usa registration only for fast accurate and easy product registration for all your dolmar products simply click the register link below and enter the required data . your dolmar power product will then be registered with dolmar and there will be no need to fill out the paper form supplied in the box with the product . registrations should be done within 30 days from date of purchase.register dolmar user survey dolmar power products would like to hear from you about your dolmar . click the begin survey below and once completed click the submit button.begin survey dolmar ps 6100 pictured above click here for product information dolmar 2 year warrantydolmar power products purchased for consumer use on or after april 1 2013 have a two year warranty.for more information on warranty policies click here sas stratified air scavengingthe process of stratified scavenging recovers 75 % of the unburned fuel normally lost by conventional 2 stroke exhaust and utilizes that fuel for power for greater efficiency and cleaner exhaust slr scavenging losses rejectionthe dolmar developed and patented process slr is the reduction of hydrocarbons and nitrogen oxides in the exhaust of 2 stroke engines . easy start the new easy start system integrates a spring loaded reel sfa which when released applies motion to the flywheel through the strongest resistance phase of the starting cycle and complement with mpi memory power ignition reduces the efforts required to start the engine . sfa spring force assistfirst pull of the rope loads the spring in the reel which releases at maximum load and begins the motion of the flywheel mpi memory power ignitionmpi technology is an integral function of the easy start system . a stored electrical charge from revolutions of the flywheel is released in subsequent starts . mm4 managed mini 4 strokethanks to innovative development the dolmar mm4 series of 4 stroke engines is the ideal power source for portable power equipment . technological advantages are noticeable at every level of performance both for the operator and for the environment 360 degree all position operationpatented unique lubrication system enables use of the mm4 engine in any position .