Honda ATV Forum
Go Back   Honda ATV Forum > Honda ATV Technical Discussions > Repair & Maintenance

Repair & Maintenance Having problems? Doing a rebuild? All Repair/Maintenance Discussions here.

Reply
 
LinkBack Thread Tools Display Modes
Old 03-12-2010, 07:24 PM   #1 (permalink)
Junior Member
 
boyfriday13's Avatar
 
Member #2142
Join Date: Feb 2010
Location: Fountain Valley, CA
View boyfriday13's Photo Gallery(0)
Posts: 11
ATC 70 Fix 'em up

Well, I got started and got some great help in the New Member forum so I thought it was time to move over to the R&M forum.

I have an '85 ATC 70 stock that's been sitting for a long time. Previously, the tank had rust and I used the PRO-15 kit on it. I pulled the carb and cleaned all. I have a carb re-build kit but I think the carb has all new stuff from before. Anyway, I cleaned it up good put it back together, checked the air filter. Checked spark and it looks good so I fired it up. It started and sounded fine, so I started to adjust the idle screw. After the engine warmed up some and while I was trying to dial in the carb, it quit and I wasn't able to get it to start again. I pulled the carb again and re-checked/cleaned the main and slow jets. Also re-checked the screen filter as it had a bunch of rust/dirt from before. I put a new plug in today and cranked it over with no luck. I adjusted the air/mix screw most of the way in and adjusted the idle screw all the way in and tried again. I got it to start and then it ran for awhile but was missing/sputtering when I rev it. Played with the air/mix screw a bit and then after it warmed up it quit again. Seems like it's getting gas, so I'm now thinking I should check the timing? Any ideas on if it's carb/gas related or a possible timing issue?
boyfriday13 is offline   Reply With Quote
HondaATVForums.net is the premier Honda ATV Forum on the internet. Registered Users do not see these ads, so Register - It's Free!
Old 03-12-2010, 09:16 PM   #2 (permalink)
Senior Member
 
Billy250X's Avatar
 
Member #1088
Join Date: Nov 2009
Location: Imler PA
View Billy250X's Photo Gallery(0)
Posts: 2,749
It's running out of gas.Maybe it needs jetted.
__________________
Billy

1991 Trx250X Custom exhaust,K&N jetted,widened 7.5 inches in the back and 8 inches in the frontWarrior rear shock and z400 front shocks with custom brackets.Race cut fenders.+3 swingarm.Way more to come.
Building things makes me happy.
Billy250X is offline   Reply With Quote
Old 03-12-2010, 09:50 PM   #3 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,525
Liked: 120 times
yup..sounds like float is sticking..not letting enough gas in the carb..with the carb off..take the bowl off the bottom of the carb..hook the gas line from the tank back up to the carb..while you hold the float in the up position..slowly lower the float...as you do..gas should flow out..if it doesn't..then you got a restriction from your tank to your carb or float needle needs to be replaced or cleaned really good..after that checks out ok..re-clean your jets again..i know you said they were clean..but..if you get any..and i mean any small stuff inside the jets..it will stop them up..no matter how many times you clean them..it's a very good idea to have a inline fuel filter..spec a new one. hope this helps..keep us posted.
shadetree is offline   Reply With Quote
Old 03-13-2010, 09:40 AM   #4 (permalink)
Junior Member
 
boyfriday13's Avatar
 
Member #2142
Join Date: Feb 2010
Location: Fountain Valley, CA
View boyfriday13's Photo Gallery(0)
Posts: 11
Ok, thanks guys! I'll get on it and post back. One idea I had is that when I lined the tank I didn't plug the "out" tubes, I only capped them. Earlier I put some water in the tank and checked to see how it flows out through the tube and it came out fine from one and nothing from the other. I stuck a piece of wire into both and was able to run it in fine but I'm not sure if one is reserve and if I should be able to see flow out with a fairly small amount of liquid in the tank? I figure I can always tank the tank off the other bike and test to see if that's the issue.
boyfriday13 is offline   Reply With Quote
Old 03-13-2010, 10:20 AM   #5 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,525
Liked: 120 times
Quote:
Originally Posted by boyfriday13 View Post
Ok, thanks guys! I'll get on it and post back. One idea I had is that when I lined the tank I didn't plug the "out" tubes, I only capped them. Earlier I put some water in the tank and checked to see how it flows out through the tube and it came out fine from one and nothing from the other. I stuck a piece of wire into both and was able to run it in fine but I'm not sure if one is reserve and if I should be able to see flow out with a fairly small amount of liquid in the tank? I figure I can always tank the tank off the other bike and test to see if that's the issue.
you just solved your own riddle..your bike is running out of gas..because it's set on reserve..which means..there isn't any gas flowing through that one tube going to your carb..if any at all..it's not enough..clean the lines out from your tank really good..check to make sure your getting gas from both tubes going to the carb when you switch the pet-cock from on to reserve..this should fix your prob.
shadetree is offline   Reply With Quote
Old 03-13-2010, 08:54 PM   #6 (permalink)
Junior Member
 
