Author Topic: Yamaha DT1 Pistons  (Read 1830 times)

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Offline DCPlasticsguy

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Yamaha DT1 Pistons
« on: March 13, 2013, 07:57:43 am »
Hey Guys,
I have a 1970 Yamaha DT1 that is bored 1.5mm oversize. I see that the Wiseco 1.50mm and 2.00mm oversize pistons are pretty much dried up. Would there be any interest in having a run of these made? I would have (6) 1.5mm and (6) 2.0mm oversizes available.

I don't want to have them made if I have to sit on them for five years.

Offline firko

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Re: Yamaha DT1 Pistons
« Reply #1 on: March 13, 2013, 10:53:27 am »
I'll play devils advocate.......Don, I've found is that we'd rarely want to take our DT1 cylinder out that far. Because they're reliable old buggers most that I've seen haven't gone past second or third bore, 1mm would be tops. If you find one that is 1.5 or 2mm over and you need to replace a piston, there are plenty of replacement cylinders out there with plenty of bores left. It'd be nice to have the big bore option but I wonder how many folks are 1: building/riding/racing piston port DT1's and 2: how many of those that are, need a piston that big?............Just my 2c worth.
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline DCPlasticsguy

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Re: Yamaha DT1 Pistons
« Reply #2 on: March 13, 2013, 01:32:08 pm »
Thanks Firko. That's pretty much what I was thinking. Just not enough racers out there to warrant the overbores.

Offline Freakshow

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Re: Yamaha DT1 Pistons
« Reply #3 on: March 14, 2013, 04:18:31 pm »
I have some 2mm Rockys if you know any one that needs em and i reckon a box of 2mm rings i have been using cut down :O)
74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline DCPlasticsguy

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Re: Yamaha DT1 Pistons
« Reply #4 on: March 15, 2013, 12:29:07 am »
I could use 1 or 2 kits of the 2mm. What kind of price are we looking at? Or we can trade?

Offline Freakshow

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Re: Yamaha DT1 Pistons
« Reply #5 on: March 19, 2013, 01:26:07 pm »
happy to trade
74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff