1999 fourtrax 300 running rugh

3047 Views 20 Replies 4 Participants Last post by shadetree, Aug 22, 2017

Tractorboy

Discussion Starter · Aug 19, 2017

hello I recently perches'ed a 1999 honda fourtrax 300 4X4 and it was burning oil so I got a gasket kit and took the engine apart removed the old gaskets and seals and installed the new ones then put it back together and adjusted the timing then I went to start it and I had to give it a bit of throttle for it to start and the it would run really rough. Why? It allways ran vary well and smooth.

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shadetree

· #10 · Aug 20, 2017

most old Honda's are 0.006.

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shadetree

· #14 · Aug 22, 2017

SamUK said:
Tractorboy said:

Well I was right the timing was off so I got it right and it still ran a little rough so I cleaned the carb and now it runs great. Compression cold is 180 psi and hot is 170 psi thanks for your help

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Good work Tractorboy, compression is steering towards the low side but if your not a hard rider it should see you another season before you want a top end build.

Since you've had it apart doing gaskets etc now would probably be a good time to do an oil and filter change too, maybe throw a new spark plug in at the same time ;-)

180 psi is low ?....ummmm..maybe I missed the short little yellow bus again ?, but I know for a fact !!, the trx300's ( most ), have a min of 100 psi to just run, and your saying 180 psi is low ?..hmmmmm..lol.

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shadetree

· #15 · Aug 22, 2017

good deal OP !!.

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shadetree

· #17 · Aug 22, 2017

SamUK said:
170 is his warm reading, 180 cold so Yeah.. it's on the lower side of the FSM spec. 176 to 201 i think it is.. it may run at 100 but it's not right, there underpowered as it is, I dread to imagine what 100psi compression is like!

trx300's will crank and run at 100 psi, anything lower than this ?, they just won't act right. 170-180 will run a long time before it needs a top end job, take my word on this !..lol.

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shadetree

· #19 · Aug 22, 2017

SamUK said:
I agree, it will run, but it's not right, hence Honda specifying 178 to 206. I advised the OP as per the FSM specs ;-)

and your right, Honda specs WANT you to replace them..lol. his psi is fine for a long time, not arguing your point, your point is valid, my point is, he can run that trx300 for a few more years before he needs to do a top end job

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shadetree

· #21 · Aug 22, 2017

SamUK said:
Here here.. We'll agree to disagree then lol

agreed !..lmao.

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