Tag Archives: bridgestone dt 175

Bridgestone Project: Exhaust and Heads Part II

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So on to the second part of the tear down of the exhaust on the Bridgestone Dual Twin.  I have a couple videos to post, and pls keep in mind that I don’t have a ‘camera crew’ or an film editor (but I have download Adobe’s software to try — at some point– to edit my videos), nope just me and my Android.

So I showed last post how the exhaust was attached.  Not much different than most other motorcycles, except for the rubber pieces that connects the header to the baffle.

You can see the header is a bit rusted but the bolts came off with no problem. The first header I removed was the left side and there was little to no room for a wrench much less be able to get a socket in there.  So it was a bit more clearance if I were to remove the head.  Which I’ve been meaning to do to get a look at the piston and cylinder so I did. Here are the pics and the videos:

This just shows the bolt on the inside (between) the left and right exhaust.

This just shows the bolt on the inside (between) the left and right exhaust.

 

As you can see here's no room go get a socket or even wrench in between the frame and back nut on the header.

As you can see here’s no room go get a socket or even wrench in between the frame and back nut on the header.

So taking the left head off was going to gave me more room.

The heads are on with for nuts on studs in the head.  These looked really rusted but it came off easily.

Here are couple of images:

Nuts and studs are indicated.

Nuts and studs are indicated.

 

Here is the header removed.

Header, nuts and bolts and o-ring.

Header, nuts and bolts and o-ring.

 

Baffle removed

Baffle removed and my foot!! (At least it’s not my thumb!!)

 

Of course I have to include a shot of the pistons and cylinders and you see them in the videos as well.

 

Left Piston and Cylinder

Left Piston and Cylinder

Left Head Chamber

Left Head Chamber

 

Right Piston and Cylinder. See the right head/chamber in the videos)

Right Piston and Cylinder. See the right head/chamber in the videos)

 

Videos show a bit of the exhaust and a few good shots of the piston/chamber/cylinders.

 

 

Thanks for reading.

Tim

 

 

1966 Bridgestone Motorcycle Brochure – DadsCycleMags.com

6-Page Color Brochure that was a magazine insert. Shown in brochure: Bridgestone 175 Dual Twin; 60 Sport; 90 Deluxe; 50 Sport; 90 Trail; 50; 90 Mountain; 90 Sport. 1966 Bridgestone 6-Page Motorcycle Brochure …

Motorcycles – Let’s see em!

Club(s): (PNDC). Here are 2 I brought back from the dead when I was in high school. A 1979 Kawasaki 440 LTD and a 1967 Bridgestone 175 Dual Twin. The 440 sounded great and was a smooth ride. I bought it for $200 and …

The Bridgestone Project – Prequel II

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Since I’ve actually started the disassembly so I’ll make this the last of the Prequels.

A few more details on the mechanic of the bike

Oil Injection – the pump is located next to the left side carb.  The amount of oil that the engine receives is in direct proportion to how much throttle is applied and engine revs.  The oil does mix with the case.

Sport-Shift – Located on the left side of the transmission.  leaving it in the forward position and you can only use the standard 4 speeds.  Move it to the back position engages the overdrive.  The overdrive 5th gear extends the top speed of the Dual-Twin to 80-85 miles per hour.  Normally when you stop a motorcycle you’ll need to shift back down through all the gears.  The rotary shift pattern of the Bridgestone transmission, 1st gear can be engaged directly from 4th gear by just depressing the shift lever forward twice.  This brings you through neutral to 1st gear.  Additionally, it can be started in gear without going back to neutral.

I mentioned Bridgestone’s racing department.  That research paid off as the 90 & 175 racers won the famed Daytona International race in 1966.

There are some more unique features but I think we’ll look at those (as well as the ones already mentioned) when we get to the disassembly.

For now I’ll get started with the restoration of the Dual Twin serial number  16D 07481.

16D 07481

16D 07481

Frame Number  TA1 – 07554 (TA1 indicates a DT 175)

Serial No.  16D07481  (16 indicates DT 175 and the D indicates it was produced in April.

 

Thanks for reading and keep checking back for updates.

Tim

 

bridgestone dt 175

ブリヂストン | 石井進の「もっとランダム」ブログ版 Ver.2

知り合いがネットオークションで（e-Bay）「落札しちゃった！」と言うのがこのブリヂストン１８５. Bridgestone DT-175 『まさか、落札できるとは思わない金額をBidしていた』らしい。 幸かラッキーか！？落札できたのですね。 懐かしいです。今の人 …
ブリヂストン | 石井進の「もっとランダム」ブログ版 Ver.2

知り合いがネットオークションで（e-Bay）「落札しちゃった！」と言うのがこのブリヂストン１８５. Bridgestone DT-175 『まさか、落札できるとは思わない金額をBidしていた』らしい。 幸かラッキーか！？落札できたのですね。 懐かしいです。今の人 …