Lake Engine Restrictions: Two-Stroke Bans, Horsepower Limits, Electric-Only and No-Wake Lakes

Before checking any lake, write down:

• Make, model, horsepower and year. These are on the engine's ID plate (usually on the clamp bracket or transom bracket). Our engine ID guide shows where to look.
• Two-stroke or four-stroke. If you mix oil in the gas or fill an oil tank for injection, it's a two-stroke.
• Carbureted, EFI or direct injection (DFI). Your owner's manual or dealer can confirm. Lakes that ban "carbureted two-strokes" usually still allow direct-injection two-strokes.
• Emission labels. Many engines carry an EPA emission label and, on engines sold in California, a star-rating hang tag or label. Take a photo; inspectors may ask.
• Any second motor: kicker, trolling motor, or the dinghy outboard.

Lake Tahoe is the best-known engine ban in the U.S. According to the Tahoe boat inspection program's FAQ:

• The Tahoe Regional Planning Agency prohibits launching and using most carbureted two-stroke engines on Lake Tahoe and the surrounding lakes in the region.
• Direct fuel-injected (DFI) two-strokes are allowed, as are engines certified to California Air Resources Board 2001 or EPA 2006 standards. Examples the FAQ lists: Evinrude E-TEC, Mercury Optimax, Yamaha HPDI, and Nissan/Tohatsu TLDI.
• If you're not sure about your engine, the FAQ gives a TRPA contact to ask.

The rule took effect June 1, 1999 (California Attorney General, 1999). So an older carbureted two-stroke outboard or PWC can't go on Tahoe, even if it runs perfectly.

Engine rules rarely come alone. At Tahoe (FAQ, October 2026):

• A 600-foot no-wake zone around the whole shoreline: 5 mph or less within 600 feet of shore. The FAQ's trick for judging the distance: idle out from shore for about 90 seconds.
• Mandatory inspection for every motorized boat (including hand-launched electric craft like eFoils), and since 2025 decontamination for motorized and trailered boats without a valid Tahoe seal, because of the threat from invasive golden mussels. There are fees.

Our watercraft inspection station guide explains what to expect and how to arrive clean, drained and dry.

Ohio's Department of Natural Resources publishes a statewide list that shows how varied the rules can be on lakes in a single state:

• No motors: a few lakes allow no motorized boats at all (some allow only non-powered sailboats).
• Electric motors only: dozens of lakes and reservoirs.
• Under 10 hp (4 hp and 6 hp limits), 10 hp, 20 to 25 hp, and even 250 to 400 hp caps on some larger lakes.
• On some 10 hp lakes, bigger motors are allowed if run at idle/no-wake.
• No-wake lakes, some of which apply only to boats over 10 hp.
• And a group with no horsepower restriction.

ODNR warns the list is not complete: there are hundreds of other waters where the local agency sets its own rules, and it advises checking with the local city, township or county. Expect the same kind of patchwork in other states.

"Electric only" usually means an electric outboard or trolling motor, and many lakes also require no-wake speed. Before you go:

• Read whether the gas outboard must be removed or just tilted up and not used. Rules differ; some lakes don't allow a gas motor mounted at all.
• Example (Pennsylvania, rule read October 2026): on lakes owned or controlled by the Pennsylvania Fish and Boat Commission and on State Park lakes, electric motors are allowed where boating is permitted, but boats running on electric motors may go no faster than slow, no-wake speed. A gas motor attached to or installed in the boat doesn't have to be removed, but running it is prohibited (58 Pa. Code 107.2). Where a lake also has a horsepower limit, the electric motor can't exceed that limit or its equivalent kilowatt rating. Other states and lake owners write this differently, so read the rule for the lake you're heading to.
• Make sure your battery can get you back. Plan for wind and a full day; our electric outboard guide covers battery care and range.
• Some lakes allow no motors of any kind, not even electric.

A no-wake rule means slow enough that the boat isn't creating a wake, usually idle speed. Watch for:

• Lake-wide no-wake (common on small lakes and drinking-water reservoirs)
• Shoreline zones (Tahoe's 600 feet is one example; distances vary by state and lake)
• Zones around piers, ramps, swim areas and marinas, often on local ordinance signs at the launch
• Time-of-day rules on some lakes (for example, no high speed in the evening or early morning)

In this order:

1. The agency that manages the lake. State park, regional authority, water utility, county park district, Corps of Engineers project office, or lake association. Search "[lake name] boating rules" and look for a .gov or official site.
2. Your state boating agency's lake list, if it has one (Ohio's is an example).
3. Local ordinances. Wisconsin's DNR tells boaters to check for a sign at the public landing before boating on unfamiliar water, because local rules may be stricter than state law.
4. Call. Ask: engine type limits, horsepower limit, electric only, speed or no-wake rules, permits, inspection or decontamination requirements, hours and fees.

Write it down with the date you checked. Rules and inspection programs change, sometimes mid-season.

Even after checking online, read the sign board at the launch. It's often where local no-wake ordinances, AIS rules, ramp hours and closures show up first. If the sign and the website disagree, follow the stricter one and ask the managing agency.

Options owners use:

• A small kicker or portable outboard under the horsepower cap (see our kicker bracket and portable outboard guides)
• An electric trolling motor big enough to move the boat, with a fully charged battery
• A second, smaller boat (jon boat, kayak) for electric-only waters

Check whether the lake measures the limit by the motor's rated horsepower (on the ID plate) and whether a bigger motor may stay on the transom unused.

If you boat on restricted water, factor the rules into a repower:

• A four-stroke or direct-injection two-stroke avoids most two-stroke bans.
• A horsepower cap on your favorite lake may make a smaller main engine, or a kicker, the smarter buy.
• Electric outboards keep improving and open up electric-only lakes.

Our repower and two-stroke guides have more detail.