---
product_id: 9236640
title: "Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004"
brand: "spm"
price: "A$147"
currency: AUD
in_stock: false
reviews_count: 5
url: https://www.desertcart.com.au/products/9236640-scooter-big-bore-150cc-to-170cc-cylinder-head-gy6-157qmj
store_origin: AU
region: Australia
---

# 90mm cylinder height High-performance CDI 150cc to 170cc boost Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004

**Brand:** spm
**Price:** A$147
**Availability:** ❌ Out of Stock

## Summary

> 🏁 Elevate Your Ride: Experience the Thrill of Performance!

## Quick Answers

- **What is this?** Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 by spm
- **How much does it cost?** A$147 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/9236640-scooter-big-bore-150cc-to-170cc-cylinder-head-gy6-157qmj)

## Best For

- spm enthusiasts

## Why This Product

- Trusted spm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Comes equipped with performance springs, retainers, and keepers for durability and reliability.
- • **Unleash Your Ride:** Transform your scooter's performance with a powerful 150cc to 170cc upgrade.
- • **Smooth Performance:** Includes a high-performance variator set with copper rollers for seamless acceleration.
- • **Precision Engineering:** Crafted with a 90mm cylinder height for optimal airflow and efficiency.
- • **Rev Up Your Experience:** No Rev Limit Performance CDI ensures you push the limits without restrictions.

## Overview

The Scooter Big Bore 150cc to 170cc Cylinder Head is designed for GY6 157QMJ engines, enhancing performance with a 90mm height, high-performance CDI, and a complete variator set. This upgrade is perfect for riders seeking to maximize their scooter's potential.

## Description

Comes with cylinder, 61mm piston, clips, piston pin, head gasket and base gasket, head Big valve non emissions head Head comes with performance springs, retainers and keepers intake valve is 27mm, exhaust is 23mm Performance Performance Muffler exhaust 100x420MM for GY6 150CC included GY6 engine and 152QMI engine 152QMI /157QMJ, ATV, Quads, Buggies & Scooters Overall Height (cylinder) is 90mm High Performance Variator Set with copper Rollers - 14g No Rev Limit Performance CDI, 2 plug 6 pin, 38mm*74mm*30mm

## Features

- Overall Height (cylinder) is 90mm
- High Performance Variator Set with copper Rollers - 14g
- No Rev Limit Performance CDI, 2 plug 6 pin, 38mm*74mm*30mm
- Head comes with performance springs, retainers and keepers intake valve is 27mm, exhaust is 23mm

## Images

![Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 - Image 1](https://m.media-amazon.com/images/I/615TLswiLVL.jpg)
![Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 - Image 2](https://m.media-amazon.com/images/I/61hY4J7hqqL.jpg)
![Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 - Image 3](https://m.media-amazon.com/images/I/615dscNa0LL.jpg)
![Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 - Image 4](https://m.media-amazon.com/images/I/61+uFfDhXOL.jpg)
![Scooter Big Bore 150cc to 170cc Cylinder Head Gy6 157qmj Performance Exhaust #99004 - Image 5](https://m.media-amazon.com/images/I/61UPJBb-jKL.jpg)

## Customer Reviews

### ⭐⭐⭐ 







  
  
    yes the roads here is that bad.
  

*by K***G on Reviewed in the United States 🇺🇸 on February 27, 2015*

the cylinder i got seems to be made to use a small stroker crank.at tdc the pistion is about 1.5mm from the deck height. but i got 65 mph with the low compression and 87 pump gas. the header broke at the support bracket after 3 weeks of riding. scoot is used as a go to work transportation about 30 miles round trip 6 times a week on honolulu roads... yes the roads here is that bad.

### ⭐⭐⭐ 







  
  
    Worth it but the exhaust is too long and heavy ...
  

*by J***E on Reviewed in the United States 🇺🇸 on September 30, 2014*

Worth it but the exhaust is too long and heavy, you'll have to have brackets fabricated and welded at muffler shop.

### ⭐⭐⭐⭐⭐ 







  
  
    a really good power upgrade kit and well made for the money. best I've seen.
  

*by B***N on Reviewed in the United States 🇺🇸 on March 1, 2015*

Everything came in one box and packaged nicely. Don't see any way it could possibly get damaged in transit. It was well thought out. Everything was as posted. I say everything was really good quality and that it was way better than stock items and added a lot of power. The machining of the block wasn't to bad. The only complaint I have is.the mufflers a hair long but not bad. It sounds great too. Believe me. I don't normally leave feed back but I had to on this one.

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**Shop now:** [https://www.desertcart.com.au/products/9236640-scooter-big-bore-150cc-to-170cc-cylinder-head-gy6-157qmj](https://www.desertcart.com.au/products/9236640-scooter-big-bore-150cc-to-170cc-cylinder-head-gy6-157qmj)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-23*