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Re: [turbobike] Nitrous Problems - warning, long post

Jeff Churchill (jcperformance@juno.com)
Fri, 16 Apr 1999 10:31:16 edt

    The juice is working,....but the motor's not breathing,.....115 RWHP 
 for  a 1216 cc with headwork is dismal,......I get that on legal  
'Legend'   cars ( same motor with a big driveshaft and rearend, no
porting allowed)    Sounds like the cylinder head is stock.

Jeff Churchill

J.C. Performance    617-06  Bicycle Path   Port Jefferson Station   NY  
11776    USA
tech:  516-928-6679  or  516-928-9863
website:     http://www.jcperformance.com/

On Thu, 15 Apr 1999 16:06:22 -0400 Jon Jarosz <jjarosz@camhydro.com>
>I know this is strictly a turbo list, but I can't get any help on my 
>list because no one else is using nitrous, so I'm sorry if it doesn't 
>apply.  Here's the history of the bike:
>Year 1:
>Stock 1988 Yamaha FJ1200, 1188cc's
>K&N filters
>Dynojet stage III kit (I can't remember needle & jet sizes, but it was 
>the kit recommended)
>Accel coils
>Vance & Hines Supersport Kit, Quitech II baffle
>Factory ignition advancer
>Bike dyno'd 113 horsepower to the rear wheel, 13, 000 km's on motor, 
>18 degrees Celsius outside
>Year 2:
>Same as above, but with nitrous kit, phase II jets bike dyno's 150 
>horsepower exactly to the rear wheel, approx 30,000 km's on the bike, 
>similar dyno conditions, different dyno - ignition advancer removed 
>Year 3:
>My darkest hour.  Bent valves, scorched pistons, burnt seals, blown 
>at dyno shootout (103 to the rear wheel, 148 with the NOS, phase III 
>jets = 
>approx 50 horse rating), twisted swingarm, chain lets go drag racing 
> mess etc
>Year 4:
>"streetfighter" polish & port
>degreed cams/slotted sprockets
>stainless valves, complete head rebuild - new seats, seals, guides, 
>bike bored to 1219cc's, new Wiseco's
>Dyna coils & Taylor leads
>Supertrapp Stealth stainless exhaust (I know I know but it was the 
>complete stainless system for the bike) 14 plates - dyno'd to remove 
>spot with V&H pipe - 6 hp gain across midrange
>phase IV nitrous jets - on paper, 68 bhp gain
>heavy-duty billet clutch, new chain & sprockets, clutch spring 
>115 to the rear without the juice, 154 with, 80 pounds torque no 
>sauce, 100 
>pounds with
>I have stock carbs, and they're synched yearly.  New plugs gapped 
>correctly, etc.  The bike runs like a dream.  43,000 km's on the bike, 
>km's on rebuilt top end.
>Is this motor maxed-out for what I've done to it?  Why is it staying 
>around the 150 mark?
>This fall I'm going to either turbo or blower it, but I'm pissed off 
>these results for this year.
>Thanks for the help.
>Jonny Nitrous