I'm back after 4 years with same problem. You can search and find my original post from 2013 (proV200 or dilb1229).
1991 ProV200 2-stroke bogs immediately when giving it throttle. Will barely climb to 2000 rpm.
A little history, more at old post. Problems have always been fuel delivery related. Fuel (old), fuel pump (torn diaphragm), and carburetors (always the carburetors).
Last year, same problem. Cleaned the carburetors, fresh fuel (or at least 60/40 fresh/old) with Stabil. Ran great several weeks in a row. Went to an event to teach kids to ski. Ran great on Day 1. Probably burned 10 gallons or so. On Day 2, it ran but with reduced power. Enough to pull the kids, but that was about it. Probably burned another 7-8 gallons. Day 3, would start but that was about it. Bogged down immediately when given throttle.
Pulled the water separating fuel filter - no water at all. Disgusted, put back on trailer and it has pretty much sat untouched until now (9-10 months). Event is coming up again in 2 months.
I have drained the tank of all but a couple of gallons of the remaining fuel (still no water present), added 'Mechanic in a Bottle', 5 gallons of fresh 91 octane. More 'Mechanic in a Bottle'. Ran it on the hose for about 15 minutes at ~1500 rpm. Did this 3 times over about a week, supposedly to let 'Mechanic in a Bottle' do it's thing. No overheat, starts, runs and revs easily with no load, in neutral or in gear. Took it to the lake. Harder to start, tended to die when put in gear to back off trailer. Finally off the trailer, bogs immediately when given throttle.
Back home, removed the carbs, removed all jets and passageway screws, soaked overnight in Berryman Chem-Dip carb cleaner, rinsed in hot soapy water, rinsed again in hot water, dried and blew passageways with compressed air, lightly coated with silicone spray and blown through passageways. Re-assembled (did these one at a time and sketched diagram so I put the jets back in the same places), idle screws set to 1-3/8 turns, float level 5/8 inch. (Side note - carbs looked clean, no corrosion, no plugged jets or other holes, idle screws and floats to spec.)
Took to the lake. Motor started easily (maybe easiest ever cold), idle is maybe a little low (600 vs 700). Backed off the trailer. Gave it throttle, bogged immediately.
Came home, put clear tubing on fuel pump exit and plugged line to carb. Cranked motor and fuel pumped out. Did this to both fuel pumps so I don't think it is the fuel pumps. Couldn't find any indication of fuel line leak or air leak. Primer bulb acted like it's check valve was leaking. Will replace that, but don't see that it would cause my problem. Could it? Also will replace the fuel/water filter.
It always seems to be the carburetors and I'm still somewhat convinced that's where the problem lies, but I'm truly baffled on how it ran great on Day 1, fair on Day 2 and pretty much not at all on Day 3, with nothing done to it between those days.
Floats? Needle valves? Can see it running poorly if some aren't right, but all (or most) of them? Wouldn't there be some indication with no load? I have the old floats and needle valves from previous re-build. Worth swapping them out?
Am I setting the floats wrong? Same way as when it ran well. Upside down, measuring from the surface of the gasket to the top edge of the float as you are looking at it. 5/8 inch.
Thanks for looking and appreciate any help.
Steve
1991 ProV200 2-stroke bogs immediately when giving it throttle. Will barely climb to 2000 rpm.
A little history, more at old post. Problems have always been fuel delivery related. Fuel (old), fuel pump (torn diaphragm), and carburetors (always the carburetors).
Last year, same problem. Cleaned the carburetors, fresh fuel (or at least 60/40 fresh/old) with Stabil. Ran great several weeks in a row. Went to an event to teach kids to ski. Ran great on Day 1. Probably burned 10 gallons or so. On Day 2, it ran but with reduced power. Enough to pull the kids, but that was about it. Probably burned another 7-8 gallons. Day 3, would start but that was about it. Bogged down immediately when given throttle.
Pulled the water separating fuel filter - no water at all. Disgusted, put back on trailer and it has pretty much sat untouched until now (9-10 months). Event is coming up again in 2 months.
I have drained the tank of all but a couple of gallons of the remaining fuel (still no water present), added 'Mechanic in a Bottle', 5 gallons of fresh 91 octane. More 'Mechanic in a Bottle'. Ran it on the hose for about 15 minutes at ~1500 rpm. Did this 3 times over about a week, supposedly to let 'Mechanic in a Bottle' do it's thing. No overheat, starts, runs and revs easily with no load, in neutral or in gear. Took it to the lake. Harder to start, tended to die when put in gear to back off trailer. Finally off the trailer, bogs immediately when given throttle.
Back home, removed the carbs, removed all jets and passageway screws, soaked overnight in Berryman Chem-Dip carb cleaner, rinsed in hot soapy water, rinsed again in hot water, dried and blew passageways with compressed air, lightly coated with silicone spray and blown through passageways. Re-assembled (did these one at a time and sketched diagram so I put the jets back in the same places), idle screws set to 1-3/8 turns, float level 5/8 inch. (Side note - carbs looked clean, no corrosion, no plugged jets or other holes, idle screws and floats to spec.)
Took to the lake. Motor started easily (maybe easiest ever cold), idle is maybe a little low (600 vs 700). Backed off the trailer. Gave it throttle, bogged immediately.
Came home, put clear tubing on fuel pump exit and plugged line to carb. Cranked motor and fuel pumped out. Did this to both fuel pumps so I don't think it is the fuel pumps. Couldn't find any indication of fuel line leak or air leak. Primer bulb acted like it's check valve was leaking. Will replace that, but don't see that it would cause my problem. Could it? Also will replace the fuel/water filter.
It always seems to be the carburetors and I'm still somewhat convinced that's where the problem lies, but I'm truly baffled on how it ran great on Day 1, fair on Day 2 and pretty much not at all on Day 3, with nothing done to it between those days.
Floats? Needle valves? Can see it running poorly if some aren't right, but all (or most) of them? Wouldn't there be some indication with no load? I have the old floats and needle valves from previous re-build. Worth swapping them out?
Am I setting the floats wrong? Same way as when it ran well. Upside down, measuring from the surface of the gasket to the top edge of the float as you are looking at it. 5/8 inch.
Thanks for looking and appreciate any help.
Steve
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