Carburetor Set-up & Tuning

Supplying the correct air/fuel ratio over a broad range of flow is the job of any carburetor. It is not nearly as precise as electronic fuel injection,..but surprisingly, NOT less powerful than similar sized throttle bodies. Use fuel injection where possible. Original equipment carburetors are set for stock motors and low emissions, not performance. The goal of any carburetor modification is to improve throttle response, power, and function at all speeds, and accomodate other performance modifications. There are many ways to do this, all of which require an intimate knowledge of the various circuits. We can blueprint, bore, hone, polish, and add additional fuel circuits, like a Thunderjet, to any carburetor. This is another area where the inexperienced can cause damage, or more commonly,..loss of power.

Stage I

4 cyl Stock carbs set up for best street/strip performance:

K & N filter types
  1. Disassemble and thoroughly clean/inspect
  2. Re-jet for application
  3. Syncronize slides/throttles
  4. Recommend other tuning parameters

$200.00 (single carbs $100.00)


Stage II

4 cyl stock carbs modified for maximum race performance. Includes all Stage I work plus the following:

HD carb types
  1. Modify for maximum air-flow, bore/hone/radius etc.
  2. Re-jet for intended use
  3. Recommend other parts or modifications

$350.00 -(single carbs $130)


Stage III

4 cyl Keihin flat-side 37, 39, 41 and 42 mm. Includes all Stage II work plus the following:

  1. Intake manifolds ported as needed
  2. Recommend all other tuning parameters
  3. Completely set-up, carburetes better than stock!!!

These are the best multiple cylinder carbs available for any purpose.....period!!

$700.00 - $1100.00


Optional cold ram-air box

May be used on all stages

$1200.00 Installed (FZR, others custom only)


Special 6 speed transmission

Available as a bolt-in kit or custom installed. (not recommended for 1/4 mile)

$1800.00


Custom 4 into 1 headers

KT torque Header

Kooks, KT, V&H, etc available too !

Custom exhaust, flowed, dynotuned, special order only, all hi-perf coatings,chrome, available, carbon fibre mufflers also

If you have to ask...allright, ..most twins start at $400 --4 cyl $600


Billet clutch baskets

Billet basket

most popular in stock, others allow 1 week for production



J.C. Performance Engineering

617-06 Bicycle Path
Port Jefferson Station, NY 11776
631-928-9863


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Page created & maintained by JC, jeff@jcperformance-engines.com. Created: 9/25/96