boyfriday13's Avatar
 
Member #2142
Join Date: Feb 2010
Location: Fountain Valley, CA
View boyfriday13's Photo Gallery(0)
Posts: 11
Here's the update: Put the new plastic tank from the other bike on, tried to start it with no luck. Pulled the carb and tried to follow Shadetree's suggestion for testing flow but I wasn't sure how to check it since the gas line connections come off with the bowl. Anyway, I had purchased a rebuild kit from DRATV some time ago so I went through the entire carb again. I put in new parts if I had them and cleaned everything again. Put it all back together and after a fair number of pulls it started. I was able to see results from adjusting the idle and played with the air/mix screw a bit. Starts right up now, idles fine and keeps running well even after it warms up. It was definitely a gas issue and may have been a combination of the fuel tank out lines being restricted and there still being some junk in the carb. Only thing I notice now is it's a little sluggish (slow response) if I rev it full. It hesitates or sputters just a little before opening all the way up. Seems like it's not all the time, just if it's been idling for a bit. Lastly, I put the old tank on my other 70 and it sure has a flow restriction. The other bike will stay idling but is definitely not getting enough fuel. Any tips on cleaning out these tank output tubes that have been lined with PRO-15? Or is it a lost cause...
boyfriday13 is offline   Reply With Quote
Old 03-13-2010, 09:32 PM   #7 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,525
Liked: 120 times
first thing i would do.is replace both fuel lines from tank to carb with new ones, second..put a inline fuel fliter on both lines leading to the carb, and if your bike is not rev'ing right..means your main jet is stoped up..or your main jet needle needs to be lowered..it's flooding the engine...take the top off the carb..push the throttle cable out from under the throat piston..then push the main jet needle out..on the main jet needle..where the c-clip is..move it up one notch..also ..your air/fuel mixture still could be out of wack..adjust the main jet needle before you play with the screw...oh...you may want to clean the points on the engine..remove the left upper side cover < two screws i think >..with a 10 mm socket..break the bolt loose..remove the point cam, with some fine sand paper..sand the points down alittle..watch how you take this off..it only goes back on one way..it's got a small tiny pin that lines up with the cam...if after you get all this done..you may also want to adjust the points..easy to do..there are two screws where your points are..they hold the point pick up down..loosen them a little..start your bike..while you rev it up..move this metal ring one way or the other..this adjust your timming..it may help with the rev part..hope this helps.
shadetree is offline   Reply With Quote
Old 03-14-2010, 10:55 AM   #8 (permalink)
Junior Member
 
boyfriday13's Avatar
 
Member #2142
Join Date: Feb 2010
Location: Fountain Valley, CA
View boyfriday13's Photo Gallery(0)
Posts: 11
Thanks very much! I think I'll do each of these, probably in order. I had replaced the needle and c-clip yesterday and put the clip the same as the old one on the 4th notch. Easy to change and test...I know there's some sand and maybe some dirt/corrosion in behind the magneto but I need a puller before I take this off and clean. Great tips, I can't thank you enough!!
boyfriday13 is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Honda ATV Forum > Honda ATV Technical Discussions > Repair & Maintenance


Search tags for this page
atc 70
,

atc 70 forum

,
atc 70 fuel line
,
atc 70 points
,
atc 70 points gap
,
atc 70 stuck float
,
carburator specs for honda atc 70
,
honda atc 70 carburetor rebuild kit
,
honda atc 70 forum
,
honda atc 70 troubleshooting
,
how to clean points on honda atc 70
,
trx70 petcock issue
Click on a term to search our sites for related topics.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


» Discount Tire
Motosport.com


Powered by vBadvanced CMPS v3.2.1
All times are GMT -6. The time now is 07:34 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.