9000 RPM??

[danzr1]

One of my gauges is showing close to 9000 rpm. The other is maxing out at 8100 on my SR210. Obviously its off, but what would cause this?

Also, can the wear ring tolerance be checked from the clean outs? I'm only getting 35 MPH.

 

[Seadeals]

Assuming you have an SR210 not a 230, you should top at 8000 rpm. The tachometers are not very accurate and After changing one, I still read 8400 on one and 8100 on the other at WOT; but that is better than the high reading I was getting before the swap. YDS proved the engines were not really going that high. You can use the pitch/sound of the engines to confirm they are close as well. 35 mph is slow (I usually see 43 tops). Wear ring access is probably best through the intake grate if you are not going to pull the pump. Pulling the pump is the best way unless it has never been done and you have to fight them off. Check the impeller visually for any dings through the intake tunnel if on the trailer.

 

[Billtex2000]

I could never get my tachometers to match even though my throttles were even and the motors sounded like they were in synch. I had a bad tach that was reading low and it drove me nuts. If you listen to the pitch/tone of the engines you can tell pretty well when they are in synch. I replaced the bad tach and did a minor throttle cable adjustment and now the tachs are within 200rpm of each other. I got lucky and found one on ebay for $69 bucks. New you're looking at $250. Your part number is below, if you want to look around and give that a try.
F1T-U8245-00-00

 

[David Martin]

I would look to see if you are caveating the one motor......if it was a tach just not reading right you performance would be unchanged......if you are moving slower cavitation could be a problem.

 

[danzr1]

Ok, I'm heading out now. I'm familiar with caviation, but how would I know on a boat like this? Feel for power on each engine? This is my first year with it, so I don't know any better, but my GPS app on my phone showed a top speed of 35, flat windless day, with only 4 people.

 

[Seadeals]

Even if cavitating, the ECM will limit rpm to 8000 on that model. It may spike for a second like catching air.

 

[danzr1]

I had taken my big mable 2 person (2 kids on it ) tube out today, I had trouble getting on plane, until we had 1 bigger person move to the front. I'm not sure if this is indicative of anything. I'll pull the boat this week and check the intake grate for missing silicone.