I just discovered, after 25 years of ownership, that my R is supposed to run on 93 octane gas. Didn't believe it until I found it in the manual. I've always used 87. Why would such a low compression ratio motor need 93? What do others run?
Just Too Addicted
Arm chair racerJust too addicted
I just discovered, after 25 years of ownership, that my R is supposed to run on 93 octane gas. Didn't believe it until I found it in the manual. I've always used 87. Why would such a low compression ratio motor need 93? What do others run?
__________________
'85 ATC250R
.030 Over Wiseco
FMF Pipe/Answer silencer
36PJ Keihin
K&N
Boyesen reeds
Magura hydraulic clutch
Roost Boost
MSR bars
OMF swingarm skid
ITP Beadlocks
Three Wheelin' Since '84
Power User
Teaching quads a lesson
I run a 91 octane 100% with Castrol 927 mixed at 32:1. Stock motor with a Woods Type 6 pipe. No blended gas!!!!
At The Back Of The Pack
Arm chair racerAt the back of the pack
Premium gas keeps your motor happy. Lower temps and better performance. It will make the piston last longer too. Its totally worth the extra cost.
Shart Guard .......Use it !
Pink Powerwheels Barbie trike
Wamo Big Wheel with a solid trikecycle front tire
Mini bike 3hp Briggs and Stratton with cambells soup can exhaust
Schwinn stingray with coaster brakes
1985 Crash and Burn champ
1st place National Endo Championship
At The Back Of The Pack
Arm chair racerFirst time rider
always run premium!!! I cannot stress that enough.
ALSO find a fuel without ETHANOL!! ethanol is a carb killer.. There is still one or 2 places where premium doesn't have ethanol!
Got The Holeshot
Arm chair racerJust too addicted
The Honda Manual states 92-100 ,RON. (to be specific)
-& thats on stock motor!
Previously Owned:
1985 ATC 250R (261cc)- 38MM PWK QV/AS, VFORCE3, RPM TIMING ADV., FULL DG EXH, CLARKE WHITE TANK, DOUGLAS RED LABELS, PRM NERF BARS, + ALUM. PARTS
1983 ATC 185S (186cc)- HI COMP., BASSANI HEADER, REAR DISC BRAKE CONV., '86 200X HUBS, ALUM. RIMS, DIRT DEVILS
1982 ATC 185S (224cc)- PK WELD-ON KIT, PK CLAMPS, PK EXHAUST, SL90 SHOCKS, OIL COOLER, PCCC RIMS
1981 ATC 185S
1984 ATC 250R
1981 ATC 250R
1983 ATC 110
1969 HONDA MINI TRAIL 50
TRIKELESS
Trikein' Away
Lord of the trike
Although most people do, it's best not to think of compression ratio as the determining factor in the level of octane any engine needs to run at peak levels.Originally Posted by 250rAL
For example an engine with a "low" advertised CR may have a different flow pattern or combustion chamber design than an engine with a "high" advertised CR, and along with different static compression and other factors in design, may sometimes require a higher octane fuel to run at peak levels.
The misconception that "high" CR ALWAYS equals the need for high octane is fueled by the fact that when you increase the compression ratio on any given engine, you will very likely increase the octane requirement for THAT particular engine.
Power User
Got the holeshot
I use 91 non-ethol in all my toys. Most gas stations around my area sell the 91 non-ethol now. Iv used Cam2 115 octain in my 250rs before with no issue.And my Quadsport.
250r rules
Just Too Addicted
Arm chair racerJust too addicted
I use 91 pump gas and vp c12 50/50 mix with 32:1 yamalube. I did not want to take chance on my 86 atc 250R after I installed the 85 head gasket that raised my compression to 190lbs
Just Too Addicted
Arm chair racerJust too addicted
How about octane boosters?
__________________
'85 ATC250R
.030 Over Wiseco
FMF Pipe/Answer silencer
36PJ Keihin
K&N
Boyesen reeds
Magura hydraulic clutch
Roost Boost
MSR bars
OMF swingarm skid
ITP Beadlocks
Three Wheelin' Since '84
Trikein' Away
Lord of the trike
Octane boosters will only work with purple powerbands.....
Why use a cheap mystery fluid in your bike? Just buy the right fuel!
Reply With Quote