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Old 03-18-2015, 10:05 AM
shorfa12 shorfa12 is offline
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Default I am New here

Hey guys how are you today.
Well my name is Ash. am new here . i work as general manager for Heavy Duty company..
when i was cleaning my warehouse . i found 1 new and very clean Honda GX390... it was on Big water pump with heater but the pump was dismantle..... i am planing to build go kart. i live on the beach so i want to know if this engine will give me enough power for the Kart. i found some plans on the internet to start with and i have big work shop. but i need some advice that can help me ... thank you so much.

Regards
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Old 03-18-2015, 12:25 PM
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Welcome, our new Liberian friend! Got any pictures?
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Old 03-18-2015, 01:49 PM
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Welcome, Ash! The Honda GX390 is a GREAT engine, it will not disappoint you. It will have plenty of power for all but the largest projects.
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Old 03-19-2015, 12:15 AM
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Welcome!! That engine will be more than enough power. Just make sure that the output shaft is a straight keyed shaft, and not taperd. You will not be able to use it with a tapered shaft
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Old 03-20-2015, 04:23 PM
shorfa12 shorfa12 is offline
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thank you so much. guys.
luckily the shaft is straight keyed.
you can't imagine how much i was worry to know if the was keyed or tapered... until i had to go back to the company to make sure ...
tomorrow i will take picture for the engine...
i didn't start with the frame yet i have some plans ill show you the draw . i found the design on the net with pdf file explains most of the things.
and am still searching for the parts. i bought 40" x 1 1/2 inch square pipe to start with...
am wondering do i need any special clutch for the engine.
and is it a good idea to use sport motorbike brakes..?
and what shaft size i should use for back...
cheers
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Old 03-20-2015, 05:05 PM
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Quote:
Originally Posted by shorfa12 View Post
I bought 40" x 1 1/2 inch square pipe to start with...
40" (inches) or 40' (feet)? 40" won't go very far

Quote:
Originally Posted by shorfa12 View Post
am wondering do i need any special clutch for the engine.
There's two main types of clutches, centrifugal clutch



or torque converter



Either way, with the big engine, it's gonna cost you...

Quote:
Originally Posted by shorfa12 View Post
and is it a good idea to use sport motorbike brakes..?
The rear disc brake setup should be enough; the difficult part is you will need to make (or have made) a hub to connect the disc to the axle

Quote:
Originally Posted by shorfa12 View Post
and what shaft size i should use for back...
1" shoud be enough but, if the kart will have some rough treatment, go to 1 1/4" (although, availability is the important part of the equation)
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Old 03-20-2015, 07:13 PM
shorfa12 shorfa12 is offline
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Default 40" (inches) or 40' (feet)? 40" won't go very far

i meant 40' (feet)
thanks for the information's.
tomorrow i will going to motor bike scrap yard... am sure i might find some stuff that i need.
i was thinking about using Raptor unit for the back... if i find 1 i will send you some picture to check it up.

thank you for your help glad to join this form
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Old 03-21-2015, 03:41 PM
shorfa12 shorfa12 is offline
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Quote:
Originally Posted by robertdjung View Post
Welcome, our new Liberian friend! Got any pictures?
here are the pictures of the engine.
and some other pictures for the Bikes Grave yard.
i went to check for some parts. i felt sorry for the bikes there... almost 30 bike scraped ..

i guess if i don't find the clutch here in Liberia i will have to order it from the states.
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pump1.jpg   02.jpg  

03.jpg   scrap1.jpg  

clu.jpg  
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Old 03-30-2015, 08:32 PM
shorfa12 shorfa12 is offline
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hey guys how are you doing.
good news . tomorrow i will receive 4 tyres and back axle with the sprocket and the brakes + the clutch. i had all with very good price.
i want to know if the clutch used to be on 450cc engine will work. the bike shown in the picture
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Old 03-30-2015, 08:35 PM
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well if your talking about one of the dirt bike or atv than no it wont. you need a centrifugal clutch that is made for a gokart engine. like this one........... http://www.mfgsupply.com/gomini/gomi...max/4-455.html but now i see you r runing a gx390 engine and u would be beter off geting a torque converter with that engine bing so big. http://www.mfgsupply.com/gomini/gomi...s/218355a.html
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Old 03-31-2015, 12:13 AM
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No, you wount be able to use a bike or ATV transmission with a GX390
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Old 03-31-2015, 09:32 AM
shorfa12 shorfa12 is offline
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i forget to mansion its Kawasaki ATV i bought the whole unite less than 250$. but if the Torque Converter for the ATV doesn't work. that's mean i have to order it and ship it to Africa with DHL. i guess it will cost me double price. i wish if Caterpillar parts could fit there it would be to easy for me ... lol ..
cheers.
thanks for the help.
  #13  
Old 04-01-2015, 12:06 AM
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With a GX390, you are going to have to use a torque converter, similar, if not the same, as a comet 40 series. You won't be able to use any other transmission off a motorbike or ATV, because the engagement RPM's of these transmission are different (usually more) than what your GX390 can give. A GX390 is usuallt governed to 3600 - 4000RPM's
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