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Author Topic: 1972 Yamaha DS7  (Read 27699 times)

Offline hectus77

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Re: 1972 Yamaha DS7
« Reply #50 on: Jun 07, 2017, 12:51:50 »
Thanks for a nice read, I love two strokes and nothing is better than seeing a good old bike getting a new life.

I dont wanna hijack this thread, but since it seems u guys switch out engines and stuff i gotta ask; I have a hard time getting a engine for my DS7, i got the bike but no engine, was told by the previous owner someone stole the engine outa it. Anyhow I want a true DS7 engine with DS7 stamped on the block, however if the cylinders is 350 or what it doesnt matter as long as i get the ds7 markings. A Running engine would be great, but if its seized or something, its still something i can work with. Does anyone have, or know of one? if so, im seriously intrested.

:)

Offline VonYinzer

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Re: 1972 Yamaha DS7
« Reply #51 on: Jun 07, 2017, 13:14:18 »
Thanks for a nice read, I love two strokes and nothing is better than seeing a good old bike getting a new life.

I dont wanna hijack this thread, but since it seems u guys switch out engines and stuff i gotta ask; I have a hard time getting a engine for my DS7, i got the bike but no engine, was told by the previous owner someone stole the engine outa it. Anyhow I want a true DS7 engine with DS7 stamped on the block, however if the cylinders is 350 or what it doesnt matter as long as i get the ds7 markings. A Running engine would be great, but if its seized or something, its still something i can work with. Does anyone have, or know of one? if so, im seriously intrested.

:)

Can't help ya down low, but I do have an entire DS7 top end with some clutch parts I'd part with.
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline Redbird

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Re: 1972 Yamaha DS7
« Reply #52 on: Feb 25, 2018, 15:34:32 »
Been a while since I've posted in here :o
Not too long after the last update, she saw a step up in jetting and carbs adjusted properly (thanks Neal and Charlie ;)), an RD350 clutch upgrade, and properly set timing (thanks Murray ;)). Then she seemed to have started sucking air from one of the brand new crank seals. Now, I had modified a set of RD350 style seals to work in the DS7 cases. Then, I found out they make actual DS7/R5 replacement seals *facepalm*
Then she sat... for over a year :(
Well, this weekend I got motivated. Especially after noticing this...

The cobwebs aren't easy to see, but if you look real close, you can read where Charlotte weaved in a message saying:
"Hey Asshole! Shouldn't you be riding this thing?!"
Ok, Ok... point taken ;)

Both ends of the crank now have the proper DS7/R5 seals installed. While in there I pulled the injector pump completely and installed the block off plate.


Here she is after evicting Charlotte and a little cleaning to remove the dust layer.


Next I need to clean the tank and carbs of funky fuel, and get her to fire again. Then the task of fine tuning the jetting.
This summer is going to be a lot smokier than last  ;D
When you are Dead, you don't know that you are Dead. It is difficult only for Others.

It is the same when you are Stupid.

Online clem

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Re: 1972 Yamaha DS7
« Reply #53 on: Feb 25, 2018, 21:22:49 »
That's good to see bud. Cobwebs and dust, don't do bikes any good.

Sent from my SAMSUNG-SM-G930A using DO THE TON mobile app

"After every war there are soldiers who refuse to surrender. To this day there are still thousands who cling to their 30+ year old motorcycles, thinking that the war is still on, refusing to concede that the four-strokes have won"

1972 DS7 http://www.dotheton.com/forum/index.php?topic=45886.msg505995#msg505995
1983 CB550sc bobber http://www.dotheton.com/forum/index.php?topic=30599.30

Offline Redbird

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Re: 1972 Yamaha DS7
« Reply #54 on: Feb 26, 2018, 20:04:28 »
Neither does procrastination :P

Well, the tank and carbs are cleaned up. Didn't realize I'm out of two stroke oil though.
I guess she'll awaken tomorrow :)
« Last Edit: Feb 26, 2018, 21:39:24 by Redbird »
When you are Dead, you don't know that you are Dead. It is difficult only for Others.

It is the same when you are Stupid.

Offline canyoncarver

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Re: 1972 Yamaha DS7
« Reply #55 on: Feb 26, 2018, 22:59:51 »
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 73 Norton Commando, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline Redbird

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Re: 1972 Yamaha DS7
« Reply #56 on: Feb 27, 2018, 12:13:27 »
Don't judge me :P
When you are Dead, you don't know that you are Dead. It is difficult only for Others.

It is the same when you are Stupid.

Offline teazer

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Re: 1972 Yamaha DS7
« Reply #57 on: Feb 27, 2018, 13:30:28 »
How can that even be?  Doesn't everyone keep bulk supplies of two stroke oil? From time to time we all run out of something. I just ran out of cash.  Lots of two stroke oil though....

Online Hurco550

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Re: 1972 Yamaha DS7
« Reply #58 on: Feb 27, 2018, 14:43:51 »
How can that even be?  Doesn't everyone keep bulk supplies of two stroke oil? From time to time we all run out of something. I just ran out of cash.  Lots of two stroke oil though....

haha I generally buy it by the gallon, and every time I run out, the price has jumped substantially. It always hurts to have to buy the next gallon.
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Redbird

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Re: 1972 Yamaha DS7
« Reply #59 on: Feb 27, 2018, 20:42:38 »
I SAID DON'T JUDGE ME!! ;D ;D :P

The backstory is... the kid I was paying to cut my grass used up the cheap 2T oil I kept for the string trimmer. And instead of telling me we were out, he spotted the half bottle of Motul I kept for the Yamaha, and used that. The good news is, the string trimmer has never been happier. The bad news is, I was unaware of my 2T shortage.
I know, I know... I ain't no Sheriff Israel... I take full responsibility for the situation. I should've trained the kid better. But I do have one of these on the way.

Hopefully it'll last out the riding season ;)
When you are Dead, you don't know that you are Dead. It is difficult only for Others.

It is the same when you are Stupid.