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Discussion Starter · #1 ·
hey guys whats up, i was wondering i have a yoshimure slip on on my 400ex and i made it into a shorty, but anyways what do you think of a fmf megabomb header with the yoshi shorty?
 

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Should make good power.
 

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Agreed, it should definitely wake her up!!!
 

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Agree with Red^^^^ You can get them for about 2.95 at rocky mountain ATV You want the Hex Style Keihin for the main jets
 

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I actually just worked on a Mikuni Carb the other day and instead of using a 6mm deep socket to remove the jet, you just use a small flat head screw driver...
 

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Discussion Starter · #8 ·
sweet thanks, and now i have a problem. well this past thursday i saw that one of the header studs was loose and i went to tighten it and it snapped cause it was cross threaded. now i have been trying to remove the broken stud that is stuck inside the block. i removed the header, and first tried the old vise grip trick but no luck, then second i tried an easy out but with my luck the extractor part snaped off nice and flush with the end of the bolt, and after that i tried drilling the stud but the extractor is eating up all of my metal drill bits, and after all of that i tried a tightning bolt extractor , first i tap and died the small bolt and screwed the extractor on, then put the outer part on and tightened that which now that cant get tight enough or whatever too screw it out. WELL what do i do now, try and drill the old bolt out and then tap the new hole? should i remove the motor to make it easier to fit a big drill their? i need some ideas guys lol thanks.


and what kind of oil do you guys run in your 400ex's ? / filter/ plug/wire thanks
 

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I use GN4. You can get it at Honda parts stores. I also get my filter there.
The manual calls for an NGK plug. Off the top of my head I do not know the size.
Someone will probly be along sortly to tell you the size. Never replaced the wire. I am a OEM guy and would go to Honda and pay to much for that aswell.
As far as your head bolt issue. I did this on the head of and old chevy 350 once and had to take the head off and put it on a drill press. That harded steel easy out is a B---h to drill out but if you do it slow and with plenty of lube you should be fine.The reason why I used a drill press was because you can keep the part square with the bit easier to eep the bit out of the threads.
 

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Discussion Starter · #10 ·
thanks for the help and ideas man ill be calling out of work once again tomorrow for-sure to get it done lol, and i was wondering i may be interested in the pro circuit header with my yoshi shorty , any of you have the t-4 header? how is it?
 

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Spark plug is as follows:

Standard -- DPR8Z(NGK)

For extended high speed riding -- DPR9Z(NGK)
 

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On that head stud if you havent drilled to deep of a hole in it you could dremal out a notch in it and try a flat tip screw driver. I have used one of those angled flat tips and a braker bar and it worked well. Like i said dunno how big of a hole you drilled tho.
 

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Right on glad i could help. I didnt know how close to the head you broke it off so i was hoping i got to you before you tore it apart.
 

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