DEAR SIRS, I HEAR A RAW NOISE COMMING FROM THE CAM AREA AT LOW RPM, WHEN I RAISE THE RPMS IT DISAPPEARS.
i WANT TO DISMANTLE THE HEAD TO SEE WHAT IS HAPPENING WITH THE CAM OR VALVES.
MY BIKE HAS ONLY 20.000 KMS.
iTS A YAMAHA CRUX 110.CC
CAN YOU HELP ME WITH A REPAIR MANUAL FOR DOWNLOAD IT,? or a little help.
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Hi Thinbluegato, remove air cleaner and backing plate, spray some starting fluid or Brake Kleen at intake manifold to head area and intake manifold to carburator area when engine is cold. If RPMS increase then you have an intake leak and repair as necessary. If you have a carburator your idle adjusting screw is in too far or your air fuel mixture is too lean or your fast idle cam on choke could be faulty. If you are injected please visit website below:
if its valve chatter you will hear it just under the valve cover pretty pronounced, but usually valve chatter gets quieter as the bike warms up, you might look into your cam chain adjuster those get loud and chatty at higher rpms.
Have you checked the tension on the primary chain lately? Take the oval shaped inspection cover off the the primary cover on the right side of the bike. Check the tension on the top run of the primary chain in the middle of the run. You should have between 5/8" (15.8mm) to 7/8" (19.0mm) with the engine COLD. To adjust loosen the nut that holds the primary chain shoe in place and raise the plate to tighten the chain, lower it to loosen. Since working through the inspection cover hole is tedious, some people elect to take the outer primary cover off and then set the tension. Refill the primay with 36 to 42 ounces of the appropiate oil. Harly uses H-D Syn3 20W50 synthetic engine oil in the primary.
If the noise seems to be coming from the right hand side of the engine, it could be the cam chain tensioner and shoe. To repair this requires going into the cam chest. This is something that I do not recommend for the amateur mechanic. There are also some special tools required to work in this area.
Depends. You will get some valve noise as the bike gets older, however, this noise is only noticable at Idle. If you are getting a loud enough noise at crouse speed to the point of being annoying then the chances are you have a lifter that is starting to collapse. This is upper end noise only. If you are getting a lower end noise and have at least 30,000 miles on the bike. Chances are the valve drive chain tensioners are going. This is a known problem with twin cam engines. I have two twin cams and had to replace the tensioners on both. My advice to you if this is the problem is to go to Gear Drive cams. I did it without any regrets. I have a quicker power response and was able to increase my rev. limit speed by almost 200 rpms. The down side according to some is a wining noise. I don't get any noise I can hear over my Python 3 pipes. In my opinion the benefits out weigh the noise. Without having the bike in front of me this is the best I can suggest.