I have a 1989 Honda Acty SDX 5speed 550cc here in NJ. i have a intermittent power loss under load. when i am on the highway around 90-100km in a small hill the acty loss speed to the point that i have to downshift. i know i dont have the most powerful truck ever but this issue is intermittent. I dont have idle issues or any trouble to start the car in the mornings. I replaced the spark plugs checked rotor and cap (nothing wrong) but i cleaned the terminals replaced fuel filter removed carefully the carburetor ( checked for any vacuum leak/diaphragm) cleaned it really well. it seems that the carburetor was rebuild in one point. i am not in expert with carburetors but I DONT KNOW IF IT IS NORMAL but when i fully open the throttle body side the other butterfly (by the metal mesh) does not open fully checked vacuum hoses i checked the only one electronic\power valve in the carburetor with 12v and it clicks I dont have black or white smoke i did a compression test 170 all 3 cylinders the only that i can think of is the exhaust. it has an aftermarket exhaust so it does not have the 2 pipes going to rail and something else. i got the truck like that. my other possibility is the lack of air into the air intake. i checked the air filter and it is fine but i cant not figure out where exactly is inlet of the fresh air (i know it goes to the frame rail) Thank you
