1986 TRX300 4x4 Timing - Honda ATV Forum
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post #1 of 15 (permalink) Old 07-20-2010, 06:14 PM Thread Starter
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1986 TRX300 4x4 Timing

Hello all
I am new here and I have a question about my TRX300. I started to notice some noise coming from my motor the other day and it started to blow smoke. I tore it down and the cylinder was a little marked up. I ordered a new piston and ring's kit, had the machine work done and now I am stuck. I can rebuild a 2 stroke but don't know much about the 4 stroke's. How do i set the timing on this thing? also The piston that I got was .050 over do I have to re-jet the carb? If so what jet should I use? Also on a 2 stroke I know that you have to re adjust the needle and run at wot and check plug and re adjust as necessary but how do I do it on a 4 stroke? Thank you all very much in advance.
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post #2 of 15 (permalink) Old 07-20-2010, 06:27 PM
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Welcome to the forums. Are you sure it's an '86? I don't think they started making the Fourtrax 300 until 1988. If it's an '86, it might be a Fourtrax 350. Let me know for sure if it's the 300 or 350 and I'll post instructions for timing it.

You shouldn't have to worry about rejetting it.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.

Last edited by Helmut; 07-20-2010 at 06:34 PM.
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post #3 of 15 (permalink) Old 07-20-2010, 08:37 PM Thread Starter
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Welcome to the forums. Are you sure it's an '86? I don't think they started making the Fourtrax 300 until 1988. If it's an '86, it might be a Fourtrax 350. Let me know for sure if it's the 300 or 350 and I'll post instructions for timing it.

You shouldn't have to worry about rejetting it.
It is a 1989. I was wrong lol sorry about that. I was told it was an 86 but I just checked the plate and it is an 89. I am glad I will not have to re jet that will save me some money.
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post #4 of 15 (permalink) Old 07-20-2010, 08:48 PM
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Here you go. Just make sure you put the cam in with the lobes facing down. You don't have to make that tool to retract the timing chain tensioner. You can use a small flat screwdriver to retract it. You just have to hold it in the retracted position until you get the tensioner bolted back on.

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #5 of 15 (permalink) Old 07-20-2010, 09:15 PM Thread Starter
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Helmut you are a god. I have been reading a lot of the posts here and you seem to know everything about these machines. Thank you. This will make my day tomorrow much more easy. Ok so now after i get the timing set how do I go about setting the needle with the clip on it? Thank You

Bill
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post #6 of 15 (permalink) Old 07-20-2010, 09:27 PM
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Quote:
Originally Posted by billw129 View Post
Helmut you are a god. I have been reading a lot of the posts here and you seem to know everything about these machines. Thank you. This will make my day tomorrow much more easy. Ok so now after i get the timing set how do I go about setting the needle with the clip on it? Thank You

Bill
I don't think you will need to rejet or adjust the needle, either one, because of the 0.50 overbore. It should be fine.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #7 of 15 (permalink) Old 03-07-2011, 05:57 PM
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Quote:
Originally Posted by Helmut View Post
Here you go. Just make sure you put the cam in with the lobes facing down. You don't have to make that tool to retract the timing chain tensioner. You can use a small flat screwdriver to retract it. You just have to hold it in the retracted position until you get the tensioner bolted back on.

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Hi, i'm new to this forum too i got a trx 350 1986 do you have this timing file for this or a link. I got an noise coming from the engine when its cold. Ithink there a loose in the timing chain i got to check this out. a lot of smoke too in warm up.

ThX love this forum !!
Pat
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post #8 of 15 (permalink) Old 03-07-2011, 06:15 PM
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Originally Posted by pat2330b View Post

Hi, i'm new to this forum too i got a trx 350 1986 do you have this timing file for this or a link. I got an noise coming from the engine when its cold. Ithink there a loose in the timing chain i got to check this out. a lot of smoke too in warm up.

ThX love this forum !!
Pat
Welcome to the forums. Here are the procedures for the '86 Fourtrax 350.

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #9 of 15 (permalink) Old 03-07-2011, 06:33 PM
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Quote:
Originally Posted by billw129 View Post
Helmut you are a god. I have been reading a lot of the posts here and you seem to know everything about these machines. Thank you. This will make my day tomorrow much more easy. Ok so now after i get the timing set how do I go about setting the needle with the clip on it? Thank You

Bill
hes not god..he's just one heck of a pic man around here !!..lmfao..he's not the only one that knows these machines !..lol.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #10 of 15 (permalink) Old 03-07-2011, 06:37 PM
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Between his pics and your paintings, you guys could be an awesome team!

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> Click Here for Answers to Cleaning, Compression, Jetting, Carb Issues, Model Specific problems etc.

>> Click Here to Download your Service/Repair Manual



1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
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2008 TRX450ER - No Lid, HRC Kit, 162 Main, 45 pilot, 55 leak jet

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