace the valves and removed the piston to have a look. Athena says that the piston must be changed after 16 hours,but the piston looks new and all measurements still standard. I am running it till I start using oil or loose power. My fueling seems to be good with the NF octane booster.

[panici33]

Hey Springbok,

I am sure you checked, but just in case, on the VP Racing Fuel website there is a place in Gauteng that sells VP where you could get higher octane race fuel and not have to use the additive. You will probably get better performance with the race fuel, IMO.


VR Performance Products

Gauteng, South Africa
Phone: 27-117-62-5431
nicovr@netactive.co.za

[Springbok]

I heard the VP fuel is very good,but very expensive. Another thing,I am in Cape Town and with transport not really worth it.I use about 60L on a national!

[panici33]

Maybe, when the U.S dollar becomes even less valuable.:D