1977 atc90 help!!!

[Kevin Hoettel]

im new to this site and new to 3 wheelers, my neighbor just gave me his 1977 atc90 it sat for at least 15years. i took the carb off and it was gunked up really bad and couldn't be cleaned, so i bought a new 1 on eBay but its not the same it fits good but the chokes on the wrong side. I cleaned the top-end sandblasting and honing and new gaskets. i think the timings right but kinda a lil confused on the subject. so here's the problem i got it to start easy and idles good, but when i give it gas it kinda like boggs and goes good boggs and goes good. is this carb problems or my timing? do i need smaller jets or adjust the needle?

[86trizinger]

Is the side of your tank all rusty>?

[skypilot]

Let's see pics!

[Vealmonkey]

You didn't mention it, but I would make sure I have a honda shop manual for the 90 first. You should be able to download one for free off the internet. It will explain how to time the engine and set your valve clearances and important things like that. I would start at that point first, set your timing and valve clearances and to check your points and make sure the faces of the points are nice and flat, filed flat and to make sure your points gap is set correctly. Start there and make sure all the basics are right before you go and try to trouble shoot other things that may not be the problem. Welcome to the site, by the way.

[MonroeMike]

Welcome to the site and congrats on your first three wheeler.

http://72.52.143.80/~trikes/Manuals/ATC%20manuals/ATC90_Shop_Manual_73-78_ATC110_79-81.pdf

[Kevin Hoettel]

i already have the manual, the only couple things i don't really now for timing are, is the t suppose to be aligned with the index mark, the way it looks in the manual its not suppose to be. but if i understand right the f should be aligned with the index mark and it will be t.d.c. then aline the cam bolts with the notch in the head. i have good spark and it starts first pull cold. it seems as if some gas is coming out the intake of the carb, so i think i have to check the jet size. and ill take pics tomorrow its to dark now.

[Kevin Hoettel]

o ya and the tanks kinda rust?

[Kevin Hoettel]

http://i815.photobucket.com/albums/zz80/Kevin_Hoettel/1202001821.jpghttp://i815.photobucket.com/albums/zz80/Kevin_Hoettel/1202001820a.jpghttp://i815.photobucket.com/albums/zz80/Kevin_Hoettel/1202001820.jpg

[ratvespa]

if your timing was off it would not idle. It sounds more like a carb problem, can you confirm the jetting is the same on the new carb as it is on a old carb? also, if it's bogging right off of idle I would guess a idle mix problem.

[atc350xer]

Wow... never saw forks that bent before

[Kevin Hoettel]

the carb i got off ebay, i took it off and none of the jets are labeled(fml) and i went to 4 local shops and no one carries the jets for it. so i decided to go back to the original carb but i need to use an easy out to get the idle jet out and new floats. so im going to buy a carb rebuild kit, but im broke till thursday so its gunna take a while for i get another stab at it. and i need new rear rim o rings and new tires i found maxxis razor hole shots on sale for 50 so i think im gunna buy them.

[Vealmonkey]

I think you better worry about the front forks before you worry about the rims. Also with those ebay carbs, you can sort of judge your jetting by measuring with some drill bits. I know, but at least it gives you an idea if your jetting is larger or smaller than what you started with. An if you have to go larger, you just go to the next larger drill bit size and drill out by hand. It's handy to have one of those large, smaller drill bit sets though. And you realize unless you do some soldering or brazing that you can't really go back in jet sizes, so you have to make sure all your tune up stuff is properly working and spot on first and you have to progress super slowly. Make sure all your gaskets on your intake and carb are present and in decent shape. Sucking air in your intake will really screw up your carb tuning and performance. Also, even though it's not near as critical on a 4 stroke as it is on a 2 stroke, make sure you have a decent and clean air filter.

[Mr_RPM]

I was able to order rim o-rings from my dealer from honda still just last week....Dr. atv.com also has them. (beatrice cycle)

get new forks off of ebay, they are cheap last i checked

[Kevin Hoettel]

the tire dosent touch the motor so the forks are fine for now, i just wanna get it going first, and u can buy smaller jets i just cant find them for that carb u dont have to add then drill. if i get a aftermarket filter do i have to use the connecting tube.

[Mr_RPM]

u can get a clamp on UNI pod filter. I have one

[Kevin Hoettel]

ok so go bought new fuel lines, fuel filters, steering stem bearings and a num65 main jet. still no luck i readjusted the needle and nothing, also does it matter the pipe is off and there is not air filter yet. i tried to advance and retard the ignition and still no luck u am so lost. what should i check out? i just got feeler gauges and have to check the point gap. but i need ideas

[swifty]

buy a new set of points and gap them correctly ive had so many atc 90's act stupid and bog like that and i rebuilt carbs switched carbs so many times to get no where come to find out it was the points ive had little luck with just cleaning them just buy a new set for $9 bucks, i think the spark just craps out or is weak and dosent burn the fuel and gives the you the bog, acts just like a carb problem ive even had it get better or worse with using the choke to trick me even more into thinking it was the carb,,,,,,, thats been my expericence hope it helps

[Kevin Hoettel]

ok ill try that, and swifty your bike is sweet as hell love the drag tires and suicide shift

[swifty]

thanks man its something diffrent, its a old flatrack frame looks stupid ass hell with rear fenders so i had them off and was like this thing looks fast!! added the solo seat and hoosier rear tires and instant custom atc 90! i ride it on the street only and the shifter is so top heavy it swithch gears on its own when u shift from rocking back and forth! lol

[Jeepermc]

I had bent forks too....Not that bad but still to the point where the fender rubbed the head. I chained the back to my truck (as close to the inside of the axle as I could get on both sides) and then used two come-alongs(one to each side of the front axle) to the back of my sisters car and started cranking each one evenly till the forks were straight. All you need is two stationary objects and something to pull the forks evenly. Make sure all your hook points and equipment are in good shape.

If it doesn't work you aren't out anything and still have to pick up some new ones.

[Kevin Hoettel]

i am getting so sick of this p.o.s. atc, i got new points and condenser went threw all the wiring and a lot was chewed up so i fixed everything taped it all up nice. and now i have no spark. i am so fed up with this thing o and then the throttle cable snapped so i have to order another 1

[Kevin Hoettel]

if anyone is still following this i just got it running good i think.(DUE TO SWIFTYS ADVICE) ill know for sure once i get my chain,throttle cable, and new rim orings in the mail.but from what i can tell its good, now excited to ride

[Jeepermc]

Good deal! Congrats Man!

[swifty]

glad my advice worked it only took me about 10 yrs of tinkering to figure out this trick, wish someone had told me it when i first started wrenching on 90's

[Brian Lilb Keen]

nice trike i have a 78 Atc 90 i would get smaller tires in the back mine doesnt like to go in high with the big ones but nice trike good luck to u!

[Kevin Hoettel]

nice trike i have a 78 Atc 90 i would get smaller tires in the back mine doesnt like to go in high with the big ones but nice trike good luck to u!

lol, just picked up 2 maxxis razors on beatrice.com for 100 they r 22/11/8