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Hey guys, I got a 440 Duromax engine. Billet flywheel, Billet side cover, Billet connecting rod. 275 Dyno cam, 55 lb valve springs. NR Racing Honda 390 Head with 40 mm intake, 38 mm exhaust stainless valves, head shave .060, (this NR Racing head has the small intake port for low end power...

I have a 6059 ARC GX390 Billet side cover. The PTO side cover seal blew out due to me installing the PVC in backwards! LOL. It actually looks okay but I'd feel safer putting a new one back in. I am fairly certain the ARC seal is thinner than the stock Honda GX 390 seal. I can't find a part...

I got my golf cart with a modified 440 Duromax out for it's first spin today. Went about a mile and it is obviously in need of smaller jetting. Just as I pulled in my driveway I heard a small pop followed by lots of white smoke! Popped the hood and oil everywhere. Took a minute or 2 and I...

I have tried a couple of those little cheapy tacks off amazon that did not work well. I got an Eqqus tack which uses an inductive pickup on the plug wire. It works poorly. RPM all up and down. I think the pickup is bad, I ordered a new one. The tach comes with 2 cable options, The...

I got some 3/8" ID clear silicon tubing to use as vent tubing for my 440 Duromax. Very flexible nice stuff. It says it's good for like 390 degrees for 10 hours. I have no idea what temp oil vapor is. Is this going to work or should I get something else? Thanks

I have a Duromax 440 going into a golf cart. It has a NRracing Honda ported head with small intake port head milled .025, 275 cam all the billet stuff. Advanced to 34 BTDC. I have a Mikuni 34 mm round slide. What jets do I want to go with. I’m thinking 185 main? It has a 240 in it now. Haven’t...

Question. I have a 6 passenger cart I’m putting a 440 Duromax in. The engine is modified, cam, carb etc. I intend to mount one or possibly two 7” 12 volt fans in the engine bay to eliminate at least part of the heat from the engine. I am insulating that part of the body and under the seat as...

I have a 440 Duromax that I’m doing a little engine work on. Billet, cam, rocker arms. When I took the head apart to put stiffer valve springs in I was surprised by a couple things. 1. No valve seals. I doubt that’s a big deal. 2. The valve stems on this big block are 5.5 mm where all other...

I had my engine torn apart to put in a cam and such. Like the dummy I am I lost the valve lash caps! I ordered new Honda GX 390 caps and seals ( My engine had no seals) So I finally got them and the caps seem much too large diameter wise. I haven't put clay into them but I think the cap...

I have a large heavy kart, And I am a big guy. Just did test ride #2 and the brakes really aren't cutting it. Not sure of the hydraulic master cylinder or caliper as for a make. Chinese off Amazon. No air in the line for sure. Could be that I'm using a 8" rotor. Any suggestions? I think...

I watched Red Beard Garages video on what fits the 440 engine. The engine he used had a round starter. It uses a 10 bolt side cover so a 420/390 gasket won't fit as it has 7 bolts. I just learned this in the last week or so. A month ago I removed the side cover on mine to remove the low oil...

I have a new Duro Max 440 I put in my Go Kart. Did the first test run yesterday. Had the engine (electric start) running for 15-20 minutes. I shut it down and after 3-4 minutes went to fire it up and no go! At first I thought the battery was dead, I tried the pull starter and I thought I'd...

I've worn my fingers out looking for a wiring diagram for this engine. I am guessing it would be the same as a Honda 390. I have installed a second charge coil. I got a rectifier/Regulator for it. It has 4 wires. Green Ground, Red battery + side, a pink and a yellow which I am guessing goes...

I have a heavy cart with a Duro Max 440 which is a stock engine. I am looking at 2 different 40 series TAV units. But if anyone has a better suggestion please do so. Go Power Sports has this one which seems nice but uses a 5/8" jackshaft which I figure may we a weak point. 40 Series TAV...

I’m building my first go kart. LOL. I’m 70. anyway, I’ve built lots of stuff in the past. Mini bikes, Tote goats etc. I am a big guy. 6’5” and 275. My ice chest cart is big. 18” tall tires. I had a 208” Honda clone I built up a bit. Then I decided at the last minute to get a Duro Max 18 hp...

I'm building a large ice chest kart. Just for scope, I'm 6' 5" The tires are 18" tall. The frame is sunburst yellow. The huge Igloo ice chest is flat black with orange-ish flames. I'm not real crazy about the blue metal work on the Duramax. I'm just painting the blue stuff. I'm thinking...

New guy here. I’m an old guy 70.5 yrs on Gods good earth so far. I had 3 big time back surgeries last year and I’m still recovering. I have to use a walker still. So what does an old fat crippled man do while recouping? He build a huge ice chest kart. I have a Honda Clone engine ( Briggs CR...