94 TRX300FW Power Issue - Page 2 - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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post #11 of 21 (permalink) Old 04-28-2019, 09:15 AM
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What are the code numbers on the side of the carb , yours should be VE90A for the 93 ----------- When cleaning that carb are you using compressed air from a blow gun to blow out every hole? I don't know about the sonic cleaner , I soak mine in a gallon can of Chem-tool . Is that diaphragm new , when the diaphragm is leaking the bike will run and sound perfect till 1/2 throttle and then fall on its ass ? -----sometimes after cleaning a carb say 6 times and it still don't run right , I have gotten another carb and all was well ------ Are you sure you have the timing right and not be a stroke off , with the "T" in the timing hole the lobs of the cam should be down , the bolt hole for the sprocket on the cam straight up at 12 0'clock and the two lines on the sprocket level in line with the head ----did you take a compression test ? ----a slight bend in the connecting rod with male it run out of time with lower compression ------- what about the rubber boot and o'ring on the boot , between the carb and air box , you can check for leaks there easy by spraying starting fluid around the boot , if it is sucking air then it will rev up

I have a 92 300 , when I got it it had a 350 carb on it , I switch sevral carbs around and never could get that bike to scream , I got the correct code carb from Manny and rebuilt that one and it screams now

now if the engine revs and you are not pulling well ( I kind of get that from your post ) , if you took the clutch apart and pinched a plate when reinstalling it is a problem , if you take your finger or a screw driver and try to move the ears of the plates of the clutch and some of them will move , then one is pinched and I seen where sometime it won't move at al , but other times it will move but not perform worth a crap
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post #12 of 21 (permalink) Old 04-28-2019, 06:51 PM Thread Starter
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Hey Fish! Man, I'll have to look and see what numbers are on it. The carb that was on it when I got it was a China Fleabay POS and got an actual factory carb off a 93 and mine is a 94, same carb, when I did the inital rebuild not quite 2 years ago. I've checked the diaphragm, taken all the jets out and blew through each and every one after the sonic cleaner. Also I found someone that had 2 intake boots that were NOS Honda parts when I did the inital build so the one on it and O ring is new and excellent seal there and tried the ether test. I wondered about the pressure plates but thought it either wouldn't pull at all or wouldn't shift if those were pinched or outta whack, so you're saying it could still pull and shift, just half assed and cause the symptoms I'm experiencing? I know my carb is right as rain, butterfly opens and closes, slide sliding as it should, new diaphragm and everything so I'm starting to think it's something else and that would make sense but went by the manual which led to me the carb as well as talking to Jeep and he said it sounds carb related also. I'll pull that right side cover and see what I can find in there and let ya know what i find. If one is pinched will it cause any weird wear or anything on them or the ones pinched? It hasn't ran much but have tried it across the field a few times to check after adjustments and stuff so hopefully haven't messed them up, they're pretty tough but just wanna ask and make sure I haven't torn something else up lol. Thanks for the suggestion and your expertise, much appreciated brother! Thanks!
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post #13 of 21 (permalink) Old 04-28-2019, 06:58 PM Thread Starter
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Oh, and I know beyond a shadow of a doubt the timing is spot on. That's the 1st thing I thought about but it started before the starter made a sound, never started so good! But I checked it several times, pulling the plug and making sure it's on the exhaust stroke, everything is lined up with all the marks and everything. Valves are set spot on also, it actually sounds like a sewing machine, idles beautifully but just a big lack of power and have to really give it so much throttle to actually get it to go anywhere and it's never been like that. I guess the power, or lack thereof, would best be described as like the brakes on the rear are locked up and you're trying to give it throttle with that type response. Half throttle or more to even get it to get going and shift a gear or two, just crazy.
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post #14 of 21 (permalink) Old 04-29-2019, 08:03 AM
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Oh, and I know beyond a shadow of a doubt the timing is spot on. That's the 1st thing I thought about but it started before the starter made a sound, never started so good! But I checked it several times, pulling the plug and making sure it's on the exhaust stroke, everything is lined up with all the marks and everything. Valves are set spot on also, it actually sounds like a sewing machine, idles beautifully but just a big lack of power and have to really give it so much throttle to actually get it to go anywhere and it's never been like that. I guess the power, or lack thereof, would best be described as like the brakes on the rear are locked up and you're trying to give it throttle with that type response. Half throttle or more to even get it to get going and shift a gear or two, just crazy.

There's valve timing, with the cam chain, and ignition timing via the CDI. Though after thinking about it, I don't think timing would cut off power so abruptly.


I think it could be more of an air flow issue, the throttle or clogged exhaust.


You might also try it without the fuel filter to be sure it's not a fuel volume issue.
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post #15 of 21 (permalink) Old 04-29-2019, 12:24 PM
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Wonder if the CDI might be on its way out?


Might be time to order another carb and try it. Process of elimination, and everyone needs an extra carb on hand anyway, right? LOL

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post #16 of 21 (permalink) Old 04-29-2019, 01:06 PM
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Wonder if the CDI might be on its way out?


