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Post by GraveSite on Sept 10, 2007 15:16:21 GMT -5
Hey All. I came about this 1978 SR500 Yamy i say, Cause its Yamming my leg for start. After dong Maintenance as carb & Tank Clean, Lubed frozen cables And have Spark! Etc. Plug gets feul & assisted with Starter fluid but nothing fired. ----I am wondering it seems i hear compression like noise from end oil breather. I havent check timing or anything yet but i am still getting spark.
At 1st i thought was just the intake suction noise. I know the oil pump is working. I do get some pressure with my finger in the plug hole (fun pump on that) Any suggestion? I hate to pull the head when it might be something else. I figure even with low compression it should try to start.. Or compression is going in gear case somehow.- No dont have a compression gauge.
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Post by wotavidone on Sept 10, 2007 17:20:42 GMT -5
I would be more worried if you could not hear a chuffing like noise from the crankcase breather. The piston has to push 500cc of air out of that breather every down stroke, and suck it back in every up stroke.
Check decomp lever adjusted properly? Have you got your starting technique worked out?
Mick
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Post by colinjay on Sept 10, 2007 17:31:37 GMT -5
As Mick, says, the chuffing noise from the breather is normal.
Engines that have stood for a while will quite often feel low on compression (due to valves not sealing properly, stuck piston rings etc). If you can round up a few mates, try a long push start session and really get the engine spinning over and it should start. Once running and warmed up, you should be able to get a better idea of how worn the engine is by how much smoke it blows, if it doesn't blow any then things are probably ok. I have seen 500 engine blowing more smoke than an old two stroke and they still ran ok when ridden.
CJ
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Post by GraveSite on Sept 11, 2007 0:02:51 GMT -5
Yes, good description ( it is chuffing ) Do you really have to do that start up song & dance as in a video link i watched. I figure turn on the gas, ignition & begin yamin on the kick starter Minus not to throttle as seems prong to flood the plug. It has been sitting the last 12 years & guy who had bike said no compression, which i get some. I did not see any decompression cable adjustment. another guy said the piston may have a hole in it ( sound of chufulling ) ill let you know how it turns out once reinvesticate the decompressor & make shure timing seems in bounds to a push start method...
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Post by GraveSite on Sept 11, 2007 0:08:58 GMT -5
Oh forget to mention The milage on the thing is 18,000 miles.
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Post by milkman on Sept 11, 2007 7:47:10 GMT -5
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Post by GraveSite on Sept 11, 2007 14:47:59 GMT -5
 It's Alive! & loud! I added a grounding wire from - terminal to chassis which seemed a difference.THe blue smoking was there till warmed up & slowly decreased. It's really sensitive to quick throttle after start but needs it to start it. Also the exhust pipe seemed to blue at head curve. I have the mixture set at two turns. Whats the best method to set this? Its all still stock. THANKS, The Forum had helped....P.S i do get some back fire popping. Engine has no weird or tapping noises but good vibrations..
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Post by milkman on Sept 12, 2007 7:22:43 GMT -5
sounds like yours sounds like mine......good work
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Post by wizz954 on Sept 12, 2007 10:15:06 GMT -5
Well done on getting her going. Check you don't have a leaking exhaust gasket, that can cause banging and popping, especially when you shut the throttle.
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Post by GraveSite on Sept 12, 2007 19:38:53 GMT -5
I get like flame roll out still combustible loaded to tail pipe. Starts better in 10 or less kicks with the carb vacuum to gas cock valve. Funky machine.
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Post by GraveSite on Sept 24, 2007 21:51:56 GMT -5
OK heres probably a dumb question. When taking off the cover to check timing Etc. will you have to drain the oil? Or is there oil there?
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Post by wotavidone on Sept 24, 2007 23:52:26 GMT -5
To check the ignition timing and position the engine on TDC on the compression stroke to check valve clearances and adjust the timing chain, you will need to remove the lefthand side cover to expose the flywheel and the timing indicator on the left hand crankcase. There is not meant to be any oil in this bit. When doing the cam chain adjustment you have to do undo the cover on the adjuster about halfway up the barrel on the rear rightside of the barrel. This will leak a half teaspoon of oil.
Mick
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Post by wotavidone on Sept 24, 2007 23:53:49 GMT -5
How on earth did this filtering system change half a tea spoon full of oil to a half teasthingy?
Who programmed the thing?
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Post by wotavidone on Sept 24, 2007 23:54:30 GMT -5
I don't get what could be objectionable about a spoon.
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Post by miker on Sept 25, 2007 9:05:10 GMT -5
You've never heard of spooning? (Heck, I barely have...)
Probably looking for something like p**ntang.
miker
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It's Alive! & loud! I added a grounding wire from - terminal to chassis which seemed a difference.THe blue smoking was there till warmed up & slowly decreased. It's really sensitive to quick throttle after start but needs it to start it. Also the exhust pipe seemed to blue at head curve. I have the mixture set at two turns. Whats the best method to set this? Its all still stock.
