Yamaha 130 V4 Project Build.

[ultrafast]

I have been cutting on two strokes off and on my whole life and I must say youve got one of the best AND hes an omc guy! Seriously monty has ideas the rest of us would never dream of.

[Mr. Demeanor]

Ray, you know I highly value your input
What is the advantage to the older heads VS. the 115 circa 2002 (I think) heads I have if there going to be cut anyway?

Here are some updated pics. You guys know I am not into and super secret stuff or lying about what I am running.

I did get his permission to post the pics.

[bigbluechevy454]

So is a yammy like a omc? Kinda looks like it

[71V153]

So is a yammy like a omc? Kinda looks like it

Well ya could say they're quite similar ...?

[Mr. Demeanor]

Now don't you fret Chris, sounds like she's in good hands. Mebbe a lil premature but any ETA forecast?

Sadly I lost a cylinder yesterday afternoon. When I came off plane for one of our beloved Manatee zones, it started coming & going. Still hit on all 4 @ higher rpms, then late in the day she gave up.

Gonna check comp tomorrow. Just had the heads decked & replaced the gaskets a few months ago? Ignition/coil mebbe??

Look forward to seeing you'n Flight Risk after the rebuild. Hey been meanin' to ask where ya got your cool lil bow line connector pin thingy. Kin ya get me one?


Doug

Bummer on your motor.
The cleat is a push pin cleat from CP Performance:
http://www.cpperformance.com/p-25622...er-cleats.aspx

[Ray Neudecker]

Awesome work. Going to be a real animal. That will be able to turn up some rpm's and live. If Gordon is doing the heads, it won't likely matter. The old 130 heads on a fresh unported will give you 150 lbs. compression. Close to max for pump gas.
My prediction would be that you will easily break 90 with one of the props you have now.
Good luck and be careful.

[Mr. Demeanor]

My goal is actually to have a safer boat by having more power. I will now be able to run with the groups I run with at a lot safer trim levels. Yes, I will be able to hang it out there when conditions are just right but I will also be able to run 80+ at neutral trim.

[mackeral5]

Looks great. What pistons are you planning to run?

[Mr. Demeanor]

Looks great. What pistons are you planning to run?

Leaving that to Monty but I think he said coated Vertex.

[baja200merk]

Nice work, looks like fun!

Looks identical to an OMC except the casting is 20x cleaner

[mackeral5]

Any piston mods other than the FP holes? Lightening? Trimming the skirts?

[Mr. Demeanor]

Any piston mods other than the FP holes? Lightening? Trimming the skirts?

Its all up to Monty!

Intake side pics. Lots of stuffing. Almost looks as good as the stuffing job I did

Mine and I must say, considering I didnt know what I was doing and did this with the powerhead intact, its not far off (patting myself on the back)

This is the stock intake and then what I did when I stuffed it using PC7.

[Mr. Demeanor]

Monty's work:

[Mr. Demeanor]

I can tell you that when I stuffed my old intake, the results were incredible. I would struggle to get on plane with anything bigger than a 26 pitch prop and after stuffing and rejetting, it popped right up with a 32 pitch. The idle was also more balanced. You can see with the stock intake side the Four cylinders have different volumes. Stuffing made the volume of each very similar and I ended up with the same idle air screw settings on each carb where before they were different port and starboard.

[mackeral5]

Stuffing the intake and front half on the vertical yammie v4 and v6 typically yields the greatest "seat of the pants" performance gain when compared to the other non-grinding, Bolton mods. Good stuff, keep the pics/updates coming.