bogging when warm

[sarniascoot]

so i have oticed something with my scooter and that is that as soon as i warm the scooter up it has less power. if i let the scooter sit overnight and then just start it and take off within 10 seconds of starting the scooter, it accelerates quite nicely. but as soon as i make it to the corner and go to take off, it was way less power. about 45% of the power it had when it was cold. if i sit at a stop sign for a minute, that kinda helps. ill have 65% of the power from when it was cold. i have checked the shroud and the cooling system and everything is normal so im at wits end.

[90GTVert]

Often an engine that runs better when it's first started or cool is on the lean side. Sitting for a bit and then going could be telling you the same thing. Could be getting plenty of or too much fuel at idle so it does better for a moment from the additional fuel in the mix.

[jmkjr72]

i have learned to check that i have the proper heat range plug as if you have too hot of a plug it will get hot fast
and yes if i have never had the shrouds off i will pull them and make sure things arent pluged up
i have seen only 1/2 a shroud and i have seen them so packed with mud bugs and crap(i live in dairy farm contry so yes it proably is manure)
but when i have the plug out to check to see the heat range you can look at the plug for general health

then next i would consider the enrichment circut(we dont have tradtional chokes if it sticks on you could be realy rich)
and after i have ruled out the choke i will move on to jetting and then the contra spring

[sarniascoot]

ill have the shroud off and take a look before i take my 100 mile run today and the engine is running in the proper mixture range with a perfect chocolate brown. the plug is also the proper heat range. so its either a plugged shroud (i do a LOT of riding on mud trails) or the contra spring. we shall see.