Vintage Project - Yamaha DS7 - 250
- raYzerman
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Re: Vintage Project - RD250
Ah yes, but to do it right you have to put a Triumph seal in an ES first, then replace with the correct ES seal..... in your case, have the RD seals ready but also a set for the DRZ... we'll get it right eventually.
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Duct tape can't fix stupid, but it can sure muffle the sound.
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Re: Vintage Project - RD250
Black shoe polish on the outside of the tars. That theirs a tip from Burt Munro. How could it be bad advice?!extrememarine wrote: ↑Thu Oct 25, 2018 5:46 pmIf Ray helps me put it back together, the fork seals will get flipped and end up right side up then.
I plan on running these tires - just going to add some gorilla tape to the inside to keep them together about 90...
wheatonFJR wrote: ↑Wed Oct 24, 2018 9:35 pmLooking good, cept mebbe that crack in your front tar...that you were replacing when the other stuff gets done.
I'm not sure, but from here it looks like the fork seals are installed upside down.
extrememarine loved this
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Note: The FJR1300ES offers a significant level of power & performance. It is not intended for novice or inexperienced riders.
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Re: Vintage Project - RD250
Black shoe polish on the outside of the tars.
You are from West Virginia.....?
You are from West Virginia.....?
- extrememarine
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Re: Vintage Project - RD250
Progress update - 2/10/19.
No where to go but up from there...


No where to go but up from there...


CollingsBob and wheatonFJR loved this
Ride There!
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Re: Vintage Project - RD250
I guess you already know this, but this is not an RD it is a YDS7.
Last edited by philharmonic on Thu Feb 14, 2019 8:34 am, edited 1 time in total.
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Re: Vintage Project - RD250
My historical education on this is still in it's infancy. Now I realize why there was some confusion when I said earlier there were not reeds - RD250 in '73 had reeds, the DS7 (250) had piston port induction. This little snipet below says this bike put out 30hp at 7500rpm - holy cow - that's like two complete DR650's!!
The Yamaha DS7 motorcycle was made in 1972 for one year. It was a 250cc twin two-stroke that made 30 hp @ 7,500 rpm. Top speed was 93 mph. 12v battery ignition. five-speed gearbox. 1/4 mile in 14.8 seconds.
The DS7 was the initial forerunner of the Yamaha RD series of motorcycles started in 1973. The major difference between the 250 cc DS7 and 350 cc R5 of 1972 and the 1973 RD250 and RD350 was that the DS7 and R5 utilized piston-port induction, whereas the RDs were introduced with reed valve induction. The 250 was "oil injected" meaning that although the 250 was a 2 stroke or (2 cycle engine) there was no need to premix the gas and oil. The gas tank only contained gas but the oil was injected from an oil tank beneath the seat.
From wiki link:philharmonic wrote: ↑Mon Feb 11, 2019 9:56 amI guess you already know this, but this not an RD it is a YDS7.
The Yamaha DS7 motorcycle was made in 1972 for one year. It was a 250cc twin two-stroke that made 30 hp @ 7,500 rpm. Top speed was 93 mph. 12v battery ignition. five-speed gearbox. 1/4 mile in 14.8 seconds.
The DS7 was the initial forerunner of the Yamaha RD series of motorcycles started in 1973. The major difference between the 250 cc DS7 and 350 cc R5 of 1972 and the 1973 RD250 and RD350 was that the DS7 and R5 utilized piston-port induction, whereas the RDs were introduced with reed valve induction. The 250 was "oil injected" meaning that although the 250 was a 2 stroke or (2 cycle engine) there was no need to premix the gas and oil. The gas tank only contained gas but the oil was injected from an oil tank beneath the seat.
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Re: Vintage Project - Yamaha DS7 - 250
I have a 28 horse Kohler V twin on the shelf. I bet with all the brain power on tech day we could mount it in there.
Now how to couple it with a baker 6 speed.
Now how to couple it with a baker 6 speed.
You ever see a grown man naked Billy?
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Re: Vintage Project - Yamaha DS7 - 250
The fact that the stock motor is advertised with 30hp is nutz - I'll bet that Kohler weights 40lbs more than the 2 stroke!!
Baker 6speed - hmmm....
Baker 6speed - hmmm....
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Re: Vintage Project - Yamaha DS7 - 250
Is that what you call one of those : "Oxy-Morons" ?

Hppants and Bust loved this
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- raYzerman
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Re: Vintage Project - Yamaha DS7 - 250
Dayum.... the Kohler V-Twin in my tractor is only 23 horse...... hmmm, trailer or truck..... hmmmm.
Keep yer stick on the ice........... (Red Green)
Duct tape can't fix stupid, but it can sure muffle the sound.
Duct tape can't fix stupid, but it can sure muffle the sound.