having difficulty seeing how detonation would be caused by the octane level
recommended by honda.. mine has been running on 91RON [= 87PON apprx]
no ethanol for about 18mths with no pinging or detonation, completely stock
and also with a lv evoII slip-on the last 3 - 4 mths..
petrol may be contaminated, esp with water if it includes ethanol..
another factor possible being lugging the engine, such as throttling
from low rpm in higher gears thus overloading the engine causing
increased pressure.. over-lean fuel mix is a factor, together with
high temperature.. i have a slip-on exhaust which should increase
flow to some extent, yet without pinging [or detonation] in over
3 mths, same routes, same petrol etc..
reported rev range of around 5500rpm sounds high enough revs
to preclude lugging the engine, unless this is in top gear
and is part way thru the acceleration sequence, not the start..
it would be interesting to see if using higher rev ranges
for the same gears, and not, starting power uptake
at low revs, has any effect on these 'rattling' engines..
this [pinging, detonation, pre-ignition] should be apparent
to honda mechanics.. interesting if it does not occur
when the same bike is ridden by a honda mechanic..
also interesting if those using richer fuel mix/mapping
with power commanders etc have eliminated their 'rattle'..
recommended by honda.. mine has been running on 91RON [= 87PON apprx]
no ethanol for about 18mths with no pinging or detonation, completely stock
and also with a lv evoII slip-on the last 3 - 4 mths..
petrol may be contaminated, esp with water if it includes ethanol..
another factor possible being lugging the engine, such as throttling
from low rpm in higher gears thus overloading the engine causing
increased pressure.. over-lean fuel mix is a factor, together with
high temperature.. i have a slip-on exhaust which should increase
flow to some extent, yet without pinging [or detonation] in over
3 mths, same routes, same petrol etc..
reported rev range of around 5500rpm sounds high enough revs
to preclude lugging the engine, unless this is in top gear
and is part way thru the acceleration sequence, not the start..
it would be interesting to see if using higher rev ranges
for the same gears, and not, starting power uptake
at low revs, has any effect on these 'rattling' engines..
this [pinging, detonation, pre-ignition] should be apparent
to honda mechanics.. interesting if it does not occur
when the same bike is ridden by a honda mechanic..
also interesting if those using richer fuel mix/mapping
with power commanders etc have eliminated their 'rattle'..