Might be time to order another carb and try it. Process of elimination, and everyone needs an extra carb on hand anyway, right? LOL



Probably only you and TooDeep fit into that category.

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post #17 of 21 (permalink) Old 04-29-2019, 10:41 PM
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Hey now, most of mine are efi now.. lol

On the op... have you tried messing around with the airbox lid removed, possibly filter and using your hand to change fuel mixtures on the intake side?

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post #18 of 21 (permalink) Old 06-16-2019, 11:42 PM Thread Starter
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Well, I told y'all that when I figured out what it was that it would be something simple and I'd feel dumb as a sack of hammers! Well, I DO!!! LMAO!!!! The friggin diaphragm wasn't seated well and out of the groove in one little bitty spot about an eighth of an inch or less was causing a vaccum leak and wasn't pulling it like it should when on throttle. I took it back off, got it all back like it should be, put the top back on and got her all hooked back up and BINGO!!!! WFO and running like a striped ape!!!
Now, here's what just absolutely sucks! I've got a cracked case half and now have to take the motor out, tear it down and put it all back in my new cases, put everything back on and install the motor 🤢🤮🤯!!! I'm just stunned but sooooo glad I caught it at home vs out on the trails hours from home, not to mention if it would have ran the oil out of it riding and locked it up and trashed it. So, after going through all that crap and y'all racking your brains helping me I gotta do all this mess! I'm so not looking forward to it but it must be done! I got a matching set from PSN off a 98 that were in excellent condition and dang near clean as new ones, and 49 bucks! So I'll use those since they're a matching pair then repair the cracked one and have a spare of matching ones, which is always a good thing to have for the when and if.
So, I more than appreciate everyone chiming in and helping out, y'all are awesome!!! I'm going to try and get started on tear down tomorrow and hope to have it out and on the build table and ready to open up and start the transfer. Should I just add pics and everything to this thread or start a new one for all that, what do y'all think? I'll definitely post plenty of pics and progress for everyone since we're all pic junkies LMAO!!! Thanks again guys and I'm sure even though I've done this before and have a manual that I'll end up with a few questions, never fails and let me know y'alls input about keeping it going here or new thread! 😁
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post #19 of 21 (permalink) Old 06-17-2019, 08:45 AM
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Thanks for coming back with the answer, all threads should end thus way.
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post #20 of 21 (permalink) Old 06-17-2019, 11:37 AM
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Quote:
Originally Posted by PowerStroke70 View Post
Well, I told y'all that when I figured out what it was that it would be something simple and I'd feel dumb as a sack of hammers! Well, I DO!!! LMAO!!!! The friggin diaphragm wasn't seated well and out of the groove in one little bitty spot about an eighth of an inch or less was causing a vaccum leak and wasn't pulling it like it should when on throttle. I took it back off, got it all back like it should be, put the top back on and got her all hooked back up and BINGO!!!! WFO and running like a striped ape!!!
Now, here's what just absolutely sucks! I've got a cracked case half and now have to take the motor out, tear it down and put it all back in my new cases, put everything back on and install the motor 🤢🤮🤯!!! I'm just stunned but sooooo glad I caught it at home vs out on the trails hours from home, not to mention if it would have ran the oil out of it riding and locked it up and trashed it. So, after going through all that crap and y'all racking your brains helping me I gotta do all this mess! I'm so not looking forward to it but it must be done! I got a matching set from PSN off a 98 that were in excellent condition and dang near clean as new ones, and 49 bucks! So I'll use those since they're a matching pair then repair the cracked one and have a spare of matching ones, which is always a good thing to have for the when and if.
So, I more than appreciate everyone chiming in and helping out, y'all are awesome!!! I'm going to try and get started on tear down tomorrow and hope to have it out and on the build table and ready to open up and start the transfer. Should I just add pics and everything to this thread or start a new one for all that, what do y'all think? I'll definitely post plenty of pics and progress for everyone since we're all pic junkies LMAO!!! Thanks again guys and I'm sure even though I've done this before and have a manual that I'll end up with a few questions, never fails and let me know y'alls input about keeping it going here or new thread! 😁
Awesome. Glad you got it figured out.


And I would like it if you started a new thread, and put in lots of pics as you go. I'm going to be tearing down a 300 motor (hopefully) in the near future (have to get brakes fixed on my kid's 300, and figure out the noise in the other kid's 350 first) and I'd like to see it as you go.


Since Shadetree rebuilt my kid's 300 motor I still have yet to get into the cases on that specific motor.

2005 Foreman Rubicon Camo
Perfex, 27" Mudbugs
Heated grips and Thumb , HID's
5K Viper Max winch

2009 Foreman 500FM Green
Perfex with HL springs
27" Execs on Rubicon rims
Heated Grips and Thumb, HID's
4K Viper Max winch

2006 Foreman 500FM Green
28" Mugbugs, stretched, Perfex, HLsprings
3K Superwinch winch

2009 475 Rancher AT Tan
26" Mudbugs on Rincon rims
Warn winch. Foreman pod light with HID, SRA gear reduction
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