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  Topic Review (Newest First)
04-20-2019 07:27 AM
shadetree its even posb ( but I dont see it happen ) the bolt that holds the decompression lever inside the rocker box backed out, fell out ?, missing ?, and the lever has worked its way out of the rocker box ?.
04-20-2019 07:16 AM
Goober On the 300 engine?

Check the manual for the decomp adjustment procedure—now I remember there’s no cable.

Possible the return spring is broken and you need a new one
04-20-2019 07:15 AM
shadetree
Quote:
Originally Posted by Tymartinizgood View Post
Quote:
Originally Posted by Goober View Post
Cool info FF!!
So @Tymartinizgood ya got a couple engines there and a frame; not a waste of time necessarily. Got some options. Since you don’t know the history of the machine or what’s been modified, that could complicate the restoration.
Two schools of thought!
Restoration or modification? Remember David Bowie in Zoolander? “First model walks; second model duplicates, then elaborates.”

Another pitch again for you to follow Shadetree’s 1988 TRX300 restoration. Maybe we’ll be able to sort out your problems with that 88 engine and frame
so I finally figured out what that loud noise was every time I tried to start it, it’s the thing that pushes the valves down, it’s almost like it slips and the. Catches off the top of the valve spring. Would that mean that I have a bent valve?
that is your decompression exhaust valve release. its posb the valve is bent ?, but with luck ( I never have luck !..lol ) the return spring for the lever is off..broken ?.
04-20-2019 12:41 AM
Tymartinizgood
Quote:
Originally Posted by Goober View Post
Cool info FF!!
So @Tymartinizgood ya got a couple engines there and a frame; not a waste of time necessarily. Got some options. Since you don’t know the history of the machine or what’s been modified, that could complicate the restoration.
Two schools of thought!
Restoration or modification? Remember David Bowie in Zoolander? “First model walks; second model duplicates, then elaborates.”

Another pitch again for you to follow Shadetree’s 1988 TRX300 restoration. Maybe we’ll be able to sort out your problems with that 88 engine and frame
so I finally figured out what that loud noise was every time I tried to start it, it’s the thing that pushes the valves down, it’s almost like it slips and the. Catches off the top of the valve spring. Would that mean that I have a bent valve?
04-20-2019 12:36 AM
Tymartinizgood
Quote:
Originally Posted by fishfiles View Post
A Fourtrax 250 and a 300 jug are the same , the cc displacement embossed into the jug is different on the two jugs , but that displacement is from the stroke , the only physical difference between the two jugs is the hole for the slack adjuster is bigger on one and you have to use the 250 adjuster on the 250 jug or grind the hole bigger to use a 300 adjuster

I have a 300 engine right now that has a 250 jug on it , so I know it works -----you can also use the 250 head on a 300 , but a 250 head doesn't have a decompression lever ------ the 250 cam and cam sprocket can also be used on a 300 , it is an upgrade as the 250 cam chain is heavier duty and the cam a bit hotter ---you can also take the output shaft out a 250 engine and put in a 300 output shaft and put the 250 engine in a 3002wd

Yeah your absolutely right because when I had the head took off of the 250 motor I noticed that the timing chain seemed to be a lot bigger, I think that’s kinda crazy honestly on Honda’s part, lol but hey if it works it works. I now have both motors in peices and it’s 3 am and I’m kinda just sitting here in the middle of all this and probably need to call it a day because everything is starting to get a little confusing haha. Thanks for all the quality advice you guys helped me out with you helped me a lot.
04-19-2019 07:01 AM
Goober Cool info FF!!
So @Tymartinizgood ya got a couple engines there and a frame; not a waste of time necessarily. Got some options. Since you don’t know the history of the machine or what’s been modified, that could complicate the restoration.
Two schools of thought!
Restoration or modification? Remember David Bowie in Zoolander? “First model walks; second model duplicates, then elaborates.”

Another pitch again for you to follow Shadetree’s 1988 TRX300 restoration. Maybe we’ll be able to sort out your problems with that 88 engine and frame
04-19-2019 02:18 AM
fishfiles A Fourtrax 250 and a 300 jug are the same , the cc displacement embossed into the jug is different on the two jugs , but that displacement is from the stroke , the only physical difference between the two jugs is the hole for the slack adjuster is bigger on one and you have to use the 250 adjuster on the 250 jug or grind the hole bigger to use a 300 adjuster

I have a 300 engine right now that has a 250 jug on it , so I know it works -----you can also use the 250 head on a 300 , but a 250 head doesn't have a decompression lever ------ the 250 cam and cam sprocket can also be used on a 300 , it is an upgrade as the 250 cam chain is heavier duty and the cam a bit hotter ---you can also take the output shaft out a 250 engine and put in a 300 output shaft and put the 250 engine in a 3002wd
04-19-2019 01:40 AM
Tymartinizgood
Quote:
Originally Posted by Goober View Post
So very important that you check the VIN regarding your saying it’s a 96 TRX300; you said the 1988 engine ran in it?

Okay so anyway see the parts link in my sig block? Click the rocky mtn link and select atv, then year, then you’ll see a list of quads with VINs. Search for your VIN and wallah you can determine your model year frame.

Engine Listing
https://www.hondashop.com.au/wp-cont...l-ID-Chart.pdf

1988 project check this man out!
https://www.hondaatvforums.net/forum...-trx300fw.html
A 87 trx250?!? LOL! Well that’s kinda strange bc it says it’s 281 cm ? Is it even possible to put a 300 top end on a 250 bottom end? Because I have looked at your pictures and that is what it says the numbers are. I still have my 88 300 motor, had no clue what year it was or I would’ve never swapped it out.wow I can’t believe I’ve done all this work for nothing though that really sucks. Thanks for helping me out though guys. And the frame is an 88 too after I looked it up, apparently the guy I bought this from has no idea what he has.
04-18-2019 10:46 PM
Goober So very important that you check the VIN regarding your saying it’s a 96 TRX300; you said the 1988 engine ran in it?

Okay so anyway see the parts link in my sig block? Click the rocky mtn link and select atv, then year, then you’ll see a list of quads with VINs. Search for your VIN and wallah you can determine your model year frame.

Engine Listing
https://www.hondashop.com.au/wp-cont...l-ID-Chart.pdf

1988 project check this man out!
https://www.hondaatvforums.net/forum...-trx300fw.html
04-18-2019 10:37 PM
shadetree
Quote:
Originally Posted by Goober View Post
This pic of TRX300 engine numbers is out of the manual–the TE06E-82xxxxx engine you show appears to cross ref to a 1987 TRX250.
lol, he put a trx250 motor in a trx300 frame ?..lol.
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