# Pitster Pro - MXR 90 SS Semi-Auto E-Start > This is a plain-text (markdown) copy of a page on tboltusa.com, made for AI assistants. People see the same page at the HTML link below. - **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Pit Bikes](https://tboltusa.com/store/pit-bikes-c-46.md) > [Pitster Pro Pit Bikes](https://tboltusa.com/store/pit-bikes-pitster-pro-pit-bikes-c-46_63.md) > Pitster Pro - MXR 90 SS Semi-Auto E-Start - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/pitster-pro-mxr-90-ss-semi-auto-start-p-1689.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/pitster-pro-mxr-90-ss-semi-auto-start-p-1689.md) - **Generated:** 2026-11-08 13:09 EST - **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt) - **Your list:** To list everything you have looked at in one page, with current prices and stock, add ids to this address (comma separated, up to 20 of each): `https://tboltusa.com/store/seen.md?p=1689` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TRC-1689 - **Price:** $1,499.99 USD (before options) - **Stock:** 4 left. - **Product id:** 1689 - **Product last changed:** 2026-08-27 ## Options This product has options. Pick one value for every option. A value marked +$X adds that amount to the price; -$X takes it off. ### Shipping The "Shipping" option is this heavy item's own flat shipping fee; it is added to the item. - Flat Rate: +$350.00: `choice/8-26` ## What it fits The store lists a part under each bike or engine model it is meant for (the categories below) and may name models in the description. Do not assume it fits a bike or engine that is not named here; ask the store first. - [Pit Bikes > Pitster Pro Pit Bikes](https://tboltusa.com/store/pit-bikes-pitster-pro-pit-bikes-c-46_63.md) - [Pit Bikes > Play Bikes](https://tboltusa.com/store/pit-bikes-play-bikes-c-46_614.md) Where a fitment line says "All", it means all years of the model named on that line, not all bikes. ## Notes the store shows with this product ****OFF ROAD USE COMPETITION ONLY THIS IS A COMPETITION USE MOTORCYCLE AND IS INTENDED FOR OFF-ROAD USE ONLY**** **EVERY Pitster we sell is The Latest Version and Brand New with all of the latest upgrades** Excited about getting your bike, and setting it up? Check out the **[Pit Bike Shipping Info](http://tboltusa.com/store/tech.php?pID=66/Pit+Bike+Shipping+INFO)** and **[Pit Bike Set Up Info](http://tboltusa.com/store/tech.php?pID=67/Pit+Bike+Set+Up+INFO)** in our Tech Database to get an idea of how quick and painless the process is. ## Description (the store's own text) Competition stock class racer! Bring on the MINI MOTO IN VEGAS cause the MXR 90 SS is perfect bike to bang bars in the 10 inch stock class or rip around the back yard track! Its got 4 gears of fun just waiting to be unleashed. Complete with big boys race bars and heavy duty foot pegs the MXR 90 SS is ready to race! Easy four stroke semi auto operation for the young riders and electric start, the MXR 90 SS is the perfect combination to build confidence and take your skills to the next level. Bike Model - Model:: MXR 90SS - MSRP:: $1299.99 CHASSIS AND DIMENSIONS - Color:: Gray - Curb Weight:: 110 lbs - Frame:: Chromoly - Fuel Capacity:: 0.79 Gallon - Ground Clearance:: 7" - Seat Height:: 23" - Subframe:: Fixed, Chromoly - Swingarm: - Wheelbase:: 37" WHEELS AND TIRES - Front Tire:: 2.50 x 10" - Front Wheel:: 1.40 x 10" - Rear Tire:: 2.50 x 10" - Rear Wheel:: 1.40 x 10" BRAKES - Front Brake:: Hydraulic disc - Rear Brake:: Hydraulic disc - Rear Pedal:: Steel under the peg SUSPENSION - Front:: Conventional telescoping oil fork - Rear:: Oil shock w/ adjustable preload - Travel:: 3" Front / 3" Rear ENGINE - Bore and Stroke:: 47mm x 49.5mm - Clutch:: 5 Plate wet clutch - Cooling:: Air cooled - Engine:: 4-Stroke Lifan 88cc - Gearing:: 420/ 14T x 37T - Ignition:: Stator/ CDI with lighting coil - Starter:: Kick & Electric - Transmission:: 4 Speed semi-auto clutch ## More