Hey everyone back again.
If you don't know im the guy that bought an 81 Herritage import thats had (for some reason) Wassel electronic Ignition fitted (meant for a Triumph/BSA) anyway i fixed the issue that had me here last time which was backfiring due to the wrong coil however the more i look into this bike the more i feel like ive bought a dog.
The aftermarket Mikunis that i had assumed were fake VM34's are, from what i can find, "mikuni 156-03" vm32's which i believe, are the carbs off of a T500 Titan 2 stroke... from 50 odd years ago, myeah explains why they look ancient. Barely runs with those on so I pulled them off and fitted what i assume, are the original Vacuum carbs that came with the bike and must also be around the same size since they fit on the same rubber manifolds as the VM32's. It idles and responds well with those vacuum carbs but i can not get it to rev out. It still refuses to rev past 4-5k rpm even if you hold it flat. With this Wassel system being not intended for this bike ive no clue if the timing is right since i have no useful timing marks but myself and my old man who has been working on bikes for longer than ive been alive, are both in agreement that its *probably* carbs.
Ive pulled these vacuum carbs apart and blown through every jet and checked the vacuum diaphragm and still the same but the fact the bike will sort of rev and push through the rpm "limit" if you back off the throttle and open again and again makes me think it wouldn't be timing especially since it starts so easily, infact another reason i suspect carbs is because it starts too easily, hear me out, i have never once had to use the choke in fact the bike dies or wont start if i use the choke when cold and it constantly blackens plugs even with the airbox off (tried with and without) which to me says these carbs are pig rich despite the bike having bigger headers on it, ive no idea what the internal diameter is buy the OD is circa 45mm which to my understanding is pretty big for an XS.
So really what im asking is, before i spend $800 (Aud) on a set of new VM34's setup from an XS from MikuniOz, is there anyone here with any thoughts on this not being the carbs at fault?
Cheers guys
If you don't know im the guy that bought an 81 Herritage import thats had (for some reason) Wassel electronic Ignition fitted (meant for a Triumph/BSA) anyway i fixed the issue that had me here last time which was backfiring due to the wrong coil however the more i look into this bike the more i feel like ive bought a dog.
The aftermarket Mikunis that i had assumed were fake VM34's are, from what i can find, "mikuni 156-03" vm32's which i believe, are the carbs off of a T500 Titan 2 stroke... from 50 odd years ago, myeah explains why they look ancient. Barely runs with those on so I pulled them off and fitted what i assume, are the original Vacuum carbs that came with the bike and must also be around the same size since they fit on the same rubber manifolds as the VM32's. It idles and responds well with those vacuum carbs but i can not get it to rev out. It still refuses to rev past 4-5k rpm even if you hold it flat. With this Wassel system being not intended for this bike ive no clue if the timing is right since i have no useful timing marks but myself and my old man who has been working on bikes for longer than ive been alive, are both in agreement that its *probably* carbs.
Ive pulled these vacuum carbs apart and blown through every jet and checked the vacuum diaphragm and still the same but the fact the bike will sort of rev and push through the rpm "limit" if you back off the throttle and open again and again makes me think it wouldn't be timing especially since it starts so easily, infact another reason i suspect carbs is because it starts too easily, hear me out, i have never once had to use the choke in fact the bike dies or wont start if i use the choke when cold and it constantly blackens plugs even with the airbox off (tried with and without) which to me says these carbs are pig rich despite the bike having bigger headers on it, ive no idea what the internal diameter is buy the OD is circa 45mm which to my understanding is pretty big for an XS.
So really what im asking is, before i spend $800 (Aud) on a set of new VM34's setup from an XS from MikuniOz, is there anyone here with any thoughts on this not being the carbs at fault?
Cheers guys
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