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Mechanical and Technical Mechanical and technical topics, help, and discussions

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Aug 3rd 2018, 09:30 AM   #1
 
  Aug 2018
  Oregon

valve noise

i have a problem with valve noise. i will keep this short and post more later, but for some reason when i write out my problem, my posts are not being approved.

i have valve noise on my suzuki GN125.

any help will be appreciated. details to follow.
Aug 3rd 2018, 09:34 AM   #2
 
  Aug 2018
  Oregon

i have adjusted the cam tensioner. i have removed it and checked for plunger sticking. it is functioning properly. the top end valve chatter is at any rpms. I have set the valve lash 3 times making sure i have set it properly and still there is a lot of valve clatter. i am wondering perhaps if the camshaft bearing surfaces have been worn, but would it really create a lot of valve clatter? any other suggestions of what to check or try?

suzuki gn 125

i inherited this bike so i do not know the history well. also i am having a high rpm issue at idle, they could be related. but my post covering both issues is not being posted. i will try to post it separately (again) as i am doing here by keeping the original post small.
Aug 4th 2018, 10:14 AM   #3
 Parilla125's Avatar
 
  Jan 2016
  SeaTac

Are you sure it is not a 'normal' noisy valve train? I am not familiar with these but some bikes are just noisy. The old Triumph's were noisy due to very light and thin valve covers. A few of mine have been pretty noisy. Noisy. There. I said it again.
High idle is probably a different issue.
Aug 4th 2018, 04:55 PM   #4
 
  Aug 2018
  Oregon

well heck. maybe you're right. its quite a rattle, but ya know, i've heard that BMWs even rattle quite a bit. at this point i gotta wonder if it's just normal for these.
Aug 4th 2018, 05:34 PM   #5
 MMcN49's Avatar
 
  Jan 2016
  Small Island Surrounded by Puget Sound

  07 Buell XB12STT, (Two) 12 Suzuki DR650 SE 72BMWR75/5 KIA @ 243K
Even engine oil can have an effect. My Buell clattered like hell on Mobile-1. On the Buell forums I learned this was a known issue with Mobile-1.

IMO you should concentrate on one issue and I think that would be the carb and high idle.
Sentinel likes this.
Aug 4th 2018, 10:03 PM   #6
 
  Aug 2018
  Oregon

i just inherited it. i don't know if it uses oil.
Aug 6th 2018, 07:31 AM   #7
 
  Aug 2018
  Oregon

Quote:
Originally Posted by Sentinel
well, if you're confident the valves are in-spec, and if you have adequate oil, and if it starts and runs OK - the problem is what?
so much rattling from the top end. did you read the original post?

oh ya... my bike is running so perfect, so i just thought i'd post a question here and have people tell me to adjust the valve lash and change the oil. geezus.

at this point i am thinking it is play in the camshaft. loose journals. I was hoping (as my original question stated) that someone who has experienced this AND corrected it, could tell me their experience and what they did to correct it.

Edited by Ford on Aug 6th 2018 at 07:33 AM
Aug 6th 2018, 08:35 AM   #8
 ChopperDr's Avatar
 
  Jan 2016
  Buckley

  '98 HD FXD, '03 SV650 track
A simple observation. The common denominator with the problems your bike is having is you.

Just because you cleaned the carb does not mean it is clean. You adjusted the valves, are they to spec or to your spec?

Your reality may not be reality.

Hoping this will not bunch your panties up, speaking from experience.

Chop
Aug 6th 2018, 09:41 AM   #9
 Parilla125's Avatar
 
  Jan 2016
  SeaTac

A quick search on line shows that damaged rockers and piston slap 'can' be a problem on these. I would presume the rocker issue is running WFO most of the time with the rockers not adjusted. Any air cooled engine will have a wider range of piston clearances due to the nature of the beast. My TW200 is noisy and I bought it new. The fins on an aircooled engine (radiate sound) can make them sound worse than they are.
You did not mention year or miles. You have no idea how it has been treated. It really sounds like you have covered the bases and it is still noisy. From my reading it seems many are noisy and this complaint is common even on brand new ones.
Valves are adjusted, cam chain is set. Ride it and check the valves and chain in a couple hundred miles. Look for metal in the oil. All good? Go ride.
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