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Old 09-04-2012, 01:32 AM   #31
PSchrauber
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The slope of the aluminium tank is identical, it is some mm wider, as mentioned
there are metal tanks also of the later models in use, expecial in UK, these fit
perfect but are a little bit bulkier in overall design.

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Old 09-04-2012, 10:45 AM   #32
Twin-shocker
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Quote:
Originally Posted by PSchrauber View Post
The slope of the aluminium tank is identical, it is some mm wider, as mentioned
there are metal tanks also of the later models in use, expecial in UK, these fit
perfect but are a little bit bulkier in overall design.

Have you a picture of the very slim GRP tanks often fitted to tricked up Bults built recently in Spain?
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Old 09-04-2012, 11:33 AM   #33
PSchrauber
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See post #30, pic at the bottom.
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Old 09-04-2012, 11:52 AM   #34
bmwblake OP
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i don't have o-rings around the bolts for the petcock. there isn't a recess in the tank for them (if there ever was one). i have several different gasket materials that i've been trying. the last one was something that didn't enjoy contact with gasoline.

i've been trying to think of a way to get something inside the tank and work from there, but now that it's been plastic welded and is smooth i don't think it's a matter of the petcock not being held tightly enough i think the gasket just failed.

i'd like to not put the $350 into a tank if it isn't required. that's a quick fix i know, but where's the fun in not trying to fix what i already have in front of me?
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Old 09-04-2012, 02:59 PM   #35
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There isn't any recess in my tank body either!

There shoukd be a rubber seal inserted around the oval shaped upper base, (sorry for my english), of the petcock, That rubber seals the petcock to the gas tank, the surface of tank should therefor be very even were the petkock is attached.

When the base of the petcock is sealed at the "outer edge" there is no seal where the screws go through, therefor the petcock leaks if you haven't mounted oil seals.
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Old 09-04-2012, 03:34 PM   #36
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Quote:
Originally Posted by PSchrauber View Post
See post #30, pic at the bottom.
Thanks...................Is that GRP tank much narrower than than the plastic ones I wonder? Also I dont suppose if you have any idea whether a Model 59 tank is the same as the one used on the Astro?
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Old 09-04-2012, 04:15 PM   #37
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It's the same width, the white stripe makes the tank look narrower, the tank is btw. a litle bit wider downwards in the front, (doesn't affect steering angle).

Astro MX (depends to which model ) is beside the vent nearly the same, the model 59 Lobito enduro have the vent attached to the tank between the gas tap and the steering steam the Astro have the vent already attached to the gas tap.
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Old 09-04-2012, 11:51 PM   #38
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I asked the question about the M59 as wondering whether it would be worth making repro plastic tanks for these bikes, as I guess all the OE GRP tanks have probably rotted long ago. Dohhhhhhh.................my lack of knowledge of Bults led me to thinking a 69 Sherpa was a M59 rather than M49.............is the M49 tank the same as the ones used on things like early Pursangs, Astros etc (the breather vent seems different deffo).

Twin-shocker screwed with this post 09-05-2012 at 12:13 AM
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Old 09-10-2012, 09:31 AM   #39
PSchrauber
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Quote:
Originally Posted by Twin-shocker View Post
I asked the question about the M59 as wondering whether it would be worth making repro plastic tanks for these bikes, as I guess all the OE GRP tanks have probably rotted long ago. Dohhhhhhh.................my lack of knowledge of Bults led me to thinking a 69 Sherpa was a M59 rather than M49.............is the M49 tank the same as the ones used on things like early Pursangs, Astros etc (the breather vent seems different deffo).
I would say it does looks quite similar if the 49 wasn't fitted with the "kit campion". If it will fit (and the astro tank looks a little bit longer) ... well I haven't made any measurements for comparison and don't have an Astro model.
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Old 12-09-2012, 12:43 PM   #40
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so i bought a new tank and am ready to let this one go. it runs but i'm not going to have time to ride events anytime in the near future unless i can figure out how to mount a few car seats.

it's in the flea market.
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Old 12-09-2012, 04:53 PM   #41
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Looks sorted now:






Some people like trials for some this sport is probably too slow

Anyway very good that the bike is "saved" again.

The dents and marks are "commen" on such an old bike as these bikes have frequently bite into stone.

Thank you for the update.
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Old 12-10-2012, 06:30 AM   #42
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thanks for the comments. it's a fun bike but i'd rather it go to someone that will bang it on rocks versus letting it sit in my garage and get ridden maybe 2x a year.
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Old 06-29-2014, 06:47 PM   #43
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Guess what I got??




YOUR BIKE!
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Old 06-30-2014, 06:41 AM   #44
bmwblake OP
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I sold it to a guy from Alabama. Did you buy it from him?
I hope you're enjoying it.


Quote:
Originally Posted by trophymoto View Post
Guess what I got??




YOUR BIKE!
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Old 06-30-2014, 01:31 PM   #45
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got it in Lynchburg Tn. It was a buddy of Curt Comers.

Still sorting it out, hard start issue, carb seems fat on the bottom end, needs tires........
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