Re: bogs down till warm
do compression test to rule that out. Next, if your mechanically inclined, you'll want to remove the carb (i40) and take it apart. Inspect the filter inside of it, and clean it out. If blue/green slime is present at filter and/or barb fittings on carb, you'll want to replace the fuel line. Also, the inline filter (under the hatch assy), overtime, the oring gets brittle and allows air to be introduced. The "fuel pump" is located on the carb, itself. No need to purchase a carb kit, when the only problem is the clogged filter, unless the "pumper"..aka diaphram, is hard and not plyable, then you'll need to purchase just 1 of them..15 buks.
Replace the fuel line with regular auto fuel line from store...$1.00 ft. get 10-15ft of it. Replace lines from tank to selector switch..(on/off/reserve switch), then from switch to filter, then filter to carb. No need to replace the pulse line nor the "reutrn" line, from carb to tank.
On the fuel sending unit, you'll see with a light, markings...on, ret, res, vent....the "on" on "res" are directly across from each other, normally the "res" is located to the "left" of the pink/blue wires coming from baffle/sending unit....good luck.
