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  #11  
Old 1 Week Ago
JET-33 JET-33 is offline
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Originally Posted by Nutty View Post
You won't find a shop mechanic that can properly tune a FCR. The mod you speak of is the 'PK' mod and it controls the AC pump stroke depth, not the throttle valve. The PK mod is only done on slant FCRs, your FCR-MX doesn't have the casting to take the PK mod.



There's about $250 worth of labour in tuning a FCR, it'll need a 'Merge' spring, the 'O'ring mod, the AC pump feed orifice drilled out, a Boyesen Quickshot ( or preferably a rare-as R&D PowerPump, the PowerBowl doesn't work), 2007 YZF250 jetting spec. the TPS re-set to 0.75V, the MAJ set to 1.1x the YZF MJ and lastly, the PAJ set to 2x the PJ.



There's probably under a dozen blokes in the country that truly know FCRs and most of them are retired grumpy old farts now that CBF'd.


Thanks for the detailed response.

Any words of advice for the things that are simple, effective and worthwhile doing in that case?



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  #12  
Old 1 Week Ago
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Pygmygod Pygmygod is offline
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Clean it.
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  #13  
Old 1 Week Ago
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Quote:
Originally Posted by JET-33
Any words of advice for the things that are simple, effective and worthwhile doing in that case?
The adjustable LJ is an imperative. It takes a good mechanic 50 minutes to swap out a LJ.

There's 13 settings on a FCR, all need to be spot-on to make a 5V Yamaha run great.

A stock 5V WR250F will make 40HP with bolt-ons and the stock cams degreed in.
They were a hell of a motor.
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  #14  
Old 1 Week Ago
JET-33 JET-33 is offline
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Originally Posted by Nutty View Post
The adjustable LJ is an imperative. It takes a good mechanic 50 minutes to swap out a LJ.



There's 13 settings on a FCR, all need to be spot-on to make a 5V Yamaha run great.



A stock 5V WR250F will make 40HP with bolt-ons and the stock cams degreed in.

They were a hell of a motor.


Good mechanics in Victoria?


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  #15  
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Keg Keg is offline
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Take it to TJ at EZE race products in Gisbourne. He is a smart dirt bike guy that will get it going.


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  #16  
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Good mechanics in Victoria?
Ciscos Race Tuning would be my choice.
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  #17  
Old 1 Week Ago
DaoRadivo DaoRadivo is online now
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Ciscos Race Tuning would be my choice.
+1, Steve is an operator.
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  #18  
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JET-33 JET-33 is offline
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is the grey wire mod and baffle out worth doing, or better off just getting the carby cleaned and setup right?
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  #19  
Old 6 Days Ago
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is the grey wire mod and baffle out worth doing, or better off just getting the carby cleaned and setup right?
They're worth doing for sure...but, both those things alter the jetting requirement. Doing those mods without dialling in the jetting will make the bike run worse.

5V motors are hard to jet and the FCR is a complicated sucker, two reasons they went to 4V and FI...
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