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wont rev over 3500 rpm Will not rev over 3500 RPM Rate Topic:

#1 jrdrick

Novice

Group: Members
Posts: 6
Joined: 09-June 10
Water:fresh
Year of DOO:1998
Model of DOO:Challenger 1800
Engine in DOO:110hp Rotax (800)

Posted 09 June 2010 - 09:19 PM

I have a 97 Challenger 1800. It starts, and idles fine. It will not rev over 3500 rpms. This makes for a slow ride. any help?

#2 Rave1

Novice

Group: Members
Posts: 33
Joined: 01-June 09
Water:cedar creek
Year of DOO:1997
Model of DOO:Challenger
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 04:26 AM

Both Engines?

#3 Kevin Leclair

SeaDooSportBoats.com Founder

Group: SDSB Management
Posts: 5,127
Joined: 01-October 03
Water:Allatoona Lake
Year of DOO:2010
Model of DOO:210 Wake
Engine in DOO:Twin Rotax 4-TEC SCIC

Posted 10 June 2010 - 07:22 AM

What condition are your impellers in? Have you had a look in the intake grate to ensure there is nothing in there blocking anything?

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#4 jrdrick

Novice

Group: Members
Posts: 6
Joined: 09-June 10
Water:fresh
Year of DOO:1998
Model of DOO:Challenger 1800
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 07:51 AM

Yes it is both motors, Nothing cloging the intake grate.

#5 jrdrick

Novice

Group: Members
Posts: 6
Joined: 09-June 10
Water:fresh
Year of DOO:1998
Model of DOO:Challenger 1800
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 07:52 AM

Rave1, on 10 June 2010 - 04:26 AM, said:

Both Engines?

YES both motors.

#6 Kevin Leclair

SeaDooSportBoats.com Founder

Group: SDSB Management
Posts: 5,127
Joined: 01-October 03
Water:Allatoona Lake
Year of DOO:2010
Model of DOO:210 Wake
Engine in DOO:Twin Rotax 4-TEC SCIC

Posted 10 June 2010 - 08:32 AM

It's possible that it is your carbs, http://seadoosportbo...m-on-rotax-657/

#7 jrdrick

Novice

Group: Members
Posts: 6
Joined: 09-June 10
Water:fresh
Year of DOO:1998
Model of DOO:Challenger 1800
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 11:15 AM

Ever heard of a rave valve problem? I will pull the carbs though.

#8 Kevin Leclair

SeaDooSportBoats.com Founder

Group: SDSB Management
Posts: 5,127
Joined: 01-October 03
Water:Allatoona Lake
Year of DOO:2010
Model of DOO:210 Wake
Engine in DOO:Twin Rotax 4-TEC SCIC

Posted 10 June 2010 - 11:28 AM

Yes that is possible, here was a similar discussion regarding the rave valve - http://seadoosportbo...311-rave-valve/.

#9 Rave1

Novice

Group: Members
Posts: 33
Joined: 01-June 09
Water:cedar creek
Year of DOO:1997
Model of DOO:Challenger
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 07:25 PM

The Raves usually have an effect a little higher then 3500. Although its possible. Might want to clean connecter at MPEM. The twins operate off the same controller,I believe also find all grounds and clean them.The mpem might be running in like a safe mode,for instance a faulty ground could cause it to falsly sense an engine overheat{explaining why both engines are acting like that.} Keep us posted-the present might solve the future

#10 Rave1

Novice

Group: Members
Posts: 33
Joined: 01-June 09
Water:cedar creek
Year of DOO:1997
Model of DOO:Challenger
Engine in DOO:110hp Rotax (800)

Posted 10 June 2010 - 07:29 PM

Rave1, on 10 June 2010 - 07:25 PM, said:

The Raves usually have an effect alittle higher then 3500. Although its possible. Might want to clean connecter at MPEM. The twins operate off the same controller,I believe also find all grounds and clean them.The mpem might be running in like a safe mode,for instance a faulty ground could cause it to falsly sense an engine overheat{explaining why both engines are acting like that.} Keep us posted-the present might solve the future

Also the fuel selector might be plugged up,try moving it to Reserve,

#11 adventurer

Novice

Group: Members
Posts: 8
Joined: 22-October 09
Water:caribbean
Year of DOO:1998
Model of DOO:Challenger 1800
Engine in DOO:Twin 110hp Rotax (800)

Posted 10 June 2010 - 09:34 PM

Hi there!!

just to be sure you can try the neutral switch, disconnect it from the plug and try reving the engines, it could be stuck and making the comp to think
the selector is still in neutral.

good luck!!