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Members: Introduce yourself / New old member
« Last post by Joe on August 15, 2023, 06:55:58 AM »
Back in the early 1970s I owned a’67 175 DT. It was my first street bike and now fifty years and dozens of bikes later I got the itch to ride another. I bought one last January to be mechanically restored after I get it registered. Still waiting on the status of getting a bonded title but hopefully it should go through. Realizing it might be several years before it’s ready to ride I bought an HS .
I started to work on old Japanese bikes six years ago when I retired but they were mostly twins and all were four strokes. I heavily relied on YouTube videos and one of the first things I noticed was the lack of videos on Bridgestones. Well I never feared backlash from asking stupid questions so stand By !
Members: Introduce yourself / Re: New member/ Bridgestone owner 90cc sportx2
« Last post by sal748 on August 06, 2023, 05:12:06 PM »
Members: Introduce yourself / New member/ Bridgestone owner 90cc sportx2
« Last post by Rancar90 on August 02, 2023, 03:04:40 AM »
thanks for having me. I appreciate the great information. not exactly easy finding info on the motorcycles. thanks in advance.
Members: Introduce yourself / New Bridgestone Owner
« Last post by sal748 on July 30, 2023, 04:24:29 PM »
Hi everyone!

Recently wanted to get my hands dirty with a motorcycle restoration project, so I picked up a Bridgestone 175 (and a Honda Superhawk). Been tearing it down and taking inventory on what parts are missing and need replacement. Came across this website and have already picked up a lot of tips, so thank you everyone for your posts. Currently working on re-doing the wiring, and waiting to hear if replacement parts are available.

Glad to be a part of the community! Pic attached of the Bridgestone and Honda
175 & 200 Talk / Re: silicon replacement of original rectifier on 200RS
« Last post by johnrkeele on July 25, 2023, 02:32:58 PM »
At the AMA Vintage Motorcycle Days meet last weekend I was able to fine exhaust header gaskets that I think I have
successfully modified to fit. They are for Yamaha YL1, and also Yamaha YG5 appears to use same the same gasket
John K.
175 & 200 Talk / Re: silicon replacement of original rectifier on 200RS
« Last post by johnrkeele on July 17, 2023, 03:39:07 PM »
Onward with the Dec 1969 build Mk2...real enjoyable to ride...noticing the 'tall-ish' gearing with the 16-36 sprocket combination, which
I calculate to 11.5 mph/1000 engine rpm (with tape measured 79" tire circumference). In comparison, the 1971 Yamaha 200cc CS3 that
 I have, which with its standard sprockets, calculates to 9.4 mph/1000 engine rpm. So the Mk2 is geared 22% taller than the same
displacement Yamaha. I also definitely notice the taller first gear on the Mk2...gear 'range' on the Mk2 is 3.02 (first gear
ratio divided by top gear ratio), where it's 3.37 on the CS3.

Two things I need to accomplish on the Mk2...I'd like to find replacement exhaust header gaskets (1142-5000), and haven't found any
as yet.  Also, there is a seepage from the oil sight glass that's enough to make a drip from the bottom of the oil reservoir.  At first, I
assumed it was the oil tank outlet connection leaking, but then noticed the oil on the tank below the sight glass.
Has anybody had this problem and fixed it with some kind of a 'sealer' application to the existing unit? (I think I saw the high priced
new sight glass from Richard suggests sealing the new unit with 'permtex #2'.)

John K.
SR Racer Talk / Re: Tach interchange
« Last post by OldSwartout on July 11, 2023, 06:13:37 PM »
The 175/200 engines don't have a mechanical tach drive like the 350.  You'll need an electronic tach.
SR Racer Talk / Tach interchange
« Last post by 68SR on July 10, 2023, 11:28:39 AM »

 Is the 350 tach the same as 200/175 ?
175 & 200 Talk / Re: silicon replacement of original rectifier on 200RS
« Last post by czmike on July 05, 2023, 05:55:25 PM »

Whoopeee! Well done John!!

Thanks for letting us know how you did.
It's nice to share the joy of riding these things when they are running sweet.

Insulation failure in ignition primary circuits is often overlooked.
I use an insulation tester to check primary circuits and it tests at 500 volts DC.
This meter shows up bad ("leaky") condensers as well as other insulation failures (like "kill" switches in bikes with magnetos).
A multimeter tests at only a couple of volts so they won't show up insulation faults that only occur
when high voltage is applied.
Careful observation (as in your case) will usually find suspect insulation without having to resort to an expensive tester.
Knowing where to look though is handy (visualisation is super important during any electrical diagnosis - as you can't see electricity!).
The ignition condensers in your 200 are rated at 250 Volts D.C. Working (250VW) and all the wiring and terminals
in the primary circuit have this sort of voltage applied to them. Along with peaks of short duration up to 300 volts.
So it is important that all the insulation is in good condition.
So the dribbly coil lives on.

Enjoy riding it John!

Best Regards,
175 & 200 Talk / Re: silicon replacement of original rectifier on 200RS
« Last post by johnrkeele on July 05, 2023, 11:58:35 AM »
I'm happy to report that the Mk2 ran just fine as I rode it down the road yesterday evening (~2.5 miles round trip). One of the
insulation disks (it was the one that happened to be in the 'outer' location under the spring) on the right cylinder points set connection
had a visible crack. And Mike, it was a revelation to me that the voltage in that area is a lot higher than 12v!

(There was also another thing that was adding to my confusion on trying to analyze the problem...I finally figured out that
my fuel hook-up for the stationary testing was not working consistently, and sometimes depriving one or the other of the carbs
with fuel flow. And it was apparently happening to be on the cylinder that was being suspected/tested on the ignition problem...
which explains the cylinder going dead with further running, and attributing it to be part of the ignition problem.  A bit of DUH! here.)

Thanks for the valuable inputs.

John K.
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