I purchased a 98 Sportster the marina replaced a a gear to help with the idle speed just prior to me picking it up. I did a test run with them prior to this work being done and the boat performed flawless. I took it out today and it was a dog................ I started out slow and got up to plane and started to open it up. The engine seemed to rev and it felt as if the pump was caveatting. I would back down to 1/2 throttle and she would run fine. I moved people around figuring it was a weight problem but no change. I took everyone out of the boat and went out solo. She ran great. I added one person at a time and finally was able to run up to speed with all four of us in the boat. I slowed down at one point and she bogged down I was able to slow nurse the throttle up to full speed. I then tried to do some tubing forget it back to no power. We called it a day I pulled it from the water. I noticed alot of soot around the exhaust. I pulled both plugs and found one to be to be really fouled. I will change plugs and retry. I will be contacting the marina when they are open on Tuesday. Any suggestions???
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98 Sportster Accelaration Problem
- Thread starter resqdiver
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....?
Never heard of a "gear" to help with idle speed. But it does sound like you've got a enrichment problem. Like one of your carbs is running richer than it should.
I'd give them a call and tell them about he event and the end result in reading the plugs......see what they have to say. And more info on this "gear" would help.
Never heard of a "gear" to help with idle speed. But it does sound like you've got a enrichment problem. Like one of your carbs is running richer than it should.
I'd give them a call and tell them about he event and the end result in reading the plugs......see what they have to say. And more info on this "gear" would help.
ElectricalEngineer
New Member
Rotary Valve
I have the same boat. I recently experienced the same problem after rebuilding my engine. It winds up that I put the rotary valve plate back in the wrong position which greatly affected my high speed performance, even though I could run in idle to low speed.
Another thing I inadvertantly found out was that the PTO flywheel cover has to be installed or else you will start getting lake water up the carb air intake, particularly at high speed.
I have the same boat. I recently experienced the same problem after rebuilding my engine. It winds up that I put the rotary valve plate back in the wrong position which greatly affected my high speed performance, even though I could run in idle to low speed.
Another thing I inadvertantly found out was that the PTO flywheel cover has to be installed or else you will start getting lake water up the carb air intake, particularly at high speed.
We may have a winner
Electrical Engineer you may have solved my problem. When I opened the engine compartment I found the PTO cover off and laying in the bottom of the compartment. I have secured the cover and will retry. My only mystery at this point is why my gas gauge is not working. I checked the fuse it was fine. The gauge will illuminate when the nav lights are turned on. I removed the lanyard and pressed the start but not change in the gauge. Any thoughts?
Electrical Engineer you may have solved my problem. When I opened the engine compartment I found the PTO cover off and laying in the bottom of the compartment. I have secured the cover and will retry. My only mystery at this point is why my gas gauge is not working. I checked the fuse it was fine. The gauge will illuminate when the nav lights are turned on. I removed the lanyard and pressed the start but not change in the gauge. Any thoughts?
robin savell lloyd
Active Member
which type sportster do you have ? is it a 14 foot boat or does it have 2 engines?
robin savell lloyd
Active Member
That may be your problem. you say you had 4 people in boat how much do you think that they all weighed? :cheers:
robin savell lloyd
Active Member
It should pull a tube fine with a total weight of 500 lbs that includes the person in the tube. At least mine does. Find out how it runs with the new spark plugs in it and let us know. Good luck Robin :cheers:
ElectricalEngineer
New Member
Fuel Gauge
OK, I just checked the fuel gauge out. Here are some things to check:
A. Check wiring/connections (wiring issues typically account for over half of all electrical issues). The purple wire going to your guage should be power, and black wire is ground. Verify with a meter that your gauge is receiving power when you press the start button with lanyard removed. The backlight receives power through a different wire.
B. Check wiring/connections of your fuel sensor (should be the pink and pink with black stripe wires). Check fuel sensor operation. With your tank filled up, ohm out the two wires with a meter. Check to make sure you get some value between 50 and 100 ohms. If you get a short or open, you might want to replace your sensor.
C. If your gauge has power and your fuel sensor ohms out ok, you might need to replace your guage.
D. If no power at the guage, check that the relay on the main ckt board is operating. There is obviously some relay that a mcu is energizing for 30 seconds or so when you hit the start button without a lanyard.
OK, I just checked the fuel gauge out. Here are some things to check:
A. Check wiring/connections (wiring issues typically account for over half of all electrical issues). The purple wire going to your guage should be power, and black wire is ground. Verify with a meter that your gauge is receiving power when you press the start button with lanyard removed. The backlight receives power through a different wire.
B. Check wiring/connections of your fuel sensor (should be the pink and pink with black stripe wires). Check fuel sensor operation. With your tank filled up, ohm out the two wires with a meter. Check to make sure you get some value between 50 and 100 ohms. If you get a short or open, you might want to replace your sensor.
C. If your gauge has power and your fuel sensor ohms out ok, you might need to replace your guage.
D. If no power at the guage, check that the relay on the main ckt board is operating. There is obviously some relay that a mcu is energizing for 30 seconds or so when you hit the start button without a lanyard.
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