[chad_m44]

I recently acquired a '93 300 and noticed at the back of the muffler on the bottom there is a hole with threads, what is the size of the plug/bolt that goes in there?

 

[Goober]

I recently acquired a '93 300 and noticed at the back of the muffler on the bottom there is a hole with threads, what is the size of the plug/bolt that goes in there?

Good question working on that myself on my 93!

That is the spark arrestor collector. You’re supposed to be able to blow out the collected bits of hot carbon. I don’t know anyone who ever does this lols

Possible you could get cited on NF lands for not having the plug

So yours is missing? I think it’s a 14mm coarse thread – ive heard of taps in 1.00, 1.25, 1.5 and 1.75—i had to drill mine out and am looking for the proper fitting too

 

[shadetree]

I believe that Is 17mm. dang near all bolts/threads on all Hondas are metric.

 

[Goober]

Yup could be 17mm i have a spark plug tap and it’s nearly that size
I will try to tap it with the 17mm

 

[chad_m44]

Yes, mine is missing. I've looked everywhere to find a replacement but have had no luck..

 

[shadetree]

Yes, mine is missing. I've looked everywhere to find a replacement but have had no luck..

got an old spark plug handy for your atv ?, if so ?, screw it in there, should fit for the time being .

 

[chad_m44]

Yes, I tried that but it was too small

 

[shadetree]

Yes, I tried that but it was too small

yeah, wasn't for sure if it was the same. you can try the bolt that fits in the 2000 trx350 ranchers, it '' should '' ?..be the same. but I know its metric, prob 17mm corse threads I am not sure about ?.

 

[chad_m44]

Whenever I figure it out, I'll let you know.

 

[shadetree]

maybe try going to lowes, having a look in the plumbing dept, see if they have this plug ?, it might be sae threads ?, and they carry tons of these cap plugs..you gotta think outside the box with atvs...lol.

 

[shadetree]

I think I may have one of these as a spare some where in my shop ?, don't normally have to replace these, as I never remove them...lol. where you located ?, you near Arkansas ?.

 

[chad_m44]

I'm in Louisville, KY

 

[_Wilson_]

maybe try going to lowes, having a look in the plumbing dept, see if they have this plug ?, it might be sae threads ?, and they carry tons of these cap plugs..you gotta think outside the box with atvs...lol.

I purge mine each year..... It's the OCD..."smirk" ..... :|

Here's a pic of mine. 18 thread pitch .... Go with a brass plug!

 

[Goober]

I had to drill my brass plug out. I have a 14mm tap which looks a bit small, but i will try to find a bolt first. Most of the plugs I’ve seen are pipe thread pitch so that’s why I haven’t fixed it yet

 

[chad_m44]

I used a drain plug size M16-1.5, it fit just fine.

 

[fishfiles]

maybe try going to lowes, having a look in the plumbing dept, see if they have this plug ?, it might be sae threads ?, and they carry tons of these cap plugs..you gotta think outside the box with atvs...lol.

I purge mine each year..... It's the OCD..."smirk" ..... :|

Here's a pic of mine. 18 thread pitch .... Go with a brass plug!

I don't like the way that thread gauge is sitting on them threads , not quite perfect -------- did you measure the diameter and try the mm thread gauges , would think it has to be a metric thread pitch like 1.50, 1.75. 2.00 -----

 

[_Wilson_]

Yep..... It comes close to 1.50 , but still doesn't match as good as 18 ....... My 97 doesnt have one, it was like that when johnny sold it to dave I'm taking mine to get a match soon..... This is what i don't wont to happen (seen this issue a lot @ the shop) so i think purging that build up is a good idea my metric gauge shows it to be 17 mm

Credit for the pic goes to fish

 

[fishfiles]

So you think it might be 17 x 1.50 MM ----------- I have never gotten one out , always tighter than Dick's hat band

I remember that pic , I got a tail pipe that fit right over that muffler , tried to find another one and never could , I bought a 96 muffler from Caltric before , it is still on the 2wd 300 ---if I remember right a muffler for a 300 is like $600+ and I wonder if they are still even available any more , I know I will never buy a new OEM muffler from Honda


I know my 92 300 was a different muffler , I put a 88 muffler on it , the one that makes a big U right out the exhaust port and it worked fine , the mounting bolts lined up , the later models muffler didn't line up with the mounting bolts , -- don't know a lot about 93 300s , one of the only years I have not had ----