They are both 3.6x230mm although the head or and the angle may be different, you’d think the part number would the same if there wasn’t any difference. That 86 number is the part number for m91/92 front inner spoke as well.
My late model 49 has a G stamped in the same spot I don’t know what it means but we could always make up a story that it means Works Super Special but really it probably means George stamped it as it left the factory
Looks to me your original frame mounted sidestand bracket is on the right side
if the swing arm bracket is on the opposite side the bracket would have been welded on later I’m pretty sure no Bultaco had a stand on the chain side
Those mounting lugs are interesting are they buffer mounts like the ones behind the headstock you’d have to wonder what sort of tank/seat it had on it. They are not even opposite each other.
mrb505, your bike is a bitza as you have stated but looks really good, what is the frame ? Is it a modified 183 frame? I like the look of that substantial alloy bash plate.
Yes it’s a 183 frame when I bought it the tubes underneath were totally squashed so I cut them off and tried to replicate it to a 199a style, the bash plate I bought from todotrial I also cut the foot pegs off and mounted gas gas ones a bit further down and back
The problem is that I clear coated over the sticker I’ll redo the tank maybe one day but the bike isn’t very original anyway and as it’s a regular rider it wears a plastic tank most of the time
If you want it authentic a 158 shouldn’t have a sherpa sticker on the tank pretty sure they had the 1975 world champion sticker instead
The sherpa sticker is from 198/199 models yours should have the round sherpa t on the side panels I’m not too sure if your model had the made in Spain sticker either
If you bought the stickers in a kit you’ll probably find the the Bultaco tank sticker smaller in height and length than the original, in those kits they are 198/199 size
Here is one type of M49 rear hub. I just measured the liner of this one as 144mm OD. Nominal ID is 140mm. I am planning plan to machine this one out to either no grooves or a maximum of 142mm ID with some grooves remaining.
There is another type of M49 rear hub fitted to early build M49s that I will post up a photo of later if you think it is helpful. This earlier hub has a liner with the same nominal ID (140mm) but has a much bigger OD (147mm)
That’s interesting David is there much visual difference between the hubs
Woody is right they need a short length of pipe welded to the inlet about 11/8 od x 11/4 ish long
They are louder but I think a much nicer sound the reproduction ones seem a bit louder than the original bananas I have a reproduction one on my 183 and a cleaned and repacked original on a 125.
I bought a new set of Bultaco betor forks with clamps out of the US a few years ago still in the box they were stamped Bultaco but the same style clamps as SWM / Italjet I guess unclaimed from the broke company
I think the 158 182 190 tubes are only about 10mm shorter but the rods are also 10mm shorter as well so they use the same length springs as the 350’s of that era or maybe even all Sherpas
Id probably just cut those 500+ Pursang springs down to a suitable length
All the sherpa springs I’ve measured are between 450 to 475mm long
Should have 2 8x20x62 studs in the barrel but 8x45 bolt should do
with the header pipe I'd be getting one made up for your bike all the header pipes are slightly different even for individual models so for a 27 in a 49 frame I doubt you'll get one that will fit nicely
Woody I'm pretty sure all the 325's from m125 on had the same flywheels around 2.8 kg on both sides your 159 may have been modified if it had a pursang primary flywheel
If your talking about ignition side you might not want a m49 ( VAR41-9)flywheel about 2.4kg against 2.8kg that you probably have now (VAR41-52)) where as the 250 later flywheels (VAR41-51) m124 on are around 1.7kg. Well that's from my scales they probably vary a little bit.
A lot of 250/350 Alpinas (m137 on I think) had the VAR41-51 flywheels so it might be easier to find one from a Alpina as there seems to be a fair amount of Alpina parts on eBay in the states.
Anybody know what part numbers 86-04-003/5 are?
in Bultaco
Posted
They are both 3.6x230mm although the head or and the angle may be different, you’d think the part number would the same if there wasn’t any difference. That 86 number is the part number for m91/92 front inner spoke as well.