miss fire t25 1.6 ct air cooled

[SILVERFOX2013]

hi all names rob been owner of my first t25 camper project for 6 months now campers on the road but have a problem
i have a miss fire when under any load high revs and idle no miss but when im asking for some power she pulls back miss fires somtimes. engine has done this
since i got her any suggestions please
this is what iv done on engine so far its a 1.6 ct engine air cooled
1 new coil
2 new dist cap its has no contacter points
3 new set of bosch ht leads inc one to coil
4 new spark plugs
5 oil & filter change
6 new air filter
7 new engine bay fuel filter and fuel lines engine bay only
8 replaced all vacum advance pipes and checked vacume advance moves on distributor
9 new fuel pump and push rod
im begineg to run out of ideas as to what the problem is can any owners help thanks rob

[jason k]

Air leak on the inlet side? Check with wd40 when the motors running.

[SILVERFOX2013]

having a tinker today thanks for sugestion

[faggie]

rev limiter rotor arm breaking down fit standard one see if it improves

[SILVERFOX2013]

miss fire update got my self a mid priced timeing light and engine timeing was wayout 15 degs out so adjusted as book recomends
and was ruuning better after a short test drive still puling back & slight miss fire so after a bit of ummmmmmmmmmmmm
i put back the old ht leads and one to the coil test drove no change after 3 cups of tea's & couple of roll ups decided to put backthe old spark plugs after cleaning plugs another test drive and UREAKA! SORTED JOB DONE ME HAPPY BUNNY but just shows how even new components can be faulty
and out of 4 bosch plugs 2 were breaking down under load this realy took some time to find & realy had me stumpt

[faggie]

i would only ever use ngk plugs try a new set of these as had the same problem years ago with bosch plugs

[tobydog]

i would only ever use ngk plugs try a new set of these as had the same problem years ago with bosch plugs

I agree, always used NGK plugs since my FS1E days in the mid seventies.