- Messages
- 13,377
- Reaction score
- 13,500
- Points
- 857
- Location
- Royal, AR
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 23
I replaced the bunks on my Yamaha SX230s galvanized trailer today.
I used twenty 3/8 x 1 1/2 galvanized lag bolts and washers, 3 x 10 foot 2x6s, 300 stainless steel staples a can of marine spray glue and 32 feet of bunk carpet.
I used a 1/2 inch cordless impact to remove the old rusted lag bolts. Then I laid each of the old bunks beside its original location to use it as a guide to line up the new.
The factory uses two 10 foot and two 5 foot bunks. I cut one of the 2x6s in half to make the 5 foot lengths. My bunk carpet was in 16 foot sections. I cut off 5.5 feet. Then I applied marine spray glue to the entire backside of the carpet. I laid the 2x6 on the glue centering it as well as I could. I walked on the 2x6 to try to press it down into the glue. I then stapled the end pieces down followed by the sides. I repeated this for each of the four bunks.
Then I took each new bunk and used the old as a reference for mounting. I placed the bunk on the mounts and drilled a 5/16 hole through the mount at one end and installed a lag bolt. The factory did not use washers, I decided to. Then I moved to the opposite end, drilled a hole and installed the lag bolt and washer. This had the bunk held in alignment so I preceded to drill and install the remaining lag bolts. I verified that each bolt remained tight after installing neighboring bolts. I repeated this process for the remaining bunks.
The cost of materials was around $70. If I had bought the supplies ahead of time it would have been less than a two hour job.
I debated what kind of lumber to use and finally decided on quality spruce with few knots and kiln dried.
Here are pictures of the new bunks.
I used twenty 3/8 x 1 1/2 galvanized lag bolts and washers, 3 x 10 foot 2x6s, 300 stainless steel staples a can of marine spray glue and 32 feet of bunk carpet.
I used a 1/2 inch cordless impact to remove the old rusted lag bolts. Then I laid each of the old bunks beside its original location to use it as a guide to line up the new.
The factory uses two 10 foot and two 5 foot bunks. I cut one of the 2x6s in half to make the 5 foot lengths. My bunk carpet was in 16 foot sections. I cut off 5.5 feet. Then I applied marine spray glue to the entire backside of the carpet. I laid the 2x6 on the glue centering it as well as I could. I walked on the 2x6 to try to press it down into the glue. I then stapled the end pieces down followed by the sides. I repeated this for each of the four bunks.
Then I took each new bunk and used the old as a reference for mounting. I placed the bunk on the mounts and drilled a 5/16 hole through the mount at one end and installed a lag bolt. The factory did not use washers, I decided to. Then I moved to the opposite end, drilled a hole and installed the lag bolt and washer. This had the bunk held in alignment so I preceded to drill and install the remaining lag bolts. I verified that each bolt remained tight after installing neighboring bolts. I repeated this process for the remaining bunks.
The cost of materials was around $70. If I had bought the supplies ahead of time it would have been less than a two hour job.
I debated what kind of lumber to use and finally decided on quality spruce with few knots and kiln dried.
Here are pictures of the new bunks.
. I put the UBBs on (without carpet) and a few weeks later took a long trip up North with the boat. My Gelcoat started melting around the contact points between hull and UBB from what I believe to be small movements in the boat going over potholes and such. Any kind of dust or dirt would cause a sand paper action between the two hard surfaces. My bowstop was welded and I had boat buckles tight on both the bow and stern so the boat was as tight as could be, however I still think large bumps cause a tiny shift between hull and bunk. I put the carpet over the UBBs because I believe it acts like a buffer to the sand and dirt that might reside on the bunk surface.
