AP Custom and Precision LLC

AP Custom and Precision LLC Powersports service from tuneups, machining, engine rebuilding and performance parts

Beginning with a hand-me-down snowmobile, the passion for motor-sports industry was born. Continuing through several self-owned performance build and years of excellent mentoring, life brought me to Wisconsin where AP Custom and Precision LLC was founded.

This is a recent Seadoo 717 (720) engine rebuild for Sport Spec racing in Great Lakes Watercross Group. Excited to see...
03/13/2026

This is a recent Seadoo 717 (720) engine rebuild for Sport Spec racing in Great Lakes Watercross Group. Excited to see another engine on the line!

This week we got caught up on rebuilding some Polaris 350L 400L 400 crankshafts commonly found in Scrambler Big Boss and...
01/25/2026

This week we got caught up on rebuilding some Polaris 350L 400L 400 crankshafts commonly found in Scrambler Big Boss and other 90’s Polaris atv’s. These were set with new WSM connecting rod kits and All Balls man bearings. We true our cranks to ensure long term reliability.

If you need engine parts rebuilt or refurbished contact us today or fill out a work order form at https://www.getapcustom.com/work-order-form

Have you ever wondered how many cylinders we have done? Well we often wonder that too but sooner of the evidence that ...
09/20/2025

Have you ever wondered how many cylinders we have done? Well we often wonder that too but sooner of the evidence that left behind can give you some idea.
Yes those are full 5 gallon buckets of machining shavings!

We also resleeve cylinders (several boxes of crushed sleeve material)

09/10/2025

Measuring runout on a Seadoo 717 crankshaft the more accurate way - exhibiting even more excessive runout than previously shown.

09/09/2025

This level of runout on a crankshaft (especially one that is supposedly trued and welded) is unacceptable.

Knocking out another crank rebuild for another Seadoo 717 engine. We stock all components for rebuilding your engine p...
08/28/2025

Knocking out another crank rebuild for another Seadoo 717 engine. We stock all components for rebuilding your engine properly - new crankshafts or rebuild parts for your crank, ready to go refurbished cylinders or we can bore yours, gaskets, RV resurfacing, and more! Fast turn around - contact us today.

Recently had a customer who said his ski “gulped some water” and was redoing his engine . Out of precaution he decided...
07/28/2025

Recently had a customer who said his ski “gulped some water” and was redoing his engine . Out of precaution he decided to pull the crank out and it’s a good thing he didn’t just do the top end. The connecting rod was a little less than straight! This is what a hydro lock can do.

If you are rebuilding a Seadoo 787 (800), don’t forget an important step by having the counterbalancer rebuilt. This i...
06/19/2025

If you are rebuilding a Seadoo 787 (800), don’t forget an important step by having the counterbalancer rebuilt. This is a critical step to ensure your engine runs smooth and doesn’t have a catastrophic failure down the road. We have them rebuilt and in stock or you can send yours in for us to rebuild.

Our process includes disassembly, inspection cleaning, reassembly and verification of position and indexing.

Another 951 engine rebuilt, Leakdown tested and crated up! Customer dropped it off with a locked up crank. During t...
05/31/2025

Another 951 engine rebuilt, Leakdown tested and crated up! Customer dropped it off with a locked up crank. During the rebuild process we a bit of debris in the bottom end, four crank mains rusted tight, rods with rust pitting, power valves that had been trimmed about 4mm, and carbs with two different springs making drastically different pop off pressures.

This is why it’s we recommend rebuilding your counter balance shaft with new bearings and seals when you rebuild your en...
04/13/2025

This is why it’s we recommend rebuilding your counter balance shaft with new bearings and seals when you rebuild your engine! The CB bearing can lock up and spin in the case. These bearings are suspected to be the original from BRP and ultimately locked up. The engine ran long enough that the balls came out of the bearing and the weight pushed them through the case.

Seadoo 951 Carb model

We just finished up a batch of 2-stroke Polaris ATV cylinders for models including the 250 Trail Blazer, 250 Trail Boss,...
04/10/2025

We just finished up a batch of 2-stroke Polaris ATV cylinders for models including the 250 Trail Blazer, 250 Trail Boss, 300 Xplorer, 400L, Big Boss 400, Sportman 400, and Scrambler 400.

Finishing up some work for the week. Polaris 650 750 780, Kawasaki TS and SC 650, and more!
03/24/2025

Finishing up some work for the week. Polaris 650 750 780, Kawasaki TS and SC 650, and more!

Address

Long Road
Stockbridge, WI
54129

Telephone

+19204390938

Website

http://www.getapcustom.com/

Alerts

Be the first to know and let us send you an email when AP Custom and Precision LLC posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to AP Custom and Precision LLC:

Shortcuts

Share

Category