SMALL BLOCK

Stage 1 & 2 upgrades do very well the the Mikuni VM22mm Round Slides. 

Mikuni Round Slide

• 22mm Small Body: Chinese Mikuni copy of a VM22. This is a huge seller and works great for the cost. Up to 16+ HP. We use these on most engines and Carb Kit and recommend them. Take caution as there are a lot on the market in varying qualities. Also, there are two different thread sizes for the main jet. Most use the M5 x .8 (Keihin), and we do offer these. They use the Mikuni pilots, but we have found some that use Keihin pilots. Manifold length does not seem to matter that much. For the most part, they are great bolt-on kits. Use a #135 main jet to start. Does not respond well to methanol conversions. Always use an air filter!
• 22mm Large Body: Genuine Mikuni VM22. Better quality and easier to tune than the Chinese version, but costs more. 17 HP.

Flat Slide

• 24mm Mikuni: Best carb for high HP gas. Takes a bit of tuning, but once right, it's awesome! Not for methanol. 20+ HP. Best for big bores and strokers.
• 28mm Mikuni Gas: Not recommended
• 28mm Mikuni Methanol: These make great methanol carbs that will support all big bore and stroker motors. Cannot convert back to gas.
• 28mm Black Carb (Nibbi): They seem to work great. They are based on a Keihin, built specially for racing. 20+ HP.

Tillotson

• Tillotsons make good power, but they are very hard to tune. Unless the customer knows Tillotsons, we do not recommend them.
• 304: Provides up to 20 HP

Walbro PZ26

• World Formula Carburetor: Nice carburetor that will support 18+ HP. It is equivalent in quality to the Japan PZ22. Easy to tune, but we only sell a jet kit (no individual jets).

BIG BLOCKS

Mikuni

• 33mm Pumper: Best carb for GX390s-GX460s. Has a pumper circuit, so great throttle response. 35+ HP. Alky or methanol. Recommended for open builds.
• 34mm Round Slide: Nice bolt-on carb. We have seen this run as high as 35 HP. Use on GX390s or larger. This is our main seller. Recommended for economy builds!
• 34mm Flat Slide: Has the potential for more HP than the round slide and more options for tuning.
• 28mm Flat Slide: Use only on GX270s.
• 38mm Flat Slide: Good if you want a big carb, but we have not personally seen any power increases. Typically 33 or 34mm will support all the air the engine can use.