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[djmikeb]

Good day I am the proud owner of a 1998 Seadoo Challenger 1800 Twin 110HP Rotax. I replaced both engines recently cause just thought it was time to compression on previous engines had gone down and one constantly was melting rave valve tops. Anyways I took the boat out for the first time since replacing engines and the RH engine full throttle keeps bogging up and down from 7200-5000 RPM's this also has new wear ring, rebuilt pump and impellar, along with 2 new rave valves. What can cause the engine to bog like this??

The LH Engine starts up and idles PERFECT but when I give it full throttle will only rev up to 4000RPM or completely shut off. I just purchased brand new carbs from Mikuni for this engine but is there anything else that can be causing this problem??

[biffdotorg]

Good day I am the proud owner of a 1998 Seadoo Challenger 1800 Twin 110HP Rotax. I replaced both engines recently cause just thought it was time to compression on previous engines had gone down and one constantly was melting rave valve tops. Anyways I took the boat out for the first time since replacing engines and the RH engine full throttle keeps bogging up and down from 7200-5000 RPM's this also has new wear ring, rebuilt pump and impellar, along with 2 new rave valves. What can cause the engine to bog like this??

The LH Engine starts up and idles PERFECT but when I give it full throttle will only rev up to 4000RPM or completely shut off. I just purchased brand new carbs from Mikuni for this engine but is there anything else that can be causing this problem??

I'm sure someone more mechanically inclined will chime in, but a few of the mercury models had issues with Head Temp sensors. Motors would run hard, and start fine when cold. Problem was when they needed to be restarted, that the sensor would give an indication that the engine was cold or vice versa and cause hard starting if no start at all.

Check with the dealer, if he is a Merc dealer or a BRP dealer experienced with Merc powered SeaDoo boats, they will know of this issue and know what two sensors to check/replace. The cost of the sensor is minimal.

If you still choose to purchase the boat, have them document that it had a hard warm start and address it. You will not want to be stranded on the lake in your first sumemr with it.

Good luck!