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GY6 50cc Carburetor Main Jet #78 - Model MIGY50-4084-78

GY6 50cc Carburetor Main Jet #78

  • Brand: Mortch Motor
  • Product Code: MIGY50-4084-78
  • Product Viewed: 113
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  • Availability: In Stock
  • Weight: 0.00kg
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  • US$0.55


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This is a Carburetor Main Jet (M4 x 0.7 thread, 7.2mm length) designed for the GY6 50cc 4-Stroke engine. These come in various sizes depending on your application and tuning requirements.

Thread Size: M4 x 0.7
Length: 7.2mm
Compatible Engine: GY6 50cc 4-Stroke
📊 Jet Size Recommendations
Jet Size Application
#74 Standard replacement with stock air box
#80 Requires Performance Air Filter system
#84 Requires Performance Air Filter system
#86 Requires Performance Air Filter AND Performance Exhaust System for top performance
⚡ Performance Note: Installing a Performance Air Filter and Performance Exhaust System will give you the edge you're looking for. If you increase the size of your stock carb jet, you will want to improve your air flow both in and out of the engine.
🔧 Mechanics Note: For smaller upgrades, replace the stock air filter with a Performance Air Filter for this engine. If you upgrade beyond small adjustments, you will want to install a Performance Exhaust System to handle the increased combustion and minimize back flow issues.
⛰️ Altitude Considerations: Altitude can play an issue in scooter performance. When dealing with elevation, you will want to rejet to prevent your engine from seizing and requiring a rebuild. You will lose about 3% in power for every 1000' in elevation. At 4000' feet you will have lost about 12% of your power output. You will want to go down one (1) jet size for every 1750' to 2000' you go up in elevation. When the air is colder, it requires bigger jets because cold air is more dense. If it is 50 degrees colder, you would increase your jet size at least one step up. If you don't, your engine may seize on you.
🔧 Compatibility Notice
  • Please verify that this part fits your specific vehicle model and year. Many vehicles share similar names but use different components depending on year or market region.
  • We strongly recommend cross-checking with your vehicle's owner's manual or contacting us for confirmation before placing your order.
📄 Product Disclaimer
  • Product images, measurements, and descriptions are for reference only. Slight variations in color or appearance may occur due to manufacturing batches or photography lighting—functional specifications remain identical to the ordered part.
  • Professional installation is mandatory. Mortch Motor assumes no liability for damages, injuries, or losses resulting from improper installation, misuse, unauthorized modification, or abnormal operation.
💰 Import Duties & Taxes
  • All listed prices EXCLUDE shipping costs, import duties, taxes, and customs clearance fees. These charges (if applicable) are determined and collected by your local customs authority and are solely the buyer's responsibility.
  • In case of return due to unpaid duties/taxes or refusal to clear customs, the buyer shall bear the original shipping cost, return shipping fees, and any associated administrative charges deducted from the refund.
📌 Order Confirmation: By completing your purchase, you acknowledge that you have read, understood, and agreed to all terms above. For any questions, please contact our support team prior to ordering.

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