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Yes. The difference is the oil hole.

http://www.ebay.de/itm/Yamaha-XS400-XS-400-OHC-2A2-Kolbenringe-Piston-rings-4-Ubermas-1-00-mm-/252122272834?hash=item3ab3a89442:g:hdsAAOSwA4dWG7HW

The data are provided in the attached files.

different part numbers: 1TX-11631-00-A0 for FJ1200 4PU-11631-00-A0 for XJR1200 but i dont know what the differences are, because the XJR pistons can be used in the FJ.

XJR1300 rods and XJR1200 pistons (77mm) The GS500E liners were modified as shown in the attached image.

I use modified GS500E liners for 488ccm.

Yes, that's right.

http://www.scheuerlein-motorentechnik.de/motorenersatzteile/motorrad/Yamaha/400-499-ccm-y4/-0-360/

Look here: http://forum.xs400.net/phpBB3/viewtopic.php?f=9&t=587 This is in german and I can not translate but maybe it will help you.

No problem, you have got the job. :D My english is not good enough to do it, sorry. :shrug:

Here is my self build eletronic ignition for use with contact breaker. http://xs400.net/wb/pages/technik-faq/zuendung-elektrik/bauanleitung-zur-kontaktgesteuerten-transistorzuendung-von-stone.php

I can't explain in english, but the pictures may be helpful.

Yes. All XS400 coils work for points ignition. XS400 DOHC coils will work too.

It costs too much acceleration and i will not lose any acceleration. :shrug: I think for real speed you need other bikes... These ones: http://www.youtube.com/watch?annotation_id=channel%3A7490d996-5813-2513-8d41-e0cb4e8875bf&feature=iv&src_vid=Ph0SjLC_lqk&v=LU-ynRoqDEs :thumbsup:

Anything is possible. Do it. :) Sprockets are 16/37.

The fairing is very effective. :D

The piston crown looks a little bit funny but it was necessary to reach 10.8:1 compression. Therefore i could remove material from the cylinder head to improve the airflow near the intake valve. (Sorry i didn´t made photos.) Original Carbs. Not testet, no idea. 115mph at 10500 rpm :bike:

XJR1300 rod Yamaha Part Number: 5EA-11650-00 http://www.boats.net/parts/detail/yamaha/Y-5EA-11650-00-00.html

The piston crown is modified. The photos show the piston before and after modification.

I use Yamaha XJR1300 rods and modified Kawasaki GPZ900R pistons (diameter 72.5mm). The stock sleeve allow max. 73mm pistons. You can also use FJ1100/FJ1200 rods, but the better way are XJR1300 rods which are lighter and stronger.