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Product Description
Our Stage 1 Performance Kit is very popular and includes a K&N style high flow air filter, aluminum air filter adapter, and an upgraded drilled main jet for the carburetor. This kit is a simple but very effective upgrade over the stock air box. This kit needs to be paired with an aftermarket header for it to work properly. With the added air flow, the more rich main jet is mandatory for optimal engine performance. Filter inlet measures 2 7/16" ID and 2 7/8" OD. Includes choke hold bracket as well. Kits will ship with the air filter and air filter cover color we have in stock at the time.
Kit Includes:
- Air Filter
- Air Filter Cover (black)
- Air Filter Adapter (black or silver) w/ Choke Hold Bracket
- Either a 301 or 420 Jet
- Carburetor Gaskets
- Honda GX240 & GX270
- Predators Engines 301cc & 420cc
- Duramax 18HP Engine
Recommended Items:
- 301/420 Exhaust Gasket
- Vent Filter Kit
- 50# Valve Springs (if taking the governor out)
- Header Pipe for 301/420 Engines
#KDPRED301-420AF
Product Videos
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Product Reviews
23 Reviews Hide Reviews Show Reviews
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420 duromax and predator 420 use same parts?
Was wondering if the aftermarket parts from GPS would fit my Duromax 420 same as a predator 420
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Totally Worth It!
This kit is totally worth it, I have a comprehensive installation video on my YouTube channel 'Harrison Bennett'. I explain why these kits are effective and how to install everything.
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Stage 1...
The kit needs the 2 vent filters
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Performance is good!
Installed on my Predator 420 on my Murray Explorer frame!
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Stage 1 Performance Kit for 301/420cc...
Stage 1 Performance Kit for 301/420cc Engines
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420cc
I put stage 1 kit and 50lbs valve springs also exhaust. and I lost speed. With all stock parts and bypassed governer I was getting 31mph. Now with all this work Im only getting 24mph. Not a good thing.
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Predator 301cc stage 1...
Everything fit fine. I couldn’t use the provided jet as it made the engine run way too rich even when run without a muffler. Stock jet runs plenty rich. Fast shipping.
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Duramax...
Works great no complaints did exactly what I needed and could tell the difference
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Adapter and air filter fit nice, but the choke...
Adapter and air filter fit nice, but the choke hold Down tab did not line up at all. Had to bend it around quite a bit and it still doesn’t fit exactly right. Also I did not receive my pre filter with my order, I emailed the company a few days ago and have gotten limited responses. Still waiting to hear back about getting the pre filter.
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Out of...
Out of stock