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gt96
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« Reply #15 on: June 04, 2012, 02:11:17 PM » |
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Quote from the article:
"A fishtailing problem that we thought was caused by the combination of tire/power band, can be easily solved by extending the trailing arm one inch on a diagonal cut. Refer to the photo for details."
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iainyz
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« Reply #16 on: June 12, 2012, 07:10:55 PM » |
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this is the Freaky s/arm in the Vandy framed , Iain built , Firko and many site members input DT1 pre 70 Yamaha   |
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Yamaha tragic ;at1, dt1, rt1, dt2, rt2, mx250, mx360,sc500,dt125, dt360, tya 250, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 still to finish dt250 75, rt2mx, dt2mx, 3x dt1s; looking for 75 mx 250,400. rides with Tas scramble club
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albrid-3
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« Reply #17 on: June 12, 2012, 08:15:15 PM » |
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I like it, I have the engine, but know frame
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iainyz
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« Reply #18 on: June 12, 2012, 11:18:49 PM » |
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dave the frame is chopped and lowered by 45mm by Vandy . Iain
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Yamaha tragic ;at1, dt1, rt1, dt2, rt2, mx250, mx360,sc500,dt125, dt360, tya 250, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 still to finish dt250 75, rt2mx, dt2mx, 3x dt1s; looking for 75 mx 250,400. rides with Tas scramble club
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OverTheHill
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« Reply #19 on: July 06, 2012, 07:17:12 PM » |
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Wrote a long winded story & sent it to [dunno where!!] so start again.
Not long after the first DT1 arrived at the shop [december "68] something turned up from USA on modifying the square arm which was add an inch & step it 'up' an inch [to rake the front out more] Think there idea was to give it more stability for desert racing. So i did this to mine & the boss's bike. Also we altered the forks [steel slider first model] as per instructions which meant welding up damper holes & drilling smaller ones. Recall that after that we had to run less oil [think 190mls as opposed to 2something] or couldn't get full travel--doesn't make much sense now but anyway. Also [wish i knew where it got to] was an air cleaner box to make [not by me], had a large 'still air area' between filter & carb & used a car type paper element [which was useless in dust but we didn't know any better--till the Filtron green filter came out]. Mod to arm was done at the axle plate, sort of a Z shape plate, [not a Z but straight down & 1 inch wide then contoured top & bottom so it looked right. These days i'd just go back an inch without stepping it up!!. Might start another DT1 story [thinking]. Cheers Morley.
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iainyz
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« Reply #20 on: July 06, 2012, 10:15:31 PM » |
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The mods you mentioned where in Dirt Bike in 73 the story ran over 6 issues . the z plate was used to get the s/arm in a parallel plane to the ground then they used Girling shocks . Iain
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Yamaha tragic ;at1, dt1, rt1, dt2, rt2, mx250, mx360,sc500,dt125, dt360, tya 250, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 still to finish dt250 75, rt2mx, dt2mx, 3x dt1s; looking for 75 mx 250,400. rides with Tas scramble club
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OverTheHill
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« Reply #21 on: July 07, 2012, 09:56:32 AM » |
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"73's a bit late to be thinking of modifying the square arm, [broke mine more than once by then haha] did ours in probably 69/70,maybe "71, might be wrong, december "68 on ownership papers but damn it i scrapped the frame many years ago, so bike as it is--is a bit like an axe with a new head & new handle!! & numbers don't relate. Just sulking looking at your YZb photo, remember getting a couple of A model redundant stock bikes to sell where i worked, think sold for $800 or something after the B model then MX models came out. If only we could turn the clock back. Morley.
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