Bog issue

« **on:** February 21, 2015, 08:10:59 PM »

Have a carb issue. Last season rippin around in my sanger seemed like it would run great but if I wanted to do a pass from a dig it would bog for a sec then go. 468 bbc high rise dual plane intake its got the good stock oval port heads mystery cam.. marine 750 holley vs's has #25 squirters pump cam looks to be white? Pulled the spring out of the secondary diaphragm housing. The check ball is not in there. And it had a plain spring I threw a yellow spring in it. And buttoned it back up. Anyways question is do you guys think it is a primary side issue like cam or squirter issue or vacuum secondary issue where the secondaries are not opening up right away?? I dont see any black smoke out the stacks.

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« **Reply #1 on:** February 21, 2015, 08:57:50 PM »

I would put at least a 35 squirter in it to start with. Most likely that will help, 25 is way to small. But every motor is different. You might need 50cc accelerater pumps.

« **Reply #2 on:** February 21, 2015, 09:09:56 PM »

Where is your timing at and at what curve?

GT

« **Reply #3 on:** February 21, 2015, 10:12:29 PM »

Gt, Timing is at 36. And like a idiot I totally looked over the curve. I will have to look at it and get back on that..might be a while since the boat is winterized at this point. Yellow jacket, so I though the smaller the number the longer the nozzle sprays? And the bigger the shorter but more fuel? Also what ever we figure out I am going to a tube style nozzle. What pump is in it now prolly a 30?

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« **Reply #4 on:** February 21, 2015, 10:20:36 PM »

get a rough idea what my curve should look like? Start to come in at about 1500 rpms? And full by 3 3500? Should I pull the cover and see what cam I have?

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« **Reply #5 on:** February 21, 2015, 10:54:45 PM »

Should be all in at 2,500 RPM.

A jet boat engine does not have to pull a load. The engine does not have much to do at anything below about 3,500 RPM, the timing can come in as quick as you want really. A lzy curve will make it mushy, but should not Bog.

GT

« **Reply #6 on:** February 21, 2015, 11:29:43 PM »

10-4 so are you leaning towards a carb tuning issue?

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« **Reply #7 on:** February 21, 2015, 11:37:34 PM »

Quote from: boatsnores on February 21, 2015, 08:10:59 PM

Have a carb issue. Last season rippin around in my sanger seemed like it would run great but if I wanted to do a pass from a dig it would bog for a sec then go. 468 bbc high rise dual plane intake its got the good stock oval port heads mystery cam.. marine 750 holley vs's has #25 squirters pump cam looks to be white? Pulled the spring out of the secondary diaphragm housing. The check ball is not in there. And it had a plain spring I threw a yellow spring in it. And buttoned it back up. Anyways question is do you guys think it is a primary side issue like cam or squirter issue or vacuum secondary issue where the secondaries are not opening up right away?? I dont see any black smoke out the stacks.

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Which yellow spring? there are two.... You should be using either the white one or the short yellow one.

Sounds to me like you need a more aggressive pump cam and potentially a wee bit more pump volume. Do you know what power valve you have?

GT

« **Reply #8 on:** February 21, 2015, 11:56:10 PM »

Had the stock plain spring i put in the Short yellow spring. I have not pulled the bowl off yet I will tomarra and see what power valve and jets are in it.

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« **Reply #9 on:** February 22, 2015, 10:11:27 AM »

I have seen alot of guys that seem to like the pink cam on similar engines.

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boatsnores

Bog issue

YellowJacket

Re: Bog issue

GT Jets

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boatsnores

Re: Bog issue

boatsnores

Re: Bog issue

GT Jets

Re: Bog issue

boatsnores

Re: Bog issue

GT Jets

Re: Bog issue

boatsnores

Re: Bog issue

boatsnores

Re: Bog issue