1986 trx 350 - Honda ATV Forum
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post #1 of 9 (permalink) Old 02-26-2011, 07:45 AM Thread Starter
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1986 trx 350

Hi, I have a 86 trx 350 (since new) It has been great. Last summer it just stopped running. Replaced the plug, fuel filter, and fuel pump. Seems to have decent spark, although I am no mechanic. It does seem to want to pop (fire) a little bit while cranking but it is not a typical pop (very weak). If it is the cdi or pulse generator that is bad, would there be any spark at all? The carb was rebuilt a couple of years ago so it could be this, but that is not my first guess. How about a timing issue. Any suggestions please. With my work situation,I would love to try to fix it myself as opposed to bringing it in.
THANK YOU!!
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post #2 of 9 (permalink) Old 02-26-2011, 08:31 AM
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Welcome to the forums! I would say maybe carb needs cleaned, but Shadetree is the resident 350 guru, he'll be around shortly to help you out.

1988 FourTrax 300
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post #3 of 9 (permalink) Old 02-26-2011, 09:50 AM
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Welcome to the forums. If it has a good strong, bright blue spark at the sparkplug, I would look for a fuel/carb problem. Check your fuel pump fuse and if it's good, pull the fuel line off the carb and see if the fuel pump is pumping.

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 #4 of 9 (permalink) Old 02-26-2011, 10:08 AM
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have you had your valves checked? they may be out of adjustment as well. if it hasnt been done, while your cleaning the carburetor i would check your valve clearance
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post #5 of 9 (permalink) Old 02-26-2011, 10:43 AM Thread Starter
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Thanks everyone for the quick replies. I will check the spark again to see if it is bright blue. (I recall a lighter (white?) spark, not blue.) I have never had the valves checked. Is this something that I can do myself? The fuel pump is pumping fine. I will not be able to look at it again for a couple of days to check out all your ideas, but will asap. Any other possibilities? Thanks again You guys are great!
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post #6 of 9 (permalink) Old 02-26-2011, 10:51 AM
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Here's something else you can try. Remove the sparkplug and pour a Pepsi bottle cap or two of gas down into the cylinder. One capful is probably enough, but you will likely spill some trying to pour it into the sparkplug hole, so it may take two. Quickly, put the sparkplug back in and put the sparkplug wire back on and see if it will start for a second or two. If it does, and your fuel pump is pumping good, you will need to remove the carb and give it a good cleaning. You can also put some gas in a spray bottle and spray it into the back of the carb and get the same results.

Also, it's not too hard to check and adjust the valve clearance.

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 9 (permalink) Old 02-26-2011, 10:58 AM
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When checking and/or adjusting valve clearance, make sure the engine is completely cold and make sure you have the piston on TDC on the compression stroke and not TDC on the exhaust stroke.

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 #8 of 9 (permalink) Old 02-26-2011, 01:21 PM Thread Starter
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HI, I just checked the plug again. It does have a blue spark, but not what I would call strong. Maybe that is just me. I poured gas in the piston. It did pop more frequently, but not what I would consider a strong pop. It did pop more when I pumped the gas and then let off the throttle. I won't be able to check the valves for a couple of days though. I am not quite sure that I am qualified to do that, but will try. Thaks,guys
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post #9 of 9 (permalink) Old 02-26-2011, 02:15 PM
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how's the compression ?..it takes alot more psi to get these old gals running than a trx300..these bikes call for 178-206 psi to run good..if you don't have this...your rings are worn too much.

'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho
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