1971 Interstate Fastback restoration

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Hello,
on my way home tonight, my speedo started spazzing out. and it wont go past 30 m.p.h....even though i was going 70. The speedo has been rebuilt. Cable? drive? or speedo? Is this a familiar failure to anybody

thanks in advance
 
motoalchemist said:
Hello,
on my way home tonight, my speedo started spazzing out. and it wont go past 30 m.p.h....even though i was going 70. The speedo has been rebuilt. Cable? drive? or speedo? Is this a familiar failure to anybody

thanks in advance

Sounds like the drive unit pack it in. Its a worm drive, and pot metal. They'll wear down pretty fast when dry. Much more stress on this than the gauge, because its down where it can get hot and wet, and that drive has to twist a nearly 5' cable.
 
BillT said:
motoalchemist said:
Hello,
on my way home tonight, my speedo started spazzing out. and it wont go past 30 m.p.h....even though i was going 70. The speedo has been rebuilt. Cable? drive? or speedo? Is this a familiar failure to anybody

thanks in advance

Sounds like the drive unit pack it in. Its a worm drive, and pot metal. They'll wear down pretty fast when dry. Much more stress on this than the gauge, because its down where it can get hot and wet, and that drive has to twist a nearly 5' cable.

Bingo, thats exactly what it was, bought a new drive unit and installed, everything fine now

1971 Interstate Fastback restoration
 
Thats an interesting project you have there mate , reminds me of my build back in 94 when i monoshocked my 850 ,certainly keeps the brain ticking over working out the way round problems which makes it so interesting .

Keep the pics and info coming , i love to see new ideas on an old subject and the skills that overcome the setbacks 8)

Looks like i posted this on the wrong thread , i was refering to the Monoshock single sider :oops:
 
1971 Interstate Fastback restoration


Hello all, its been awhile. I was thinking about changing the name of this thread because this commando is no longer a restoration, but a proper daily commuter. I have had a few issues that have come up that I wanted to share as I have managed to fix all of the bugs.

1. Would not idle nicely-- what this came down to is my Amals were old. I installed some brand new delux Amals (purchased from the webmaster) and that immediatly took care of the problem. The only thing i had to mess with is installing a #19 air jet, they came with 17s installed.

2. Bike started up fine and ran OK, but after 20 minutes or riding I would get an occasional sputter, sometimes as the ride went on it got worse and worse. -- This was a doozy, it was driving me crazy, I thought I had battery drain problems, air leak in head, wires touching and shorting, bad coils ( I replaced them with new). It was definitly associated with the temperature of the engine. after MANY hours of trouble shooting and getting stranded once or twice I discovered the issue. I run Boyer ignition, and as with many owners, the wires at the pick ups come loose....mine already did that a few years ago and were proper repaired. After going to the boyer website, I noticed they gave a specific resistance to the little pickup coils ( 66 ohms) and if they were not both the same resistance, cold, then there was a fault with the pick up assembly. Because as the engine warmed , the fault was augmented, thus my engine was missfiring.....bought a new pick up and VIOLA, the bike ran like new.

3. battery kept dying -- two problems, disintegrated stator wire connectors under carbs from oil, and alternator rotor had almost no magnetics. Replaced rotor,stator and new wire connectors....headlight has never been so bright, puts out 14v+ at speed.
 
1971 Interstate Fastback restoration


The bike is an absolute joy to ride and blends in nicely with my daily routine. In this picture you can see the Halcyon mirrors I recently installed, worth every penny. and my small minature brake resivour, cleaned op the bars real nice.

I had one other issue that I really need to share. My clutch holder nut kept backing off, and clutch falling off layshaft!!
I thought the first time I forgot to tourqe the nut, or forgot to bend the tabs on the tab washer...but when i took the primary cover off the tabs were bend, but the nut had broken them off from backing out! I redid everything hoping that was just a tourqe issue ( that nit is 70 ft lbs i think) But nope, after about 150 miles you could feel the clutch adjment going bad and eventually no clutch at all. (went through this a couple of times) -- the problem ended up being wear in the splines of the clutch hub and transmission layshaft. there should be barely any movement between those two parts. i bought a new layshaft and clutch hub from RGM (best prices ) I noticed the new clutch hub come better heat treated. Layshaft was easily replaced without taking gearbox out of bike, just inner and outer covers, and the dam thing just slides out (well after removing clutch anyway) drive sprocket did not need to be removed either.
Now, after 1000 plus miles with those new parts and new surflex clutch discs, my clutch works better than new
 
BTW, the rearsets you see in my Commando are a set from madass140. Ive had them for nearly 2 years now and have been very very happy with them. at 6'2" they have allowed me to fit comfortably on bike.
i did have a oops the other day. i got to low and to close to the corner of a sidewalk taking a right turn...bent the footpeg back. I was doing 30-35 mph and it could have easily tossed the bike to the ground. madass140 has replacement parts available and they are on the way...great product support! thanks

1971 Interstate Fastback restoration
 
I mounted my foot pegs rotated so they fold up and back at 45 deg to avoid just that.works a treat.

lovely bike!
 
YeeHaw could of ruined a weekend or more if toes/ankle snagged as well. Anywho wonderful craftsmanship to see and cringe if in my care.
 
today i installed this new master cyclinder by "shindey" products. Its a contained unit with a 1/2" plunger, built in brake light switch and the best part is the resivour is round and the whole thing is made with a 15 degree droop for low bars

http://www.shindypro.com/retro_mckits.html

1971 Interstate Fastback restoration


1971 Interstate Fastback restoration


1971 Interstate Fastback restoration



Of course I have no turn signals and I only have a kill switch on right bar. This unit is replacing the 5/8' nissin unit I was running before. great stopping power but with much less effort. as in two finger stopping.
 
Update on the master cylinder from Shindy.

Works fabulous. nice easy two finger pull with predictable stopping. Much more powerful than the original Norton unit (obviously) So if you are not concerned with the Lucas switch controller (remember I have not turn signals) this would be a great option to resleeving. The Master cylinder was 175.00 USD ish if I remember.
 
here are a couple of stills, and i forgot to mention i recently acquired a norman hyde fork brace. which ill install soon

<a data-flickr-embed="true" href="" title="20201227_163749_HDR"><img src="https://live.staticflickr.com/65535/50768322573_526176857b_b.jpg" width="768" height="1024" alt="20201227_163749_HDR"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>

<a data-flickr-embed="true" href="" title="20201227_163619"><img src="https://live.staticflickr.com/65535/50768322708_14e1c128be_b.jpg" width="768" height="1024" alt="20201227_163619"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>

<a data-flickr-embed="true" href="" title="20201227_163637"><img src="https://live.staticflickr.com/65535/50768322188_a14f08d7be_b.jpg" width="768" height="1024" alt="20201227_163637"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
 
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