Welcome to the forum. Firstly you would need to get that carb off and give it a proper clean, make sure all the jets are clean and free, use carb cleaner and compressed air. Don't get carb cleaner on the rubber parts especially the float bowl seal. With regards to the shift issues, you would need to either adjust your clutch or tear into it, but try adjusting it first, have a look here: http://www.3wheelerworld.com/showthr...tch-adjustment
1983 Honda ATC250R
1983 Honda ATC200E BIG RED (sold)
1984 Honda ATC200E BIG RED
1984 Honda ATC200X (sold)
1985 Honda ATC70 x 2
1985 Honda ATC250ES BIG RED
1988 Honda ATC250ES BIG RED
1995 Honda Frankentrike 50cc 2-stroke
2001 Honda TRX90
2004 Honda TRX300EX (sold)
2008 Honda TRX250TM
1976 Suzuki RV90M (sold)
1967 Vespa Primavera 125
1958 Massey Ferguson 35