77 - 78 it 250

[Andrew L]

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

[Andrew L]

Any body

[mainline]

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.

[Andrew L]

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

[TM BILL]

So why not ride it in EVO  then theres no doubt 

[GMC]

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

[IT400C]

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?

[Andrew L]

Dont have evo class around here yet only pre 78, 75 etc thats why, would if I could.
Its a 5 spd

[TM BILL]

Dont have evo class here only pre 78 thats why would if could.

Ok fair enough  wheres here ?

[Andrew L]

Geelong

[Nathan S]

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... 

[Iain Cameron]

According to my book the "E" has a 6 speed box not a "5" ,  :'(  Iain

[mboddy]

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

[brent j]

How many gears does the D have?

[mboddy]

Five