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Discussion in 'Thumpers' started by creeper, Oct 8, 2004.
Does this sound like bad clearance of valves to you guys?
Sound does not disappear on higher rpms.
i think it sounds more like bearing.
but check the valve clearance first anyway as its probably the simplest thing to do at this stage anyway.
then you might want to take the rocker cover off and inspect rocker arm bearings and other components while there
also does it sound the same when in gear and during riding ?
can you tell if the sound coming from the top of the engine or clutch side ? it could be cllutch too.
also post it to 640 Index thread, there will be more people looking at it.
and post more details about the bike what Year, how many KMs etc.
That sounds like something other than valve lash to me.
It's after rebuilt of broken cam chain, sprocket change etc.
can it be the cam chain slapping inside ?
have you checked the chain tensioner
Cam chain is tensioned and in place.
Just did my valves - mileage approaching 30k:
intake valves were a tight 5; exhaust were more than a loose 7 - probably 0.008 (dang I just realized I should have checked with the other end of the feeler gauge... dork). I adjusted the exhaust valves to at least a loose 7; really hate claiming I nailed the 6. I left the intakes at tight 5s. The bike fired up like it appreciated the attention - just my imagination or do slightly loose exhaust valves play that much of a role?
So I did mine the other day! Sad to say I didn't follow this guide and for sure I did it wrong! As I know have a very tappety engine. So that was 3hrs of my life wasted, owell practice makes perfect lol
Now iv read this guide hopefully I won't get it wrong.
Make sure engine is in the right TDC, piston can be at the top twice, but only at one place it is correct . To be sure you are in TDC Lock the cranshaft with cranshaft locking bolt or view trough the sign glass for the little mark on the flywheel, which indicates TDC. I never like the straw method, but what Ive mentioned always worked for me.
I was following the directions for inspecting the valves. When I got to the part about using a soda straw in the spark plug hole to find TDC I didn't have a straw handy so I used a pencil because I had one in my pocket. As I spun the rear wheel the pencil rose up in the hole as expected. I pulled the pencil out and found that the erasure and metal retainer had snapped off the end of the pencil and fallen into the engine. I tried using a strong vacuum to pull it out but to no avail. Anyone have any bright ideas for getting it out? I thought of a magnet but the metal part of the pencil is aluminum. I have to laugh because it's so ridiculous.
Bore scope with a claw? That would get the big piece. Then a vacuum necked down to a fuel line to get the small debris. You will probably want to turn the wheel backward so the piston drops to give you room to work.
put a big wad of chewed bubble gum on the end of a telescoping magnet retrieval tool.
make sure its well attached so you don't have two things in there...
I've read at least 3 accounts of people breaking off pencils in their cylinder on this website. I've also done it myself, but IIRC it was just a bit of lead and wood so I just left it in there assuming it would burn up and blow away.
I have been lurking here for a while and wanna thank you all for awesome tips and trick regarding our bikes. let me thank with this insignificant item, a printable "handle" for feeler gauge. If you have an access to a 3D printer, it is printed in less than 10 minutes. Thanks once again, enjoy