350D engine into a 300 frame ??? - Honda ATV Forum
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post #1 of 18 (permalink) Old 01-01-2016, 09:59 AM Thread Starter
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350D engine into a 300 frame ???

any one know if it is possible to put a late 80's 350d engine into a say a 95-2000 300 Fourtrax frame , I think the rear would work out , the front I don't know about , I realize that I would have to use the 350D wiring harness and electrical components
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post #2 of 18 (permalink) Old 01-01-2016, 10:47 AM
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never heard of it attempted, i have seen fully welded hand built tube frames for 350D motors and suspension which is probably the easier way to go about it. its going to be a matter of if the motor mounts and shafts line up, and the other thing i could see being a problem is will the head clear the frame? thats a tough build if you ask me honestly.

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post #3 of 18 (permalink) Old 01-01-2016, 12:13 PM
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Yes, but you need to mount a T case to it to get the front driveshaft over, and get the rotation correct for the front diff. It's been done, and it's easier to swap the cranks and switch the top ends IMO.

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post #4 of 18 (permalink) Old 01-01-2016, 02:44 PM
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It is possible, Like mac said the t-case has to be rotated. I am in the process of building one and i cut the motor mounting peice of the 350 frame and combined it into a 300 frame. It is alot of work to do just the frame itself but its all about how much effort you want to put into it. It took me a total of about 12-13.5 hours to get the 2 frames cut apart and put together into one.

the 2 separate frames
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the one combined frame with a 3.75 body lift
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95 Honda 300- big red rear, 450r front shocks, 300ex rear shock, 2 inch snorkel, 6 inch lift, 8 inch stretch, monster heavy duty u-joint, 3 inch body lift, led bar, 29.5 og S/W outlaws, locker, disk brakes, 3500lb super atv winch , axle paddle, M4 motorcycle exhaust, 424, 54% reduction, big red cam, big oil cooler

88 Honda 300 frame with a 350D engine in it still a work in progress
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post #5 of 18 (permalink) Old 01-01-2016, 02:50 PM
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This is the thread i have been following when i needed help building a 350 foreman powered 300, | High Lifter Forums

95 Honda 300- big red rear, 450r front shocks, 300ex rear shock, 2 inch snorkel, 6 inch lift, 8 inch stretch, monster heavy duty u-joint, 3 inch body lift, led bar, 29.5 og S/W outlaws, locker, disk brakes, 3500lb super atv winch , axle paddle, M4 motorcycle exhaust, 424, 54% reduction, big red cam, big oil cooler

88 Honda 300 frame with a 350D engine in it still a work in progress
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post #6 of 18 (permalink) Old 01-01-2016, 03:48 PM
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What are you doing with the output shaft. It is way too high for the factory 300 swingarm and ujoint.

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post #7 of 18 (permalink) Old 01-01-2016, 08:31 PM
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Thats why i used the bottom section of the 350 foreman frame and welded it into the 300 frame. Plus i would have to make 1 motor mount that way. Along with a 350 foreman swingarm and this huge u-joint set up i have on my blue 300 that looks like this. This joint is about 5/8-3/4 of a inch bigger than the stock u-joint. The only down side is i had to move the swing arm mount over .25 because it was way to big even with the external u-joint design.
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Stock next to my driveshaft and u-joint
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95 Honda 300- big red rear, 450r front shocks, 300ex rear shock, 2 inch snorkel, 6 inch lift, 8 inch stretch, monster heavy duty u-joint, 3 inch body lift, led bar, 29.5 og S/W outlaws, locker, disk brakes, 3500lb super atv winch , axle paddle, M4 motorcycle exhaust, 424, 54% reduction, big red cam, big oil cooler

88 Honda 300 frame with a 350D engine in it still a work in progress

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post #8 of 18 (permalink) Old 01-02-2016, 02:36 AM Thread Starter
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Blue , nice looking work , is the bike up and running yet ------ your swing arm looks good but I would fear it isn't strong enough , I have broken the stock swing arms off the bike and was wondering how you sealed around the output shaft of the engine and the input of the final drive without the boot , the pinion seal alone wouldn't be enough to keep the dirt out for me
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post #9 of 18 (permalink) Old 01-02-2016, 09:33 AM
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It is running, i havent been on a ride to try it out though, i think it should be strong enough and if its not then i will have to make it stronger. The differential is packed full of grease so it keeps the water out. The out put shaft on the motor has a seal, its not much different than the side shaft seal so im not worried about that really.

95 Honda 300- big red rear, 450r front shocks, 300ex rear shock, 2 inch snorkel, 6 inch lift, 8 inch stretch, monster heavy duty u-joint, 3 inch body lift, led bar, 29.5 og S/W outlaws, locker, disk brakes, 3500lb super atv winch , axle paddle, M4 motorcycle exhaust, 424, 54% reduction, big red cam, big oil cooler

88 Honda 300 frame with a 350D engine in it still a work in progress
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post #10 of 18 (permalink) Old 01-02-2016, 09:36 AM
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Another thing too is i based my swing arm off of one that i know worked the idea came from this one. If i ever get time i was planning on adding 1-2 more braces and then call it good until it breaks or doesnt.

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95 Honda 300- big red rear, 450r front shocks, 300ex rear shock, 2 inch snorkel, 6 inch lift, 8 inch stretch, monster heavy duty u-joint, 3 inch body lift, led bar, 29.5 og S/W outlaws, locker, disk brakes, 3500lb super atv winch , axle paddle, M4 motorcycle exhaust, 424, 54% reduction, big red cam, big oil cooler

88 Honda 300 frame with a 350D engine in it still a work in progress
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