Thank you all for the answers on this topic over the years
To summarize:
De-restricting Yamaha xs400 DOHC
1. Intake Boots marked 20KW on the edge replaced with Boots marked with 12R.
2. Jets changed to: #127.5 on the left, and #117.5 on the right for your mains, #35 for your starter.
3. CDI/TDI unit: from TID12-08 12F-10 to TID12-07 12R-10 (red plate)
4. Camshaft - Restricted cams are marked "F"
Everything marked with F (cams, ignition 12F-10, carburetor joints) is from restricted model.
Restricted intake:
Restricted cams are marked "F"
And 45HP cams has 2mm higher lift (left 45HP, right 33HP)
CDI/TDI:
Restricted CDI/TDI:
Possibly only difference is this resistor:
To summarize:
De-restricting Yamaha xs400 DOHC
1. Intake Boots marked 20KW on the edge replaced with Boots marked with 12R.
2. Jets changed to: #127.5 on the left, and #117.5 on the right for your mains, #35 for your starter.
3. CDI/TDI unit: from TID12-08 12F-10 to TID12-07 12R-10 (red plate)
4. Camshaft - Restricted cams are marked "F"
Everything marked with F (cams, ignition 12F-10, carburetor joints) is from restricted model.
Restricted intake:
Restricted cams are marked "F"
And 45HP cams has 2mm higher lift (left 45HP, right 33HP)
CDI/TDI:
Restricted CDI/TDI:
Possibly only difference is this resistor:
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