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SilentBob

TRX400fw Carb

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Hello everyone! I have a new to me trx400fw that I got last year from my father in law for the great price of free. It runs and drives but from what I can tell its had a hard life, I'm currently getting a parts list together to rebuild this thing. So here is my first issue, I replaced the carb that was on it (not OE) with a Chinese knock off and while it currently works with this carb it leaks fuel and i'm not happy with it. I looked at PSN and they have an OE carb for $300 but from reading around here a 450 carb should work as long as I replace the jets? Would that work because I can get a 450 carb for $180 this is the carb I was looking at getting (link below). Also the choke cable is missing would I need one for this carb to work? 

 

Thanks!

 

 https://www.ebay.com/itm/232030987596?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&mkscid=101&itemid=232030987596&targetid=1645685073288&device=c&mktype=&googleloc=9011025&poi=&campaignid=16730423415&mkgroupid=135815925780&rlsatarget=pla-1645685073288&abcId=9300841&merchantid=137699629&gclid=CjwKCAjwzNOaBhAcEiwAD7Tb6JbIHRiARVU5VEP_xuIV7Zz1tznvWP8b7lRQVmf48yqcOKBtjJuAWxoCiFwQAvD_BwE

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2 hours ago, SilentBob said:

Hello everyone! I have a new to me trx400fw that I got last year from my father in law for the great price of free. It runs and drives but from what I can tell its had a hard life, I'm currently getting a parts list together to rebuild this thing. So here is my first issue, I replaced the carb that was on it (not OE) with a Chinese knock off and while it currently works with this carb it leaks fuel and i'm not happy with it. I looked at PSN and they have an OE carb for $300 but from reading around here a 450 carb should work as long as I replace the jets? Would that work because I can get a 450 carb for $180 this is the carb I was looking at getting (link below). Also the choke cable is missing would I need one for this carb to work? 

 

Thanks!

 

 https://www.ebay.com/itm/232030987596?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&mkscid=101&itemid=232030987596&targetid=1645685073288&device=c&mktype=&googleloc=9011025&poi=&campaignid=16730423415&mkgroupid=135815925780&rlsatarget=pla-1645685073288&abcId=9300841&merchantid=137699629&gclid=CjwKCAjwzNOaBhAcEiwAD7Tb6JbIHRiARVU5VEP_xuIV7Zz1tznvWP8b7lRQVmf48yqcOKBtjJuAWxoCiFwQAvD_BwE

yes, a 450 carb will work on your 400, but please check to see if the jets are the same ?, i do not know, as i have not checked to see.

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9 hours ago, shadetree said:

yes, a 450 carb will work on your 400, but please check to see if the jets are the same ?, i do not know, as i have not checked to see.


Thanks for the reply, I checked the jets on both and it looks like it would work. The only thing is there’s 3 different main jet sizes 120, 125, and 130. 130 is listed as the main for both carbs but it doesn’t say which size it comes with in either carb option. 
 

Do you know if the heater assembly on the 450 carb would give me any problems with it not being hooked up? #12 
 

 

https://www.powersportsdiscount.com/oemparts/a/hon/506bc1bbf870023420a23799/carburetor

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52 minutes ago, SilentBob said:


Thanks for the reply, I checked the jets on both and it looks like it would work. The only thing is there’s 3 different main jet sizes 120, 125, and 130. 130 is listed as the main for both carbs but it doesn’t say which size it comes with in either carb option. 
 

Do you know if the heater assembly on the 450 carb would give me any problems with it not being hooked up? #12 
 

 

https://www.powersportsdiscount.com/oemparts/a/hon/506bc1bbf870023420a23799/carburetor

just checked the jet sizes, you will be good no matter what size you run, 120, 125, 130 will run just fine. as for the carb heater not being hooked up ?, it will run fine without it. they really serve no purpose on these machines , unless you live in alaska ?..lol . CAUTION: IF YOU RUN A SNORKEL SET-UP ?, THEN YES..THE JET SIZES WILL MATTER !. i do not run snorkels at all, so i do not worry about it.

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3 minutes ago, shadetree said:

just checked the jet sizes, you will be good no matter what size you run, 120, 125, 130 will run just fine. as for the carb heater not being hooked up ?, it will run fine without it. they really serve no purpose on these machines , unless you live in alaska ?..lol . CAUTION: IF YOU RUN A SNORKEL SET-UP ?, THEN YES..THE JET SIZES WILL MATTER !. i do not run snorkels at all, so i do not worry about it.

Thanks shadetree, I plan on keeping this bone stock where I can. The next step is finding an air box mine didn’t come with one.

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