duff
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Posts: 82
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Post by duff on May 13, 2006 15:50:48 GMT
right okay i got the rocker cover off and iv timed the motor up but im not shure where to take the meshurement from?
now i had a look and i stcuk the feeler gauge inbetween the spring cup and the tapit and it fits but does not go throgh the other side as the tapit gos down to a point should i be able to put the feeler gauge all the way under past the point?
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Post by cb50j on May 13, 2006 16:19:44 GMT
you should be able to slide your feeler gauge all the way through, not too loosely or tight, just a little resistance............
................... #sprint#
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duff
Forum Master
Posts: 82
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Post by duff on May 13, 2006 16:59:23 GMT
right and i am taking it from the right place then and there to much from what im hearing.
thing is it was backfiring the lot and seemed like it has no fuel kept stoping and starting ro me that would be a carb prob shurely the valve gaps being advanced clighly would not do that as that is what it seem like at the moment.
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duff
Forum Master
Posts: 82
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Post by duff on May 13, 2006 21:27:23 GMT
if i change them and it dont do much and i also clean the carb you reckon mayby going for a bigger main jet will do any thing?
i also thing i should get the head of ans see if a piston ring has gone or any thing.
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Post by cb50j on May 13, 2006 21:48:28 GMT
the pink arrow shows where you should be measuring with your feeler gauge, the 0.05 blade should slide freely through the small gap not loosely or tight.......  ................ #sprint# |
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duff
Forum Master
Posts: 82
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Post by duff on May 13, 2006 22:06:37 GMT
yer it does slide in the way you describe but it stops cus it hits the on the point that the tappit gos down?
so there rong then?
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Post by cb50j on May 13, 2006 22:10:40 GMT
if you've got the "T" timing mark right you should be able to slide the feeler gauge as described...
............... #sprint#
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duff
Forum Master
Posts: 82
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Post by duff on May 13, 2006 22:13:35 GMT
yer iv got the fan on the t and the big hole in the cam pointing way from the motor and the rocker arms are pritty level so both the valves should be closed.
also when you had yours timed up was it on the rock?
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duff
Forum Master
Posts: 82
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Post by duff on May 14, 2006 21:17:38 GMT
well i changed the valve gaps to day to 0.10 on the outlet and 0.05 on inlet and bike is the same has good acsell now but back fires and pop like i duno what as soon as i hit full throttle help?
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Post by cb50j on May 15, 2006 1:57:49 GMT
mixture is lean.......there's plenty posts about fuel/air mixture.......
............. #sprint#
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Post by BillyGreen1973 on May 15, 2006 16:06:12 GMT
A backfire is also caused by unburnt fuel entering the exhaust and igniting there. I would check your spark plug is OK and correctly gapped.
Chuck out the chinese one and get yourself an NGK C7HSA. They are on ebay for around £2
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duff
Forum Master
Posts: 82
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Post by duff on May 15, 2006 19:45:14 GMT
also its missing as well quite bad.
i know quite a bit about motors/cars and stuff being a apprentice mechanic so i was working my round to all of those things fuel mixture did come into mind but i dont see how that and the spark plug would make it back fire i can understand the spark plug making it miss, keep in mind its got worce and worce slowly and she runs spot on on idle.
will av the plug out to moz know peeps in the bike trade so will blag a new spark plug if the one in is looking crap also iv already got an NGK in.
any tips on messing with the mixture?
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duff
Forum Master
Posts: 82
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Post by duff on May 15, 2006 19:53:47 GMT
one more thing since iv changed the valve gaps its missing and just being poo from cold as soon as you give it any real throttle gets to about 20 mph and starts fing around, it was taking a bit for it to get real bad befor but it wasent brill in first place 20 mph on slight hill used to do 40mp and i have changed the rollers twice now lol.
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