Top posting users this month
JohnW
 
steve9e
 
Duckrider
 
cor
 
zambiamud
 

Top posting users this week
steve9e
 
zambiamud
 
JohnW
 

Who is online?
In total there are 2 users online :: 0 Registered, 0 Hidden and 2 Guests

None

[ View the whole list ]


Most users ever online was 29 on Tue 30 May - 4:54
Latest topics
» F Reg T80 Townmate
Today at 8:08 by JohnW

» please add your Location
Mon 13 Aug - 19:08 by zambiamud

» T80 Dales Tales
Mon 13 Aug - 0:03 by steve9e

» Yamaha FS 1 selfmade with 80 cc engine
Wed 1 Aug - 3:28 by cor

» 1996 T80 (P166NRT)
Thu 26 Jul - 8:23 by JohnW

» Genuine new Yamaha crown wheel PART NUMBER: 29F-46110-00
Mon 23 Jul - 2:46 by JohnW

» Yamaha dt125r
Sun 22 Jul - 2:14 by Duckrider

» gear change
Sun 22 Jul - 2:08 by Duckrider

» T80 new purchase
Sat 21 Jul - 11:18 by Oldman


Cam chain rattle

Go down

Cam chain rattle

Post  sammyt80 on Wed 4 Apr - 9:22

I keep getting a constent rattle from the cam chain when under load and tick over but goes when going down hill, I've changed the spring and locking screw but when took old spring out it was longer than the new one from Yamaha and fear the chain has stretched.

Is a replacement a big job

The mileage is 13,800 or so and running 20w/50

sammyt80

Posts : 8
Join date : 2012-03-14

View user profile

Back to top Go down

Re: Cam chain rattle

Post  JohnW on Thu 5 Apr - 4:03

The chain needs to be slack when you adjust it, (ie no load on it from camshaft, do it at top dead centre with both valves closed, it also helps if you push the spring & tensioner plunger in with you finger. When you have tightened up the locking screw check to see if its tensioned up, ie no stack on cam sprocket. If the chain is tight then the rattle must be from somewhere else. Strange it goes off when going down hill. Chain should not need changing after only 13800 miles


Last edited by JohnW on Thu 5 Apr - 4:06; edited 3 times in total (Reason for editing : Text added)

JohnW

Posts : 1146
Join date : 2011-10-29

View user profile

Back to top Go down

Re: Cam chain rattle

Post  sammyt80 on Thu 5 Apr - 7:19

Keep getting different ways of adjusting the chain and no luck so far, I've adjusted it before with the chain tight and seen the chain when rotating go tight than slack again.

So
1) tdc compression stroke
2) adjust it when slack
3) push plunger and spring in with finger

Does the lock screw need fitting tight

sammyt80

Posts : 8
Join date : 2012-03-14

View user profile

Back to top Go down

Re: Cam chain rattle

Post  JohnW on Thu 5 Apr - 8:13

sammyt80 wrote:Keep getting different ways of adjusting the chain and no luck so far, I've adjusted it before with the chain tight and seen the chain when rotating go tight than slack again.

So
1) tdc compression stroke
2) adjust it when slack
3) push plunger and spring in with finger

Does the lock screw need fitting tight

Tighten the locking screw with cross head (Philips) screwdriver whilst pushing in the plunger. Dont forget to do up lock nut. If this does not cure the problem its not the cam chain. Without hearing the noise its hard to diagnose. Sorry cant help further.

JohnW

Posts : 1146
Join date : 2011-10-29

View user profile

Back to top Go down

Re: Cam chain rattle

Post  sammyt80 on Thu 5 Apr - 8:25

Thanks will have a try tomorrow if weather gets nicer, going to change oil as well I've put in 2cylinder 20w/50 in by mistake and thinks its struggling as its very thick and viscous and going to use 10w/40.

sammyt80

Posts : 8
Join date : 2012-03-14

View user profile

Back to top Go down

Re: Cam chain rattle

Post  sammyt80 on Sat 7 Apr - 6:10

Found one cause, the cam chain tensioner lock screw the cylinder where stripped and literally just sat in there Shocked Got it back from garage and told them how to adjust and got it back and still a slight rattle but hay how going to leave for now, think it might need a new chain.

sammyt80

Posts : 8
Join date : 2012-03-14

View user profile

Back to top Go down

Re: Cam chain rattle

Post  Dave Weller on Sat 11 Oct - 4:13

My lock screw is stuck, any tips on moving it, I have an impact driver but don't really want to use it. I could do damage, I was thinking about heating the head area around the screw. The timing chain may have a slight rattle but I'm sure it will run for a while, until my next service on it.
Any ideas, the screw looked like it had never been undone in the past, like everything else on this bike, it has never been touched.
Regards
Dave


Dave Weller

Posts : 24
Join date : 2014-08-25

View user profile

Back to top Go down

Re: Cam chain rattle

Post  JohnW on Sat 11 Oct - 6:00

Dave Weller wrote:My lock screw is stuck, any tips on moving it, I have an impact driver but don't really want to use it. I could do damage, I was thinking about heating the head area around the screw. The timing chain may have a slight rattle but I'm sure it will run for a while, until my next service on it.
Any ideas, the screw looked like it had never been undone in the past, like everything else on this bike, it has never been touched.
Regards
Dave



An impact driver is the only way, but make sure you have a good fitting bit. A bit of heat may help.

JohnW

Posts : 1146
Join date : 2011-10-29

View user profile

Back to top Go down

Re: Cam chain rattle

Post  Dave Weller on Sun 12 Oct - 5:58

Cheers John, I will give it a go, hopefully soon there will be another T80 on the road, it's already legal, I just want to do a bit of preservation work while I've got the back wheel out, I can't find any major rust areas so i'll Kurust it, prime and spray the under frame, and Waxoil it.
Thanks again for your help and this site.
Dave

Dave Weller

Posts : 24
Join date : 2014-08-25

View user profile

Back to top Go down

Re: Cam chain rattle

Post  barker on Tue 14 Oct - 8:34

my cam chain tensioner was seized and the cam chain was making a lot of noise so I got some heat on the screw but be careful shield the surrounding area then gently tap it round don't be I to brutal with it

barker

Posts : 477
Join date : 2011-03-25
Location : littlehampton

View user profile

Back to top Go down

Re: Cam chain rattle

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum