Yam 250

delboy · 16-03-2009, 11:36 PM

hi, can anyone tell me what a standard yamaha vx250 should rev up too, any help will be appreciated, thanks Del

Burty · 17-03-2009, 12:28 AM

no not really but a guess would be around 6500rpm

sterling · 17-03-2009, 07:24 AM

I believe it is around 5500 rpm

dowdy · 17-03-2009, 09:17 AM

what props you running?

delboy · 17-03-2009, 10:20 AM

Hi, only running 23s at the moment to see how it goes and they both go up to 4500 very quick and stay there so thought that might be the limit as they are small props but seems low

dowdy · 17-03-2009, 10:27 AM

you should be pulling 5500 on choppers, got access to a pair cleavers at all?

delboy · 17-03-2009, 10:35 AM

The 23s are normal yamaha props so i was worried about over revving, next time out i will make sure my gps is charged and get a speed as well, will also check my linkage again but both revving at 4500 is strange

dowdy · 18-03-2009, 01:56 PM

does not sound right,4500 to low,got a comp.tester?whip your plugs off and check,are they new/newish?still with any warranty?

dowdy · 18-03-2009, 02:10 PM

hi again,just pulled the spec sheet out on your 250,s. r.p.m. range is 5000 to 6000 and gives 250h.p. at the prop at 5500.4500 is way too low.hs4 props or cleavers should get you up quicker than your 3 bladed23,s.

adrenalin · 18-03-2009, 05:58 PM

Hi
I have a vmax 250 and it revs almost 6000 with 25 lab finished pro, that was on a racing rib 8.10 ocke.
I am using it now on a 7 meter rib (not racing) with a four blade revolution 19 and it revs 5400 to 5700 depends on the load.
I think 4500 is to low.

pro-rig · 18-03-2009, 07:47 PM

Have you checked to make sure your tachos are on the right settings.

OCRDA · 18-03-2009, 08:19 PM

I have a nice pair of 21" Lasers !! £300 the pair !!

delboy · 18-03-2009, 10:14 PM

Hi, thanks for all your replies, some more checks and will test again, cheers Del