Top End RPM Loss STILL!

[Charger200]

ok here it is .

2.5 carb high perf 245. fresh rebuild 7hrs. Just replaced all 6 coils and plug wires.

Boat will run 75mph all day on the pad with a 26p chopper and about 6k rpm but will not go any further

it wil run about 71 with a 25p laser 2 at about 6200 rpm

thanks for help again guys

Jay

[Shaun Torrente]

What is your Fuel pressure?

What is your total timing set at?

Shaun

[patchesII]

and does it still have the factory size jets in it

[Dave Strong]

Or factory break in jets?
Dave

[Charger200]

Have never changed the jets so im guessing factory.

What is the best way to check full advance timing? I think that maybe part of my issue i just dont know a safe way of doin it

[200VEGAS]

if you do a search for settting timing you should come up with several good methods as well as jay smith 's

[Charger200]

thanks vegas just checked it out

[Dave Strong]

Accel pump carbs had .072 mains, .034 progression, .052 idle air jets.
non pump carbs, .068 main, .050 progression, .070 idle air jets.
only 1 idle air jet per carb on stbd side.
I see your in Calgary who did the rebuild?
Dave

[Charger200]

myself but Ive Been Talkin with Keith @ Calgary Powerboat Services

I never rebuilt the carbs but this was a pre rebuild issue which sparked me to rebuild

[Dave Strong]

If you go to your cabin Radium way and still are not 100% sure on timing or jetting, I live 10km north 93-95 junct and parents have cabin on Winermere Lake. Used to have 2.5 Carb, still have tools and manuals. If wan't a hand and spend a day checkin etc have some smaller props as well. Give me a call 250-347-0094, not working so have lots of time on my hands.
Dave

[Charger200]

that would be awsome Dave. might try to get out there next weekend but ill get in touch with ya

[Dave Strong]

:cheers:
Dave