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TOPIC: GFrench- Turning IT 400 into MX 400

GFrench- Turning IT 400 into MX 400 21 Jul 2018 19:37 #1

  • GFrench
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So I had picked up a 1976 IT400 some time ago and really had no plans or good idea on what I wanted to do to this bike... So has sat in the corner of the shop for some time.





Hmmm... Restore it back to original or maybe along the line of one of my favorite Yamaha MX models... the 1975 MX 400!

With many of the same parts and style- thinking the 76 IT 400 transformation to a 1975 MX 400 is very achievable and will be fun to see it take on a brand new appearance!

Tell me how cool this bike is! So here is the vision of my completed project here....













So get your popcorn ready and join me on this path... This finished bike will make its riding debut at Cali Dream'in 2019!

The teardown started today so updates and more pics on the way very soon!
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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

GFrench- Turning IT 400 into MX 400 22 Jul 2018 07:08 #2

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Time to start the tear down....



I had started this bike up a few months ago and other then some serious piston slap... the bike came back to life pretty easily. Shifts thru all the gears perfectly so tearing down with some good confidence that the engine is solid and with a new bore and piston will be ready to go.




Pretty amazing as many of the nuts and bolts have never been touched on this bike.













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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

Last Edit: by GFrench.

GFrench- Turning IT 400 into MX 400 22 Jul 2018 07:10 #3

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About an hour later of disassembling... here is where the project is.

Now time for a little power washing to start prepping the frame and swing arm for new paint.

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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

Last Edit: by GFrench.

GFrench- Turning IT 400 into MX 400 22 Jul 2018 19:23 #4

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Made some nice progress yesterday and a few hours today on this project.

Everything is disassembled with first round of cleaning and scrubbing done!

Frame and swing arm has been power washed and will do a final once over to be ready to start the prep work for some fresh gloss black paint. Once painted will be installing all new bearings in the swing arm and will be ready to bolt back up.



Engine was not to bad... a little WD-40 to soak and start the wipe down.



Looking much better!



Will be using this product (PJ1- Satin Black) to paint the cases... I hear this stuff is the real deal and by the looks it puts the perfect satin finish on the cases.




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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

Last Edit: by GFrench.

GFrench- Turning IT 400 into MX 400 22 Jul 2018 19:43 #5

  • GFrench
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Pulled the Flywheel and Stator-

Other then a couple corroded screw head.... excellent shape! and again appears this was never removed from bike prior... Amazing!










Will be replacing both Main Seals now that I am this far along.



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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

Last Edit: by GFrench.

GFrench- Turning IT 400 into MX 400 22 Jul 2018 20:43 #6

  • mdscott
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very nice, :Throttle
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Thanks Mark
Roseville, Ca.

'76 Bultaco 143 Frontera
07 DL650
74 DT360
75 Norton
73 CB500K
63 C200
87 PW50
64 McClane Edger

GFrench- Turning IT 400 into MX 400 23 Jul 2018 19:43 #7

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Packed up the Cylinder and Piston and on the way to Mr. Enduronut for his expertise...

New Bore- Piston- Rings is my guess. Everything looks great just had some serious piston slap noise when I started it up a while back.







Most all parts are now ordered- Tires- Plastics- Tank etc... will come together fast!
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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

GFrench- Turning IT 400 into MX 400 23 Jul 2018 23:45 #8

  • Hammer
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Greg,

Can't wait to see and hear her at CA Dreamin" 2019!

Hammer

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"Who, More than Self, His Country Loved."

GFrench- Turning IT 400 into MX 400 24 Jul 2018 06:42 #9

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Hammer wrote: Greg,

Can't wait to see and hear her at CA Dreamin" 2019!

Hammer


Thanks Buddy- Already looking forward to Cali Dream'in 2019... this will the 6th year coming up- Amazing!

Bike will be completed and dialed in for some desert and Hungry Valley riding!

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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

GFrench- Turning IT 400 into MX 400 24 Jul 2018 07:08 #10

  • GFrench
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Parts list is getting shorter!

Found a tank that is in decent shape- Tank will be stripped- prepped- epoxy primer and a little Krylon rattle can white - new decals and 2K clearcoat!

Will turn out great!







MX400 Plastics on the way- along with a new set of Pirelli Scorpion MX eXTra -X- Soft To Mid Terrain!






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If it ain't smokin', it's broken!
1970 RT1 360
1970 RT1 360
1971 CT1 175
1971 DT1 250
1971 DT1 250
1971 RT1 360
1971 RT1 360 "Black Widow"
1974 DT 360
1976 IT 400
1978 XT 500
1980 YZ 465
1984 IT 490

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