Honda ATV Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter #1
Hi everyone, I"m new to this site and am looking for some advise.
I'm messing with an '87 Honda TRX 125 and can't seem to get it to accelerate right. When you crack the throttle, it falls on its face. If you ease into it, it runs great. I've had the carb off several times looking for a blockage and everything looks clean and clear. It has a #92 main jet and a #35 slow jet. I've tried the needle setting in every position and it still stalls. It starts and idles real good but it just won't accelerate right.
I've checked the timing chain marks and checked the valves to make sure they had the right clearance.
Any ideas?
Your response is appreciated,
Leroy
 

·
Premium Member
Joined
·
7,533 Posts
The jets need to be cleaned by running something like a torch tip cleaner or a wire from a wire brush through them. They also have little holes on the side of the jet that needs clean. You may want to clean your air filter also. Welcome to the forums.
 

·
Registered
Joined
·
3 Posts
Discussion Starter #3
I cleaned the jets out real good. The smallest torch tip cleaning rod was too big so I used a wire from a wire brush. I forced carb cleaner through it and it's open. There's a new filter in the box. I even tried it with the filter removed.
After reading some info on this site, I wonder if the slow jet might need to be changed, maybe larger. I read where if you have to go more than two turns out from soft seat to get it to run smooth, the jet needs to be bigger. I'm at three or more right now.
 

·
Registered
Joined
·
2,735 Posts
You could be right carbs are a pain.Welcome to the forums.
 

·
Super Moderator
Joined
·
38,518 Posts
I cleaned the jets out real good. The smallest torch tip cleaning rod was too big so I used a wire from a wire brush. I forced carb cleaner through it and it's open. There's a new filter in the box. I even tried it with the filter removed.
After reading some info on this site, I wonder if the slow jet might need to be changed, maybe larger. I read where if you have to go more than two turns out from soft seat to get it to run smooth, the jet needs to be bigger. I'm at three or more right now.
yeah..some carbs can be simple..other's wanna make you pull your hair out !..lol..been there alot..done that alot !...seeing how this is a old bike..your best bet is to get a rebuild carb kit..and just over haul the carb from scratch..what may look good to you..and your eye's..maybe bad for the engine...when you take the pilot/fuel/air jet out..to put the knew one in..make sure you remove the very tiny o-ring thats in the bottom of that jet orfice..,,it's really small..and very tough to get out sometimes..this little 0-ring is very important for air/fuel mixture !..after you get the carb all cleaned up....if you have a air compresser..blow the carb out really good..every nook and cranny..where ever there is a hole..blow it out..re-install all the jets....now..before you put the carb back on...check your intake boot...make sure there isn't any holes/cracks/leaks...this will cause you big problems if there is !!!..if that check out..assemble the carb back on the bike...oh..the long jet needle..put the c-clip on the center grove....that little brass needle seat you see in the bottom of the carb..where the long throat needle goes down into...when you got the main jet out...from the top of carb..tap it down and out from the bottom of the carb..be very careful not to wedge it in as your tapping it out..if you get it wedged..it's gonna be a pain to get out..i always use a small philips to tap it out..put the new needle seat back in right after you take the old one out..so you wont forget it !..lol.make sure you face it the right way..the tappered edge faces up..anyway..put it back on the bike..hook the choke cable back up..make sure the choke cable is working right before you install the air breather tube.after it's all back together....before you hook the fuel line up to carb..turn the gas on..make sure your gas is flowing from the tank..if so...turn your gas back off..hook the line to carb..turn gas back on..if your float is working right..you shouldn't see any over flow comming from the carb..if you don't..choke it..and crank it up..see how it runs..good luck !
 

·
Registered
Joined
·
1,961 Posts
^^^^^^^^ glad shadetree typed all that and not me!.....lol Welcome to the forums!
 

·
Premium Member
Joined
·
23,581 Posts
^^^^^^^^ glad shadetree typed all that and not me!.....lol Welcome to the forums!
Yeah, Shadetree likes to type a lot, I like to post pictures. LMAO.
 

·
Premium Member
Joined
·
23,581 Posts
Helmut are you following me? LOL
It seems like it, don't it? I always click on "Active Topics", so when you reply it puts the thread at the top of the list, so I just keep clicking on the top one. LOL. Congratulations on making the "Top Ten Posters List".
 

·
Registered
Joined
·
2,702 Posts
Helmut are you following me? LOL
It seems like it, don't it? I always click on "Active Topics", so when you reply it puts the thread at the top of the list, so I just keep clicking on the top one. LOL. Congratulations on making the "Top Ten Posters List".

LOL Yeah I figured thats what was happening, and Thanks! I worked really hard at that! Mostly in the internet oddities, and demotivational poster threads LOL
 

·
Registered
Joined
·
1 Posts
Hi im new here to
I have a 1987 Honda TRX 125 also and my problem is it will start but i have to have the choke fully closed, i can can ride it down the road like that but theirs not much power to it, if i open the choke then it just backfires and dies, i cleaned the carb and its very clean and looks new
i checked the timing and that seems to be dead on, im just wondering why i have to have it choked and is that the reason for the power loss?
 

·
Premium Member
Joined
·
11,311 Posts
Hi im new here to
I have a 1987 Honda TRX 125 also and my problem is it will start but i have to have the choke fully closed, i can can ride it down the road like that but theirs not much power to it, if i open the choke then it just backfires and dies, i cleaned the carb and its very clean and looks new
i checked the timing and that seems to be dead on, im just wondering why i have to have it choked and is that the reason for the power loss?
Welcome to da forums...:icon_ devil: Anytime you HAVE to have the choke on to make an engine run,or to keep it running the pilot jetting circuit is dirty,or clogged,and the carb needs a thorough deep cleaning,and possibly a rebuild kit installed if the gasket,o rings,needle,and such are worn out,dry rotted,broken,missing,etc...
 
1 - 14 of 14 Posts
Top