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Post by chewbaca on Nov 11, 2018 23:10:42 GMT -5
Going for a full rebore, nice.
Refreshing your engine with a touch of extra power.
if I had the money I would not mind doing some shop work myself
sometimes I get tired of always having to make do
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Post by chewbaca on Nov 11, 2018 21:29:32 GMT -5
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Post by chewbaca on Nov 7, 2018 22:04:39 GMT -5
your scooter may be restricted
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Post by chewbaca on Nov 6, 2018 23:37:16 GMT -5
did you ride a two stroke?
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Post by chewbaca on Nov 5, 2018 12:29:07 GMT -5
just a good hone and new rings should make a nice improvement
most automotive cylinder hones are too big for a 100 cc cylinder so.. maybe use a master cylinder hone ?
also don't forget to check the valves
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Post by chewbaca on Nov 5, 2018 11:57:01 GMT -5
it sounds like you have low compression
most likely it is a damaged exhaust valve. A scored cylinder or chipped intake are also possible
a new head is about 34 to 45 $ on eBay or Amazon
however if you do a real valve job with new valve guides, seals, titanium retainers and grind new valve faces. You can gain about 1000 more RPM before valve float for about the same money but it's more work.
grinding your rocker arms smooth and optimizing the shape is good for another 1000 RPM but its even more work and you can ruin the arms temper if you're too aggressive
every gram of weight removed from the valve train makes every other gram removed more effective
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Post by chewbaca on Nov 2, 2018 23:17:38 GMT -5
you don't set the time on a gy6
its factory set by the fly wheel key way
only maybe half a degree of play between the pickup and the mag tab
almost impossible to mess up
if you want to change the timing get an after market cdi
or shave the key
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Post by chewbaca on Oct 22, 2018 22:48:52 GMT -5
you need to pull the valve out of the head so you can inspect the contact surface
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Post by chewbaca on Oct 22, 2018 1:08:35 GMT -5
so it sounds like one of your valves is pitted or chipped
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Post by chewbaca on Oct 11, 2018 19:00:45 GMT -5
sounds like a sticky choke that worked itself free
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Post by chewbaca on Oct 4, 2018 23:26:58 GMT -5
check the valve springs
if they are not counter coiled
that being the inside spring being twisted opposite the outside
then the two springs can bind up at certain frequency
I have found wrong springs in both stock motors and after market sets
your motor should be good up to 5000 rpm with only a single outside spring
but will start dumping at the exhaust above that
good enough for temporary fix
is also somewhat more low end power with one spring on the valve
ty valve spring retainers and rocker arm grind and polish
can push the valve float up another thousand rpm if you wanted
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Post by chewbaca on Sept 15, 2018 5:43:06 GMT -5
does the pipe smell like fuel after cranking for a bit
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Post by chewbaca on Sept 10, 2018 16:37:51 GMT -5
you all know how I feel about scooter bodywork get rid of it !!!! my girlfriend's scoot had two headlights @ 55w each the little power supply was not sufficient for that all the dash lights, running lights, and recharging the battery so everything was dim and the battery died and needed replacement every few months. I got some nice LED cube lights aimed one high the other low, put about  watts back into the system. tucked them up behind the stock lenses and inside all the bodywork. looked better than stock The battery stopped dying and the running and dash lights stopped dimming at idle I think the stock bulbs where some ridiculous dim 18w×2 and the stator didn't have the amps for 55w×2 |
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Post by chewbaca on Sept 7, 2018 12:15:12 GMT -5
you can hand test for compression, if you can grab the variator and slowly turn over the engine you should feel the compression stroke. It will have significantly more resistance, if you have even enough compression to start.
a compression test is still a good idea
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Post by chewbaca on Aug 29, 2018 12:13:02 GMT -5
I have dealt with a loose headset bearing it doesn't look like that
I strongly recommend stripping those handlebars down so you can see what is happening when it wiggles like that
if its a broken weld then the bar needs replaced or welded
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watts back into the system.