DetonatorTuning
Active Member
a few more hours of work this afternoon.
milled the mount flange on my DDM Dominator totally flat for a better seal at the engine port and reworked a previous exspansion chamber support bracket to deal with flange viberation, flex and bolt loosening.
new issue cropping up now that i am using more of the high rpms of the engine. been noticing a sheen of fuel behind and above the carb on the shrouding, no sign of where it comes from when engine is off.
while doing some tuning and using WOT on the bench i found it. these walbro carbs have a overflow/ bypass line out of the carb and back to the tank. while using other configurations i had deleted this line and left it open. since i wasn't using such high rpms nothing ever came out of it.
i had to rig up a catch bottle and replumb a line to it. used one of my old PRIMUS fuel bottles for now but will probably get enough line to make it back up front to the main tank.
not much else, bike is suprisingly smooth considering the jackshaft layout and very quick up to speed now that i'm using less overall reduction and letting it rev the way it wants.
interesting side note of that, while using 18.75-19.27 : 1 ratios i was doing my cruise speed at about 8600 rpm and getting real good mileage. now that i'm using the 20.91 :1 ratio i'm doing my cruise at 11,000rpm. the bike is very strong there, not losing any ground in headwinds or on grades and the mileage has improved like it did when i was using the shifter setup.
lights and all other features are remounted and i'm ready for another week of commuting.
more reports later,
steve
milled the mount flange on my DDM Dominator totally flat for a better seal at the engine port and reworked a previous exspansion chamber support bracket to deal with flange viberation, flex and bolt loosening.
new issue cropping up now that i am using more of the high rpms of the engine. been noticing a sheen of fuel behind and above the carb on the shrouding, no sign of where it comes from when engine is off.
while doing some tuning and using WOT on the bench i found it. these walbro carbs have a overflow/ bypass line out of the carb and back to the tank. while using other configurations i had deleted this line and left it open. since i wasn't using such high rpms nothing ever came out of it.
i had to rig up a catch bottle and replumb a line to it. used one of my old PRIMUS fuel bottles for now but will probably get enough line to make it back up front to the main tank.
not much else, bike is suprisingly smooth considering the jackshaft layout and very quick up to speed now that i'm using less overall reduction and letting it rev the way it wants.
interesting side note of that, while using 18.75-19.27 : 1 ratios i was doing my cruise speed at about 8600 rpm and getting real good mileage. now that i'm using the 20.91 :1 ratio i'm doing my cruise at 11,000rpm. the bike is very strong there, not losing any ground in headwinds or on grades and the mileage has improved like it did when i was using the shifter setup.
lights and all other features are remounted and i'm ready for another week of commuting.
more reports later,
steve
Last edited: