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Post by zooma on May 26, 2015 11:38:40 GMT
If it's all 4 plugs it's more likely the valves?? The bike doesn't smoke when it runs though? Certainly don't think it has owt to do the rings, from what you've already described. Fookin diagnosing problems is almost a black art, just got to go through it all one thing at a time, nice an' slow, checking every stage of the work that ya did on the head. My money's on it being something to do with the valves but what, I don't know.
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Post by captain chaos on May 26, 2015 12:04:26 GMT
Not had it warmed up enough to do a compression test, You mean not at all after the rebuild? Do that first, go for a long ride, then report back.
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Post by p4ddy on May 26, 2015 12:14:16 GMT
I can't get it running well enough to go for even a 10 meter ride. Besides it's not t&t'd and I'm uninsured.
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Post by zooma on May 26, 2015 14:08:20 GMT
P4ddy, after you lapped the valves in, did you turn the head upside down and fill the combustion chambers with some fuel, to check the valves were well seated?. Don't mean to question yer skills fella, just trying to figure out what might have gone wrong
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Post by Devilman on May 26, 2015 14:19:50 GMT
Also I am sure you followed protocol when rebuilding the motor and slapped oil on everything, everywhere (piston skirts, bores, etc..) to ensure enough lubrication during first start-up etc... It could well just be the "excess oil" from the rebuild?
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Post by zooma on May 26, 2015 15:11:16 GMT
Also I am sure you followed protocol when rebuilding the motor and slapped oil on everything, everywhere (piston skirts, bores, etc..) to ensure enough lubrication during first start-up etc... It could well just be the "excess oil" from the rebuild? Yep, so easy to get stressed and miss the obvious... fingers crossed
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Post by p4ddy on May 26, 2015 15:35:26 GMT
I had my old oil pump thing working overdrive coating the bores and pistons. Filled the valve bores with barbecue fluid to check leaks. All was good
Hey I question my skills myself lol
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Post by zooma on May 26, 2015 16:30:57 GMT
Hey I question my skills myself lol Hahaha, you me both mate!. Takes some bottle to do engine work and not everyone's confident enough to give it a go; kudos to you for getting stuck in. I'd certainly work on Devilman's suggestion for now; see if you can lose any excess oil by running the bike, cleaning the plugs and repeating that until the plugs come out clean. If that don't work, then it's back to the drawing board but at least you'll know that the oil used during the top-end rebuild wasn't the cause of yer problem.
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Post by Devilman on May 27, 2015 1:35:33 GMT
Also its worth note, NGK's do NOT seem to like getting fouled...
Once they are a bit wet and fouled up, they seem to just break down and will not spark properly in the motor.
Might be worth trying a diff set if you got any around?
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Post by yoshi on May 27, 2015 20:58:02 GMT
Also its worth note, NGK's do NOT seem to like getting fouled... Once they are a bit wet and fouled up, they seem to just break down and will not spark properly in the motor. Might be worth trying a diff set if you got any around? I have noticed that lately once a plug is fouled that's usually the end of it ,not like when I were a lad a ,cigarette lighter would burn off any oily deposits plus I hear there are a lot of cheap copy NGK,s about which can break down under load yoshi
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Post by Devilman on May 27, 2015 21:21:59 GMT
I have noticed that lately once a plug is fouled that's usually the end of it ,not like when I were a lad a ,cigarette lighter would burn off any oily deposits plus I hear there are a lot of cheap copy NGK,s about which can break down under load yoshi Yeh indeed, there is an official release from NGK which included a video showing the examples of some of the fake plugs... Usual things to look for, font's not matching between plug code and brand, codes and brands being in the wrong place (too high / low on the ceramic) and having shitty sealing washers that can come off the plug (you shouldn't be able to remove the washer from an NGK plug without cutting it off). Always worth watching out for that kinda stuff.. can cause a phantom ghost hunt for faults that don't exist.
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Post by zooma on May 27, 2015 22:13:35 GMT
I have noticed that lately once a plug is fouled that's usually the end of it ,not like when I were a lad a ,cigarette lighter would burn off any oily deposits plus I hear there are a lot of cheap copy NGK,s about which can break down under load yoshi Yeh indeed, there is an official release from NGK which included a video showing the examples of some of the fake plugs... That's good to know... our Chinese "friends" seem to be up to all kinds of mischief these days; assuming it's them behind the fakes.
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Post by rusty on May 28, 2015 20:46:41 GMT
If it's all 4 plugs it's more likely the valves?? The bike doesn't smoke when it runs though? hi mate, I know its a stupid question but did you get your carbs sorted and mixture screws set about right as my plugs were getting black and it was running worse than shit until I'd set them right and got the pilot jets cleaned, now the plugs are clean and its running great apart from getting them balanced again lol
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Post by p4ddy on Jun 15, 2015 16:33:08 GMT
Decided to make a start. Cleared a space on the bench ready to pop the b'stard engine on it. Going to put the old head back on and put new allen screws on the inlet rubbers whilst i'm at it. Touch wood i'll catch august before another summer is gone.
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Post by zooma on Jun 15, 2015 16:48:17 GMT
Touch wood i'll catch august before another summer is gone. Aye, cuz you'll never hear the last of it from Dave if ya don't! oss-popcorn Hope all goes well this time mate
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