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.

LinkBack Thread Tools Display Modes
Old 12-12-2010, 09:31 PM   #1 (permalink)
Junior Member
tomvito's Avatar
Member #7390
Join Date: Dec 2010
View tomvito's Photo Gallery(0)
Posts: 22
2002 300ex timing chain question

I bought a used 2002 300ex for my son. He has been unable to ride as of yet due to some repairs that need done. After completing all repair we got it running, and it seems to run great, right up until the time you shut it off. It seems every time you shut it down the timing chain jumps off the sprocket. The tensioner is out the whole way, and the chain "seems" tight, but not sure how tight it should be. I'm more of an auto mechanic. I'm thinking the chain is just stretched to the point that it is jumping, but also thinking maybe the tensioner is weak.

I was wondering if anyone else has had this problem or seen this before with a 300ex.

Any and all help is greatly appreciated.

Thank you,

tomvito is offline   Reply With Quote is the premier Honda ATV Forum on the internet. Registered Users do not see these ads, so Register - It's Free!
Old 12-12-2010, 09:45 PM   #2 (permalink)
Super Moderator
Supporting Member
TRX2fiveO's Avatar
Member #417
Join Date: Jun 2009
Location: East coast North Carolina
View TRX2fiveO's Photo Gallery(0)
Posts: 16,637
Liked: 87 times
Welcome to the forums... I would say you are on the right track the chain may be stretched How do you put the chain back on? do you take the rocker cover off and put it back on? How did the cam bearings feel? any slack and it would cause the cam to wobble a little throwing the chain. your guides may also be worn too along with the tensioner
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)

Progress and Help
TRX2fiveO is offline   Reply With Quote
Old 12-12-2010, 09:54 PM   #3 (permalink)
Super Moderator
Supporting Member
Helmut's Avatar
Member #948
Join Date: Oct 2009
View Helmut's Photo Gallery(0)
Posts: 23,815
Liked: 12 times
Welcome to the forums. If the tensioner arm is coming all the way out as far as it will go, the chain is stretched.
Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Helmut is offline   Reply With Quote
Old 12-13-2010, 06:32 PM   #4 (permalink)
Junior Member
tomvito's Avatar
Member #7390
Join Date: Dec 2010
View tomvito's Photo Gallery(0)
Posts: 22
Thanks guys. Too put the chain on, Ive been removing the cam, placing the crank on the "T" timing mark, getting the chain on the crank sprocket, the installing the cam, followed by reinstalling the tensioner. The bearings feel fine, imo. So I guess I'm going to order a new chain, and possibly a new tensioner. I really havent looked much at the guides themselves, as I never really thought of them being worn.
tomvito is offline   Reply With Quote

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

Search tags for this page
2002 honda 300 2x4 timing chain
2003 honda 300ex setting timing
300ex timing

300ex timing chain

300ex timing marks
honda 300ex timing

honda 300ex timing chain

honda 300ex timing chain how to tell if its stretched
honda 300ex timing chain replacement
how to adjust the timing chain on a 300ex
how to change 300ex timing chain
why does the timing chain, keep coming off on a 300ex honda four wheeler
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

Powered by vBadvanced CMPS v3.2.1
All times are GMT -6. The time now is 11:38 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.