John Deere 420 Mower, Lawn and Garden Tractor Category

Original Model: Onan

These kits will replace the Onan engines in JD420 tractors. Be sure to clarify whether the original engine model number starts with a `B` or a `P`. Original engine stopped production in December 2003. Our conversion kits allow you to update to a newer OHV V-Twin design engine without having to cut your hood or frame. You will receive a new PTO belt with any of the conversion kits for this tractor. You will receive a new throttle cable with this conversion kit. All of the kits are pre-wired to match the original wiring harness on the tractor. All kits will receive a new muffler as well.

Parts List

7 Products

Engines

386447-JD420-B-R4

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,750.00

ON ORDER: 4

Use 386447-JD420-B-R5

386447-JD420-B-R5

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 4

Temporarily out of stock. Order now or call 800-321-6725 for information

386447-JD420-B-R5

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 4

Temporarily out of stock. Order now or call 800-321-6725 for information

386447-JD420-B-R5

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 4

Temporarily out of stock. Order now or call 800-321-6725 for information

386447-JD420-B-R5

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 4

Temporarily out of stock. Order now or call 800-321-6725 for information

386447-JD420-B-R5

23hp OHV Vanguard V-Twin, with kit to fit into a JD420 with Onan "B" series engine, Briggs Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 4

Temporarily out of stock. Order now or call 800-321-6725 for information

386447-JD420-P-R4

23hp OHV V-Twin with kit to fit into a JD420 with Onan "P" series engine Briggs & Stratton Engine, Briggs & Stratton

$1,799.00

ON ORDER: 8

Use 386447-JD420-P-R6

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General Disclaimer

While we may have sold many engines listed above to be used for a John Deere 420 Mower, Lawn and Garden Tractor Category, we are NOT claiming these are exact replacements unless the product notes explicitly say so. Many original equipment engines may no longer be in production because of obsolescence or EPA regulations, so in some cases there may not be an exact replacement available. Our intention here is to show that other customers have utilized these in the equipment shown, but may have had to make some modifications to do so. If we know of any required changes, we will list those, however, some adapting during installation should be expected.