OzVMX Forum
Marque Remarks => Yamaha => Topic started by: Andrew L on July 31, 2012, 04:56:46 pm
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I have another follow on question can a 78 it250 be ridden in the pre 78 class as its the same as the 77 model hope I have better luck with this question
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Any body
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mate, if you turned up at the nats, placed 1st 2nd or 3rd, and if it's got 1978 stamped on the frame, then I reckon you've got buckley's unless it's specifically mentioned in 'the book' as a follow on model.
If however, you turned up at a regular club meet with it and ran it in pre78, I can guarantee no-one would give a rats left nut.
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Just want to do local club stuff vmx/vinduros without having a shed full of bikes to maintain so thats what I like to hear dont think 1,2,3rd are going to be a problem either
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So why not ride it in EVO ;) then theres no doubt :)
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What they said
But there does seem to be a legit claim as a flow on as all the major parts, eg, frame, hubs, forks, crankcase, cylinder etc all share the same part No’s as the 77
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Yeah, the IT250E definitely fits into the Pre 78 class (with the D) better than evo..
Was the D a 6 speed also? or just the E?
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Dont have evo class around here yet only pre 78, 75 etc thats why, would if I could.
Its a 5 spd
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Dont have evo class here only pre 78 thats why would if could.
Ok fair enough :) wheres here ?
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Geelong
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Assuming you're correct in saying that the D and E are identical:
Enter it as a D model. If anyone kicks up a stink, say "yep, it's a 1977 model with a '78 frame" over and over again.
Eventually they'll work out that they're objecting to some numbers stamped into the frame and nothing more.
If they keep pushing the point, then point out that the frame is a carry-over part, and produce the copies you've got of parts lists and or brochures...
The problem should go away quite quickly then.
If you're really paranoid, the obvious answer is to tamper with your frame number... ::)
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According to my book the "E" has a 6 speed box not a "5" , :'( Iain
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It is a wide ratio box and so there would be no advantage over the YZ250D five speed close ratio.
Gear clusters are interchangeable as a set with another family member and with the DT250D/E and DT400D/E including the 6 speed IT250E.
Any pair of pinion and wheel gears from these 5 speed gearboxes can be used in a 5 speed gearbox of another family member.
1st pinion gear is on the main shaft (clutch).
Ratios are as follows:
1st 2nd 3rd 4th 5th 6th 1st 2nd 3rd 4th 5th 6th
YZ250D 15/31 18/28 21/26 23/23 28/24 0.484 0.643 0.808 1.000 1.167
YZ400D/E IT250D 14/32 17/29 20/26 23/23 25/21 0.437 0.586 0.769 1.000 1.190
IT400D/E 13/33 17/29 20/26 23/23 26/20 0.394 0.586 0.769 1.000 1.300
DT250D/E/F 13/33 19/34 20/26 23/23 26/20 0.394 0.559 0.769 1.000 1.300
DT400D 14/38 19/34 20/26 23/23 25/21 0.368 0.559 0.769 1.000 1.190
DT400E 14/38 19/34 20/26 23/23 26/20 0.368 0.559 0.769 1.000 1.300
IT250E 14/38 15/31 20/32 23/29 20/21 24/22 0.368 0.484 0.625 0.793 0.952 1.090
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How many gears does the D have?
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Five
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Thanks boddy, I didn't fully read your previous post.
If the D is a 5 speed and the E a 6 so it's not a follow on model
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Its a 5 spd
Hmmmm, if it's a 5 speed, then it must be a D model, not an E model then.... Or maybe a D model motor in an E model frame? Is it matching numbers?
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Havent bought the bike yet only have seen pictures of it, was told it was a 5spd but who no's untill seen, if it was able to be ridden pre78 could have been a possibilty but its not looking likly will still go and look at it anyway. Thanks for all of your input very helpfull
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When it comes to IT250 D & E models they where identical. 5 speed for both and generally all the same apart from engine and chassis numbers.
To club race it, it would certainly eligable to ride and I'd challenge any one to pick the difference (apart from stickers???).
The YZ250D and the YZ250E are two completely different engines in two mildly different frame. The IT's and YZ"D" share the same cases and barrell. The YZ250"E" engine is nothing like the "D".
Ride in the pre 78 club races and enjoy! When you start passing other riders you'll enjoy it more.......
Peter B
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Now I'm confused.
the parts listings on yamaha-motor.com show both the IT250D & E as 6-speeds?!
http://www.yamaha-motor.com/partviewer/default.aspx?ls=sport#/Yamaha/IT250E_-_1978/TRANSMISSION/IT250E_%281978_MOTORCYCLE%29/TRANSMISSION_%28IT250E_-_1978%29
http://www.yamaha-motor.com/partviewer/?ls=sport#/Yamaha/IT250D_-_1977/TRANSMISSION/IT250D_%281977_MOTORCYCLE%29/TRANSMISSION_%28IT250D_-_1977%29
Yamaha Dirtbikes says D = 5-speed, E = 6-speed.
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the it250 d is a 5 speed ,it is the same gearbox as used in yz400 d and e. the 5 speed was not the ideal ratios for trail so they improved it in 78 it250 e by using a 6 speed with more useable ratios
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Now I feel like a goose. I was sure that the 250D and E where both 5 speeds but now I just checked my old parts book the E is a 6 speed. Everything else is the same including the cases. Now that is a strange one.
Nothing will ever surprise me again.
Peter B
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Dont feel bad I asked the question and i'm confused
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Hi I'm restoring an IT250D (cheapskates YZ250D ;D) to ride pre78 with classic scamble club here in victoria. The main differences from the YZ is the shorter suspension travel, minor changes to porting and of course the gearbox ratios, none of which will change your enjoyment of racing at club level. Go for it mavman!
Evo
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Bought an rt3 360 so the IT will have to wait a bit longer (until the wife forgets about the rt) then ill be on the hunt again. Thanks for all the advice from everyone.
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welcom to DT / RT tragics . Iain
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Thanks for the welcome the questions might get more curly from here (if possible).
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If they are about DTs and RTs there are quite a few of us on here .
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Havent got it yet will arrive Thursday week very original bike expect plenty of questions after that.
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Is it home ? where are the pic's Mav . Iain lol
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It arrives next thursday from newcastle cant wait pictures will be put up as soon as she,s here.