Welcome to Jetboaters.net!

We are delighted you have found your way to the best Jet Boaters Forum on the internet! Please consider Signing Up so that you can enjoy all the features and offers on the forum. We have members with boats from all the major manufacturers including Yamaha, Seadoo, Scarab and Chaparral. We don't email you SPAM, and the site is totally non-commercial. So what's to lose? IT IS FREE!

Membership allows you to ask questions (no matter how mundane), meet up with other jet boaters, see full images (not just thumbnails), browse the member map and qualifies you for members only discounts offered by vendors who run specials for our members only! (It also gets rid of this banner!)

TPS vs ecu diagnosis help

Thread starter Marvin willis
Start date Jul 20, 2019

Marvin willis

Jetboaters Admiral

Jul 20, 2019

I’ve got a 08 ultra 250x 150 hrs. (Motor replaced at 106 hrs)It seems to always show the low battery voltage when I first start it (12.5volts when tested). Cranks right up. Here’s my issue. Runs perfect 99% of the time then randomly drops in power. Up down up down. Has cut off on others but not me. After u restart it, it will run fine again for a while and will start to miss again. Plugs are new. Happens at all gas levels. Sometimes it idles at different levels. But most of the time runs perfect. I did try to see how fast it would go one time and the speedometer went crazy after 50. Speedo Went down to 30 and bounced all over even though I was going way faster. Slight vibration after 65+ if it wasn’t missing.

You must log in or register to reply here.