Volvo AQ170a wont exceed 3000 rpm help!

[Jeff Wooster]

Starts fine . idles fine . put it in gear and full throttle wont exceed 3000 rpm. putts along but id like it to go a little faster ya know

 

[Don S]

Re: Volvo AQ170a wont exceed 3000 rpm help!

List of possible causes of low WOT (Wide Open Throttle) rpm.

In no particular order

Engine Won't Reach Operating RPM. Check

1. Fuel condition. Type and Octane possibly old fuel
2. Propeller pitch or diameter, damaged blades
3. Restricted fuel pickup tube or anti siphon valve Fuel System Test
4. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
5. Marine growth on hull and outdrive
6. Wrong gear ratio in outdrive
7. Restricted carburetor air intake (clogged flame arrestor)
8. Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
9. Poor cylinder compression Compression Test
10. Carburetor defective, or wrong type.
11. Fuel pump pressure and vacuum
12. Boat overloaded, improperly loaded, or improperly trimmed.
13. Engine Overheating
14. Engine timing and ignition system operation
15. Remote control cables and linkage for proper travel to open throttle plates fully.

 

[Jeff Wooster]

Re: Volvo AQ170a wont exceed 3000 rpm help!

thanks don, will def check it out...i alsp recently replaced the spark plugs, distributor cap and rotors ...i had forgot which cables go where and found a diagram that u posted to get them right...could i still have them wrong? would the boat run at all if some were mixed up? also, (thx for your patience) the rotor i purchased is smaller and shorter, does this seem right ? the part # matches up too....thanks again!

 

[Don S]

Re: Volvo AQ170a wont exceed 3000 rpm help!

i alsp recently replaced the spark plugs, distributor cap and rotors ...i had forgot which cables go where and found a diagram that u posted to get them right...could i still have them wrong?

Did it run ok before you did the work on the engine?

 

[Jeff Wooster]

Re: Volvo AQ170a wont exceed 3000 rpm help!

yes it did, i also took off the outdrive replaced the bellows....

 

[Jeff Wooster]

Re: Volvo AQ170a wont exceed 3000 rpm help!

sorry, it was overheating , so replaced the thermo and now runs cool

 

[Don S]

Re: Volvo AQ170a wont exceed 3000 rpm help!

Not sure how I posted a picture for the firing order, I don't have one, and yes having 2 wires crossed will cause your problem.
The firing order is 1-5-3-6-2-4 Hopefully #1 is in the right place.
Did you set the point dwell, and then recheck the timing when you did the tuneup?

 

[Jeff Wooster]

Re: Volvo AQ170a wont exceed 3000 rpm help!

spark plug #1 is closest to the transom or farthest? how do i know which is #1 on the distributer? and i have no idea what point dwell is, sorry super new at this...your info is much appreciated