nickpro44

Hello all,
I currently have an aeromarine avenger 44 cat powered by a quickdraw 25 engine. The engine seems to "bog down" at a certain speed. The engine will not kick into "second gear." I sent the engine to quickdraw marine, and $400 later, the engine was rebuilt, and was updated to the new version of the engine. I thought the engine would run fine after that, but it did not.
I have tried almost everything imaginable to fix the possible problem, such as using a different gas tank, replacing all fuel lines, and removing the gas filter.
Any suggestions to why this is happening?

ken0276

My Feedback: (2)

Send it back again, they'll fixed for you.

SS RC Boats

Does the engine really "bog down" at a certain speed or "after a few minutes of running"?Also did you get Mitch to test the engine?I have been running QD 25's since the first one they made and almost every model after that right up to their RE Electronic ignition motor and never had that problem.Have you checked the diaphram in the carb for any damage,or tried to richen the carb?Is it the exact same problem it had even before it got rebuilt?Does the motor run hot?Would love to help you get it working.

stempak

sounds a little lean on the top end? do you run enough oil in your gas? also what rpm's are you running? those early high revs require special props and the output shaft weight. also possible it's over proped or the prop is to far in the water. If it has just been rebuilt it should have no problem that's what they do everyday, It's always possible they didn't do something right but I doubt it?

nickpro44

The engine seems to bog down at a certain speed. The boat will go as fast as a stock zenoah G-23, and not kick into the "second gear." It does not seem to be a time trouble. They, I believe it was Mitch, hooked the engine up to the dyno, and said everything looked great. They even adjusted the carb, and replace the diaphram.
The engine will start and idle great. When the boat is out of the water, you can rev the engine, and it gets up in the "second gear." Even when I hold the boat in the water, and rev the engine, it revs all the way up. Once I let go of the boat, it gets stuck at that certain speed. I have messed with the carb for several hours, trying to get the engine to run. I even put the carb to the factory settings and went from there.
The engine has not been used a whole lot, maybe 5-10 times per year, so I know it is not worn out. Any ideas?? Thanks.

stempak

sounds like your over proped or you need to raise it out of the water. It is not good to rev these motor's out of the water like you can with nitro's

nickpro44

I was told to run 8 oz/gallon of the Honda HP2 hi-performance 2 stroke synthetic racing oil. I am not sure the exact rpm, but the engine seems to be stuck around maybe 8,000-10,000. As far as a prop, I am using a balanced and sharpened prather 275 prop.

BMAD01

So tell me, What kind of Q/D 25 is it? Is it the high rev, high torque, or is one of the older ones? What carb is on the engine? What pipe are you running on it? What kind of fuel tank are you using? Brian

stempak

if quickdraw ran it and said it was good it should be good. try raising your prop up I think that it's too low in the water and not letting it rev. If it is a high rev they very picky on the prop to make them run right unlike the the other qd's and zens. also what pipe? it could be way out of adjustment if it's not a qd pipe.

If it is a high rev it should turn 20k+ and your boat should do around 67mph! a tach might be a good thing to get.

if it's a high rev I really don't think a p275 will work. You'll mostlikely want to call mitch a ask what prop he suggests he built it.

nickpro44

The engine is an older one that mitch "updated" to a newer one. It has two water inputs, 3 water out, and a "pressure tube" from the bottom of the carb to the side of the engine. The carb is a walbro "big bore" carb (WT-257). I am using a bh hanson pipe with a 90 degree header. I am using the stock tank that came with my avenger from aeromarine, a sullivan I believe.

Justaddwata

My Feedback: (3)

You have any pics of the boat, motor setup and transom setup Nick?

BMAD01

OK, Just for laughs try sliding your pipe forewards about 1/2" and raise the prop. Tell us what happens then. Good luck, Brian

nickpro44

Actaully, no, I do not have any pictures of the setup. I would take some now, but I took the engine out of the boat and am in the process of changing the motor mounts to put the motor in another boat. This motor worked when I first got it in my proboat shockwave, so that is where it is going now. This will allow me to see if it has to do with the setup of my avenger or not. I do not think it is the setup of my boat, because Dean werges set up, and mounted the motor in the boat for me. I knew this was an important step in building a boat, so i thought i would let him do it for me.

stuch

a 257 can bee tuff to tune in certain weather conditions. try a 644 way easyer to tune and hold a tune. i put a 257 on a new modded 260pum and could not get it to come up on the pipe tryed adjusting the carb like 50 times. then i went to a wt644 with the choke removed and it ran like a bat outta hell all day everyday. since....

nickpro44

That is easier said than done. I have a "pulse fitting" on the botom of the carb, that is atached to the side of the motor. I would have to send another carb away to quickdraw and pay even more money, which is not what I want to do right now. This motor has ran great with this carb at one point, just not lately.

dwr9

I would try lengthening the pipe and/or possibly a smaller prop. Doug

nickpro44

Is a prop shop 6717 a better prop for this motor and boat, than the prather 275?

Justaddwata

My Feedback: (3)

According to well known Nick in Colombus
quote]ORIGINAL: nick88
I currently own an Avenger 44, and it is the best boat I have ever owned. I have a Quickdraw 25 along with a number of upgraded items in this boat and WOW!! This boat handels like a dream, and is fast, really really really fast. This boat with a Quickdraw and a Prop Works 6717 prop does 70+, and is stable all the way.
[/quote]
I think he had Dean Wergers do some painting on it too

Justaddwata

My Feedback: (3)

According to well known Nick in Colombus
I think he had Dean Wergers do some painting on it too

stempak

a p275 is a good prop for your sw 55 with a stock to mildly modded zen. I'm guessing it's a 4 berring highrev. A topend screamer that won't really turn the props of the zens qdht's etc. needs exact precise tuning to run at all.

Justaddwata

My Feedback: (3)

Again I see Nick in Colombus clarifying for you in post 14
Nick88 had both boats your asking about and coincidentally had a QD25 in his Shockwave before moving it into his Avenger.
You and he seem to have a lot in common
You can see his [link=http://www.rcuniverse.com/forum/m_1519201/mpage_1/key_/tm.htm]boats here in Post 3[/link] - You have probably seen them around..

stempak

a 6717 would be a good starter with a ht I'm pretty sure you don't have one though. Do you know what piston it has?

Also your motor could be lean they do need adjustments once a run but not always, I would run a little more oil 10-12oz a gallon it will make more power most of the time.

you can try these 2 props to start with 6518/3 415-420 and 1667 small diameters as mentioned big diameter will overload it easy.with a zero band pipe. you really want a qd hot pipe

SS RC Boats

Well for starters buy a QD Hot Pipe,they run alot better than a Hanson pipe on QD's.I would run 10oz. of oil as recommended by Mitch.Using the Big Bore 257 carb is ok and i know because they are on all my QD's beside the RE motor(which comes with the WYK33) and "never" found it hard to tune in,so i would recommend to either richen the high end needle or raise the prop a bit.You could even work with the pipe length.

nickpro44

Ok, thanks for the help!! I will try and hope for the best!!

coyv10

Also try the 644 easer to tune and has the same foot print as the 257- still sounds like too much prop..