notes the store shows with this product **IMPORTANT ENGINE STARTING INFORMATION** - You may want to consider setting up the bike on a stand for a solid starting location at first until your confident - Turn on Both Fuel and Choke - DO NOT open the throttle (do NOT turn the throttle) - Move the starter down until it gets stiffer, your looking for top dead center - Let the starter come back up and give a full strong swift kick ALL the way thru - REPEAT (If necessary) - DO NOT KICK RAPIDLY - When warm just do not use the choke Flooded Engine: IF your flooded , pull the plug, kick it over about 10 times WITH THE PLUG OUT Put in a NEW PLUG For ease of starting: You may want to consider our TRC EZ START HIGH PERFORMANCE CDI Part No. TRC-9745 (NOT FOR USE ON ZS190s) One more thing: At times it helps to just crack the throttle a *tiny* bit to let air in. ## Tech articles for this product The TBolt USA Tech Database is the store's free online library of pit bike technical info. The articles below are linked from this product's own page. - [Pit Bike Shipping INFO](https://tboltusa.com/store/pit-bike-shipping-info-tech-66.md) - [Pit Bike Set-Up Info](https://tboltusa.com/store/pit-bike-set-up-info-tech-67.md) ## Shipping and returns - Flat rate shipping is $8 for parts orders under $75 and free for most parts orders over $75, within the continental 48 states. Heavy items (engines, complete bikes, suspension) are excluded. - This item ships with its own flat fee: $350.00 USD. - Full shipping policy: [Shipping policies](https://tboltusa.com/store/shipping-policies-i-6.md) - Returns: the store's own policy page says how returns, exchanges and cancellations work. Please read it before buying: [Returns, Exchanges and Cancellations](https://tboltusa.com/store/returns-exchanges-and-cancellations-i-11.md) The page begins: "All products returned to T Bolt USA must be reviewed and approved." ## How to buy For a person: open [Pitster Pro - MXR 90 SS Semi-Auto E-Start](https://tboltusa.com/store/pitster-pro-mxr-90-ss-semi-auto-start-p-1689.html), choose any options, press "Add to Cart", then check out from the cart. Payment is only ever entered by the person, on tboltusa.com's own checkout pages. For an AI assistant building a cart: `https://tboltusa.com/cart/new/item/1689/choice/8-26/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/1689/choice/8-26/qty/1` adds it to a cart you already started, and `https://tboltusa.com/cart//zip/` gives the shipping options to a US ZIP code. They answer JSON: give your customer the newest `cart_link`, a public cart link, safe to share. To choose other values, swap in a `choice/` piece from the Options above; `qty/` sets the quantity. More products: add more `item/...` parts. Or give the person one link that fills their own cart when they open it (a public cart link, safe to share; the first value of every option, qty 1): [Put Pitster Pro - MXR 90 SS Semi-Auto E-Start in my cart](https://tboltusa.com/cart/open/item/1689/choice/8-26/qty/1) Payment: all major credit cards, PayPal, Apple Pay and Google Pay. Money orders by arrangement. Cart: [Shopping cart](https://tboltusa.com/store/shopping_cart.php) ## Photos - [Photo 1](https://tboltusa.com/store/img/p/1689/pitster-pro-mxr-90-ss-semi-auto-start-1.jpg) - [Photo 2](https://tboltusa.com/store/img/p/1689/pitster-pro-mxr-90-ss-semi-auto-start-2.jpg) - [Photo 3](https://tboltusa.com/store/img/p/1689/pitster-pro-mxr-90-ss-semi-auto-start-3.jpg) - [Photo 4](https://tboltusa.com/store/img/p/1689/pitster-pro-mxr-90-ss-semi-auto-start-4.jpg) - [Photo 5](https://tboltusa.com/store/img/p/1689/pitster-pro-mxr-90-ss-semi-auto-start-5.jpg) ## Support Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online [Pit Bike Technical Info Database](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)! We have all necessary support parts on hand. *Most* orders ship same, or next business day, unless otherwise noted above.