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#Post#: 2900--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: February 14, 2021, 9:07 am
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That's a really helpful post Plodder. I don't see me ever
fitting one, but I'm sure it will be some help to those who
might 8)
#Post#: 2925--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: March 31, 2022, 4:04 am
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I wish I had remembered that this thread was one here, having
spent the past few days trying to fix the Dynastart on an
ex-Police bike I picked up before lockdown, and which turned out
to be in considerably worse condition than described. In a sulk,
I pushed it away and pretended it wasn't there, until last year,
when a minor issue with my other one forced me to pull it out.
To cut a long story short, the Dynastart didn't work, and some
minor investigation revealed that the belt was slipping, and too
slack, even on maximum adjustment. Some more investigation
revealed that the belt was too small to fit over the flywheel,
but despite attacking the locking ring with my impact gun, it
refused to loosen off, so I reverted to kickstart, and forgot
about it again. This month, I was doing some more work, to
replace the coil and condenser to try and resolve a persistent
misfire at low rpm, and decided to have another go at the
flywheel. This time I locked the flywheel using a standard
G-clamp, bearing on the kickstart, with a sheet of lead flashing
between for protection. The locking ring was already chewed up
badly where someone had attacked it with a chisel, so I selected
a blunt punch and with the flywheel locked, it came loose
easily. Reversing the clamp to the front of the flywheel, and
bearing onto the frame (lead sheet again) got the retaining nut
loose, and bearing against the locking ring, drew the flywheel
easily off it's taper, after I had given it a couple of sharp
taps on the circumference to break the taper.
HTML https://live.staticflickr.com/65535/51973455315_8f1942c8e9_k.jpg
HTML https://flic.kr/p/2nbHxxaIMG_4557
HTML https://flic.kr/p/2nbHxxa
by bancquo
HTML https://www.flickr.com/photos/17279292@N03/
Having forgotten the existence of this thread, I had to
'reinvent the wheel' and guess the smaller size of belt
required. I went for 637mm (25") and a 10mm width cogged type
(XPZ637).
HTML https://live.staticflickr.com/65535/51971887442_4e8da2b884_k.jpg
HTML https://flic.kr/p/2nbzvsSIMG_4556
HTML https://flic.kr/p/2nbzvsS
by bancquo
HTML https://www.flickr.com/photos/17279292@N03/
When I first put it on, I couldn't get it over my ;pulley, which
is about 72mm outside diameter, even with the adjusting bolt
removed. However, I discovered that the clutch cable, which is
routed below the body of the Dynastart, was preventing it from
lowering to the casing. After removing the cable, I managed to
get the belt on, and job done. Next is to replace the hideous
and dangerous solenoid that the previous owner had fitted below
the tank, with exposed terminals, horrible wiring, and all tied
up with an inner tube and tape... Also want to fit a fuse
between battery and the main power lead, as of course there is
no protection at all, and a short could lead to a fire. Does
anyone know the maximum current drawn by the Dynastart? I read
somewhere that they may be rated at 900W, so the maximum current
would be about 75A?
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