125 HP Volvo Penta I/O stalls/hesitates when accelerating

[Kyle Chism]

This engine is a 1984 and it runs well. It is on a 19 ft 1984 Bayliner Capri Cuddy 1950C. The RPM's are above 4000, sometimes near 5500, so I don't think this is the problem. I have thought about getting the carb rebuilt, but didn't know if this would help. I haven't used the boat for skiing yet, but would like to in the near future. This weekend when pulling an intertube it would stall if I shut the engine off before pulling the tuber. If I let the engine run while the tuber prepared, it was generally ok. It would hesitate though if I accelerated too fast. The spark plugs are clean and I am getting good oil pressure, but I don't think that is a factor. I am wondering about the lean/rich set screw, but I am unsure where this is. I will look in the near future. Any help would be greatly appreciated.

 

[fone_man]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

I would assume model is AQ125 A or B...<br /><br />When requesting help & info, we need all information associated with IO<br /><br />Carb... Make/Model & SN<br /><br />IO... 4 cyl?????????<br /><br />Let us know<br /><br />

<br /><br />------------------<br />"Keep It Between The Bouys" & "Good Luck"!!!<br /><br />fone_man

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

I don't have the carb info with me, but it is the initial one with the engine. I just know now that it is a single carb 4 cyl. engine model AQ125 A. I have been told to check the accelerator pump, but haven't yet.

 

[fone_man]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Ok Kyle......<br /><br />You are running a GM 181 CID, 125 HP 4 cyl & most likely 2 bbl Rochester Carb / 2GC...<br /><br />Carb rebuild is in order... which includes accelerator pump replacement & adjustment.<br /><br />Replace float with brass as the synthetic one absorbs fuel & gets heavy & drips fuel down venturis... cause rough idle/plus flooding which kills engine.<br /><br />While you are in there replace points & set timing, so everything is right & in spec.<br /><br /><br />

<br /><br /><br />------------------<br />"Keep It Between The Bouys" & "Good Luck"!!!<br /><br />fone_man

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

About how much for a carb rebuild if I leave it in the boat/take it out? I'll check my shop workbook about the float and timing, but I may have to ask you how to do this. <br />Do you think this will fix the problem more than likely? Thanks for the info.

 

[fone_man]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

BINGO!!!!!!!!!!!!!!!!!!!!!!!<br /><br />

<br /><br />------------------<br />"Keep It Between The Bouys" & "Good Luck"!!!<br /><br />fone_man

 

[hunt-fish.com]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Try hosing down the Carberator with Berrymans B12 spray. Be careful not to get it on any paint. A friend had this same problem on his 4 Winns and it fixed the accelerator pump not doing its job. Otherwise, rebuild just like fone_man said.<br /><br />John<br /> http://www.hunt-fish.com

 

[ODDD1]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

FONEman.. you make me laugh...you dont know squat about volvos....the guy has a SOHC 4 cyl iron block/alum head GENUWINE swedish volvo motor...and a single barrel solex carb...an by the way, it may say 125 on the cam cover, but its only 105hp....yes he probly has to pull the carb apart and scrape all the crud out of it.....beleive it or not, there aint one fuel filter in the whole fuel system...bayliner wanted cheap power to put in these boats, and they got it....

 

[fone_man]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

ODD1.......<br /><br />Trying to do the best with info provide by Kyle & information & sources that I have... glad you showed up since you are now the offical VOLVO expert...<br /><br />I assumed that AQ125 was designation for HP but I guess I made an "ass u me"... LOL<br /><br />Plus I guess we will have to make a bet on Green Bay & Titans game this year or are you another "ravens' fan!!!!! LOL<br /><br />Help him out man...<br /><br />

<br /><br /><br /><br />------------------<br />"Keep It Between The Bouys" & "Good Luck"!!!<br /><br />fone_man

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

ODD1...<br /><br />SO should I just rebuild the carb like foneman said? I took the top off the carb and removed the wire mesh screen, not sure what it is called, and it looked pretty clean. I know absolutely nothing about engines as you can probably tell. I thought about some Gumout, but I will try the spray John recomended also. What do you mean there are no fuel filters? Does this mean no accelerator pump? I'm not following you. Why does the engine say 125 HP when it only puts out 105? Also, d oyou know how high of HP the hull is rated so I could upgrade if I wanted?<br /><br />Thanks for all the help guys.

 

[ODDD1]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Kyle, your problem showing up when the motor is getting worked hard, right? these 125's have had difficulty running well when tubing/skiing.....under hood temps get too high....even if temp guage stays around 180, change the water pump impeller if not done recently.....running the blower all the time will help, too......now, the only mixture adjustment is for idle mixture...if you set it richer it will help the motor accelerate under heavy loads...its near the base of the carb, a slotted head screw.....yes it has an accel pump,with the flame arrestor off you should see it squirting....why do you think they called it a 125??? sounds better than 105, dont it?

