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Post by cdem72 on Jan 2, 2021 18:56:06 GMT
My 1971 twin T'NT uses a single filament 60 W bulb, but I only have a 60/60 W bulb with one broken filament, so I modified the contact so it would work, so far no problems. My question is: on later sleds that used the double filament 60/60 W bulb for hi/lo headlights, did only one filament operate at a time or on high beam were both filaments energized? Thanks to anyone who can share this info.
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Post by Doo640ER on Jan 3, 2021 14:20:22 GMT
Hi Colin, on my 72 Nordic 640 I am 99% sure only one filament is energized at any given time. No matter which beam is activated. I'll check it out today (hopefully I remember to)!
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Post by olyman on Jan 4, 2021 21:39:53 GMT
You are right Mark, there's only enough lighting coil for one element at a time. The 71 era with 60w lights had 70watt coils, and even the later 100watt coils wouldn't be able to handle two beams at the same time.
Colin is that a 640 you are working on?
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Post by cdem72 on Jan 4, 2021 22:23:37 GMT
Yes, I have a 440 as my daily rider, but the 640 has been in slumber for 25 years. Working well now, just a little bog from idle but if I feather the throttle , it gets the revs up pretty quickly. Just posted a video of taking it for a run. www.youtube.com/watch?v=JNRjf94x4zo&t=44s |
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Post by olyman on Jan 4, 2021 22:43:09 GMT
Right on! Good video too! Must be the video sound, but it sounded like it was louder on on cylinder than the other by times. I wonder if thats why you have to feather it? I could be in left field though.
I might have to ask you some questions about that sled sometime. I'm still figuring mine out.
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Post by cdem72 on Jan 5, 2021 17:56:48 GMT
I didn't run a compression test, just changed the plugs and fired it up. It idles pretty well from cold so I don't think it is missing at all or has a bad cylinder as it runs well at any throttle position. I may give the carb a once over in the spring to make sure there isn't any gummy residue inside. It sounds much different than my 440 which I will have out at some point and have other videos of. Just waiting for an engine shroud repair.
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Post by olyman on Jan 7, 2021 0:01:58 GMT
For sure - It sounds good regardless & clearly works well! Ya those 640's definitely don't rev high, but gets good results for the RPM!
Are you running the original clutch? How worn is it - the one that came on mine is pretty chewed where the dogs engage the end of the shaft. And the moving sheave wobbles pretty good on the shaft too. Hence the reason I saved up for a powerbloc but don't really know if its running right or not as I've never ever ran a 640 before. Doesnt help that my tach doesnt work right so I have no idea how high it revs lol.
Looking forward to seeing the 440.
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Post by cdem72 on Jan 7, 2021 18:11:40 GMT
For sure - It sounds good regardless & clearly works well! Ya those 640's definitely don't rev high, but gets good results for the RPM! Are you running the original clutch? How worn is it - the one that came on mine is pretty chewed where the dogs engage the end of the shaft. And the moving sheave wobbles pretty good on the shaft too. Hence the reason I saved up for a powerbloc but don't really know if its running right or not as I've never ever ran a 640 before. Doesnt help that my tach doesnt work right so I have no idea how high it revs lol. Looking forward to seeing the 440. I have NOS Original clutches on my T'NTs, bought up a couple of the orange bells when a dealership was clearing them out. Clutch chatters a bit when idling but functions well enough as a driver. Those tachs are around for decent prices so you should up grade to see what you are turning, should me around 6500 rpm. PS all my other videos of '71 T'Nts are of the 440 from previous years activities. |
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Post by olyman on Jan 8, 2021 19:24:10 GMT
That was a fantastic score IMO. Those old style clutches were crude, but they worked well when in good shape.
And that there is some good info about the RPM. Thank you. I will start looking for a tach.
Where are the 440 videos?
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Post by Doo640ER on Jan 9, 2021 12:49:26 GMT
Yes, I have a 440 as my daily rider, but the 640 has been in slumber for 25 years. Working well now, just a little bog from idle but if I feather the throttle , it gets the revs up pretty quickly. Just posted a video of taking it for a run. www.youtube.com/watch?v=JNRjf94x4zo&t=44sThat is a great video! I didn't realize you were carrying a passenger until I saw the shadow in the sunlight, LOL. I was trying to get a good look at your gauges but not much luck. I was trying to see what sort of top speeds you were hitting? Not that the speedometers on these old beasts are super accurate, but on that topic, what top speeds are people seeing on their 640s? I know gearing plays a big part. When I was riding my Nordic 640 a couple of weeks ago on frozen roads, I was hitting somewhere in the 51-54 mph (82-87 kph) range. Now that was according to the original "dream-o-meter" that I just got working at the end of last year when I replaced my track and speedometer hookup components at the front axle shaft. It sure felt like I was going that fast, LOL but that's not hard on these sleds, eh? So what sort of speeds are others claiming? I plan to use my phone GPS to clock my speed if it ever snows again!! |
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Post by cdem72 on Jan 9, 2021 23:51:44 GMT
Many years ago I took it out in a hardback ditch. Speedo was reading about 72 mph however, everything was bouncing around so hard I had to remember the needle position to see what it read once I stopped. The 640 gearing uses an upper 20 tooth sprocket so it should go faster thant th e440 with 16 tooth. 775 has u 22 upper sprocket, I believe the speedos are at least 5 mph optimistic, so if you read 60 mph, you may only be going 55 mph. I sort of guestimated as I was reading 60 mph and all the traFfic on tHe highway was passing me slowly with a posted speed limit of 100 KPH (62 mph). 40 mph on the speedo seems like a nice safe speed to go considering the back-breaker slider suspension, LOL! For all youtube vids search cdem72, you will get some racing vids of my '70 blizzard, too.
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Post by cdem72 on Jan 10, 2021 0:54:44 GMT
Hi Colin, on my 72 Nordic 640 I am 99% sure only one filament is energized at any given time. No matter which beam is activated. I'll check it out today (hopefully I remember to)! Do you know which filament is the hi beam, the wide or narrow, upper lower? If I would guess, I guess the narrow lower filament, if it would reflect of the curved back housing higher and narrower? |
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Post by Doo640ER on Jan 10, 2021 13:38:37 GMT
Hey Colin, I'll see if I can play around with it a little today and get you some info. I've been needing to work on my high/low beam switch on my Nordic anyway as its not "holding" in both positions. I think I need to squirt a little electronics lubricant inside of it. I've really been wanting to upgrade the front light on my Nordic. Have you done any research on LED bulbs that would make it a lot brighter?
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Post by olyman on Jan 10, 2021 14:03:17 GMT
What I have found before is the thinner filament is the high beam, and thicker the low. I should be able to find out for sure today.
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Post by Doo640ER on Jan 10, 2021 19:33:28 GMT
Here's the bulb on my Nordic which Im using a 6260B I believe and I labeled with the info. I had a good time looking into this, but no pun intended, all I see now are spots! It should confirm what Olyman said. I never actually looked at this in depth. Hope this helps Colin. Attachments:
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