She's In! Now some questions

[BRIELLY]

I finally got my boat in the water today. At first we maxed out at 14 mph, but after 5 minutes all of a sudden it surged up to 26 mph. My guess is there was some junk in the carbs that needed to get cleaned out. What kind of speed should I expect from this boat with a 135 hp merc v6?

[tsubaki]

Sounds more like possible fouled plugs that finally straightened out.
Not sure what a 135 should do.

[CaptJJ]

I agree with Tsubaki check your plugs. When was the last time the boat was run? how old is the gas? was it treated before it sat? is there a water seperator anywhere that you can change and there is probably a filter under the hood the motor somewhere. I wouldn't be expecting any major speed with a 135 but the good news is better gas mileage.

Good Luck

[Mac_Attack]

Were you at full throttle? My guess would be 30 to 35, 1 or 2 normal weight people. Not like MJ or myself, and not a full tank of gas. Good Luck with her. Billy Mac :beer:

[randlemanboater]

I would think around 35 mph light, like Mac said.

Get you some new plugs and give it another shot.

[tsubaki]

I can't remember what the speed on mine was while Granddaddy and then Daddy owned it.
Seems like the 125 did near 25 and the 140 did under 35.

[BRIELLY]

That was the first time it ran in 3 years. I changed the fuel filters, new gas (full tank) new plugs. Compression was an even 100 psi tested cold so I'm thinking its just needs to be cleaned out or possibly an adjustment to the timing/sync. since i don't know when that was done last. I'm just glad it ran at all.

[randlemanboater]

One of the Merc experts will be along soon to help you out.

[willy]

dont know what year she is but at some point the manufactures stopped measuring at the crank and started measuring at the prop first of all. With 130 at the prop assuming it is propped right(what rpm were you hitting max) you should be in the 32-35 range.
If it measured on your engine at the crank then you should good running to be high 20's.

[steplift20]

i cant understand how my friends out there go 40 mph i have a 150 and top speed is about 32 thats with the right prop but i do carry alot of weight 4 grown ups ice tackle lunch

[tsubaki]

I get 41-42 and still ain't turn'in the correct rpms.
Only around 5100.

[THEFERMANATOR]

Did you pull the carbs and clean em? If not do so soon. 3 years will have alot of gunk in them if they sat with any fuel at all in them. Also check to make sure your timing is advanceing properly. The MERC's are known to not reach full timing once they have sat for awhile. The plastic on the pickup harness gets hard and will prevent it from advanceing all the way. Make sure all of your linkage is clean and free and well lubricated, put some new plugs in it, and make sure the carbs are clean.

The 135 is the same engine as a 150 internally, just different carbs. And a 135HP should be propshaft rated as they didn't come out until the mid 80's when they switched the rating's. An early 80's 150 became a 135 in the mid 80's, and the 175 became a 150. The top end numbers should be pretty close to that of a 150 as that 135 has good torque for it's size. Make sure you hit the right RPM's at WOT as they are affected by propping and engine height fairly easily.

[tsubaki]

Nice havin a Merc God around,
AIN'T IT?? :clap:

[BRIELLY]

I didn't clean the carbs so I guess I'll give that a shot. Do I need to take them apart or just blast the insides with carb cleaner? The engine is a 91 btw. I was at 3000 rpm's at 14 mph but the tach died before I could get it up to speed. I guess it got into the 5000+ range at WOT.

[THEFERMANATOR]

It's always best to pull them off to clean them, but at the minumum remove the brass drains from the carbs and spary carb clenaer through the jet inside. If you see any green or black build-up on the brass drain screws, then you really should pull the carbs apart and thoroughly clean them. BS is ALOT better on the MERC's than I, but I tend to get by with all engines:fam:. A timing light and a few other tools is all that is really needed to do MOST repairs on that engine. Them old 2 strokes may drink gas, but at least you don't need a $3500 laptop with all of the software to work on em.