 

[page62]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

The AQ125C indicates the model number, not the HP rating. The carb is likely a 1-bbl. Solex (44 PAI or similar). It's just about the simplest carb ever built! I think a monkey could rebuild this one.<br /><br />By the way, although ODDD1 called these "cheap," I'd beg to differ. "Underpowered" is a better term than cheap. But "reliable" and "quality" would also fit in there too. Of course, so would "expensive" as in replacement parts...<br /><br />ODDD1, do you happen to know the fuel line diameter for these engines? I have a similar engine/outdrive, and noticed the lack of a fuel filter. What a crummy way to save a buck!

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

ODD1...<br /><br />The blower isn't working on the engine at this time. I am going to check with the guy I bought it from to see if maybe a wire has come loose from when he installed the radio for me.<br /><br />I am not sure about the water pump impeller either. Do you not think a carb rebuild would help?<br /><br />Also, do you know how high of HP the hull is rated so I could upgrade if I wanted?<br /><br />Anyone else with this boat that could help would be appreciated.

 

[ODDD1]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Naughty, naughty, KYLE, using a inboard engine without a working blower is asking for trouble of the worst kind...these boats burn very well, I have seen it happen....<br /> do the carb and the impeller, and chalk them both up to maintenance...<br /> a power increase is a problem...these are transom hung engines, and little else will bolt in....at one time a dual carb kit was offered aftermarket, but cost was prohibitive for the lousy 20hp it gave...if your not happy, sell it an buy something with more power....<br /><br />page62...99% of trailerable I/O boats have 3/8" [ID] fuel line from engine to fuel tank...a spin on canister style fuel filter mounted in this line is an excellent choice....and yes a drunk monkey can put one of these together!<br /> it may sound horrible, but we would laugh at part prices on these units...comparable part on a merc, multiply by 3 an you got volvos price....

 

[page62]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Thanks ODDD1, you're right about the parts. For example, who ever heard of a $29 radiator cap???<br /><br />Kyle, DO NOT RUN YOUR BOAT UNTIL YOU FIX THE BLOWER! You can take a lighted match and drop it onto 5 gallons of gas...nothing happens. But take a small spark and a few gas fumes...KABOOM!<br /><br />Also, replace the impeller now. <br /><br />Sorry to sound preachy, but there are a few "non-negotiables" when it comes to being a sensible boat owner.

 

[page62]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

By the way, if you ever want more HP, sell the boat you have and use the cash to buy a boat with a bigger engine. "Upgrading" is not cost-effective in the boating world.

 

[hunt-fish.com]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

Lighten up guys! He needs some help! There should be a boiler plate that says what the max HP and man loading is, Usually near the console and sometimes near the back engine compartment. What's up with this impeller stuff? Enverybody is saying replace the impeller! I say if the water pump is working and the unit is cool turn the radio up and move the thottle to WOT!!! The fuel problems are usually related to old gas left over winter. I've been neglegent and done that many times. Cleaning the carb with B12 or Marvel mystery oil and not jacking with it is a very good plan. If someone has been tweeking it then you need to set the factory settings and go from there. The blower does need to work. Try removing the engine cover and run it on the water under normal conditions. No Blower is necessary if you do this and if it mis-behaves let us know.<br /><br />John<br /> http://www.hunt-fish.com

 

[hondon]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

A drunk monkey could sure do this carb rebuild, but a Harvard grad would have a hard time getting the right kit. Go to a dealer that does Volvo every day and be prepared to give them lot of info including serial #S and you already have model.Ask for the big shot parts man or the tech.

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

OK. I finally got in touch with the guy I bought the boat from. He just replaced the water pump impellar, so that definately isn't a problem. As far as the blower goes, I know I should have looked at it before and tried to do somethinw with it, but I just wanted to get it out so bad since I haven't really had it that long. I really appreciate everyones help since I probably don't even know as much as that monkey that can rebuild my carb. Do you guys mind if I borrow him for a bit?<br /><br />Anyways I hope to get some of that carb spray this week and test everything. I heard back from a guy who just went throught this with his '85 Bayliner. He told me to clean off the accererator pump with oenetrating oil (?) and physically pump it through it's range. Then check to see if it is actuating while accelerating and rebuild/replace if not.<br /><br />I also plan to find the problem with the blower. Hopefully it is just a wire that has come loose. I will also check the settings on the carb and see if it could be a bit richer. I guess richer would mean turn the screw to the right more...lefty loosy, righty tighty? If not, let me know. Thanks again.

 

[Kyle Chism]

Re: 125 HP Volvo Penta I/O stalls/hesitates when accelerating

I just found a repair manual manufactured by SOLEC. Volume I covers all models including single prop and duo prop-1968 through 1991. Volvo in-line, OHC and DOHC engines, also US V6 & V8 engines. Over 535 pages, 1380 illustrations.<br /><br />Has anyone used/owned one of these? Do you think it would be helpful with perhaps showing an ignorant person how to rebuild a carb? I think it may help, but if there is a lot of jargon I wouldn't understand, then it is pointless. Can I get it at say Autozone or any marine shop?