Honda TRX700XX Forum - Club700XX banner
1 - 20 of 23 Posts

·
Registered
Joined
·
51 Posts
Discussion Starter · #1 ·
Ok I have the 727 kit with pp head +1 valves 290 webcams full exhaust barkers cp12.5.1 piston Can I RUN 93 octane on the motor
 

·
Premium Member
Joined
·
2,487 Posts
No, I wouldnt...I wouldnt run pump gas on anything higher than 11:1 on a XX. Who did your PP on your head, what 727 bb kit do you have?
 

·
Premium Member
Joined
·
2,487 Posts
Cool. Where do you ride? I'm guessing from you saying 93 octane you are not from CA lol. Another member on here has the Thumper Racing BB too.
 

·
Premium Member
Joined
·
2,487 Posts
Orlando so what should I do ??? To run pump gas ???
Get a lower comp piston. I dont know that they make a 11:1 for the BB though.

Why do I see these 450 on a 12.??? Piston on pump gas
Someone other than me can anwser this better for you. I asked the same question as you when I was a stock bore running 12:1 and people I trust said it wouldnt be safe.
 

·
Registered
Joined
·
51 Posts
Discussion Starter · #8 ·
The thing I Email the guy from thumper racing and he told me yes and some people no FUCK!!!! Then in the forms it's the same shit lol
 

·
Registered
Joined
·
239 Posts
im running 93 on a cr125r i have and it is 15:1.1.... its just more sluggish and could cause a labor knock
 

·
Premium Member
Joined
·
2,487 Posts
Yeah when I had my first build done by Alba they told me it was fine to run on pump gas (12:1) then I talked to the guys on here and they said it wouldnt be safe especially since I ride in the dunes. A lot of people talked about the weight of the XX being part of the reason why it wouldnt be safe to do it on a XX but would be on a 450...But like I said im a retard when it comes to this stuff so I pay someone else to do it so I dont have to stress over it lol.
 

·
Premium Member
Joined
·
1,073 Posts
Personally I would not run under 100 octane with that high of a compression. I run an 11:1 piston and run 100 octane simply for peace of mind, and its alot better quality fuel than pump gas.
 

·
Registered
Joined
·
239 Posts
i prefer to run high octanes to a point.... if you go to high of a octane your wasting your money... my CR is setup for 110 octane but it will run on 93
 

·
Registered
Joined
·
821 Posts
I think with your cam and piston, your compression is probably in the 11:1 range. Forgot the website to the calculator I use to use.
 

·
Premium Member
Joined
·
1,073 Posts
Do you have a problem finding something higher than pump gas in your area?
 

·
Premium Member
Joined
·
88 Posts
off topic, but would it help or hurt anything to run ~100 octane in a motor with stock internals? If its that much better than "premium" pump gas i may start to look around for some out here.
 

·
Premium Member
Joined
·
520 Posts
Mine ping sometimes under hard load with a 11:1 cp with 91, but cylinder is shaved to get 0.045 of piston to head clearance.Now I use the klotz itrate and it's gone.With 12.5 I think you play with fire,google some pics of what detonation do ... Put at least 50/50 with race gas.
 

·
Premium Member
Joined
·
520 Posts
off topic, but would it help or hurt anything to run ~100 octane in a motor with stock internals? If its that much better than "premium" pump gas i may start to look around for some out here.
No need with stock compression ratio , too much octane is slowing combustion with low compression engine
 

·
Premium Member
Joined
·
88 Posts
good to know. Ill keep that in mind if i ever decide to go into the motor
 
1 - 20 of 23 Posts
Top