125/150cc Performance

Finally, a truly big valve head for your GY6! This fits the standard and big bores. Hand ported intake and exhaust ports leads to massive valves. Intake is a whopping 30mm, and the exhaust is a giant 25mm! Professional three angle valve seats. All machine work done in-house in USA. We would recommend using this in conjuction with our 30 or 32mm CVK kit and performance manifold. Unheard of price and availability. $149.95 

These are probably the best bang for the buck if your still using those old round rollers in your variator. These will spread the load pressure to help broaden the range of variations as sticking is greatly reduced. So in the end, you will get the performance of a lighter and heavier weight roller, in one package, and last longer to boot. Just as good as Dr. Pulley, but much better price. $19.95 These come in 10g, 12g, 13g, and 15g now.

choose your weight

10g $19.95 12g $19.95 13g $19.95 15g $19.95

Here you go, it's time to get those old rollers replaced, or you've done some modifications and want to get your scoot in tune. Rollers are the way you set the engine speed. Lighter weight raise engine speed, heavier weights lower engine speed. Be careful, higher is not always better as you can rev right past your torque curve and just spin out without any thrust. Too heavy a weight and you will be below your torque curve. These come in 8, 9, 10, 11, 12, 13, 14, and 17g. Quality at wholesale pricing. Only $9.95

choose your weight

8g $9.95 9g $9.95 10g $9.95 11g $9.95 12g $9.95 13g $9.95 14g $9.95 15g $9.95 17g $9.95

This is it folks. Gigantic 115mm drive face, with super steep roller ramps, extended glide rails, neoprene glide bushings, moly coated ramps and plate, and your choice of our quality sliders in 10g, 12g. 13g, or high speed 15g.

choose slider weight

10g $79.95 12g $79.95 13g $79.95 15g $79.95

Cool looking, even better performing, stainless steel exhaust system for your GY6 125,150,200cc scooter/atv/buggy engine. Comes complete with headpipe, large silencer, and all mounting hardware. Works with both the clamp-on and engine tab mounts for single shock systems. This price is lower than most places dealer cost, cause your buying from a direct importer. $149.95 rear disc brake and 2 shock models may require slight modifications

Short slash cut, shark tip,  stainless exhaust system for your short case 125/150. Exhaust canister is 340mm long (under 14in) and would look great on a retro type scoot. Works with both clamp-on and engine tab mounts for single shock systemsLimited introductory rate: $139.95 rear disc brake and 2 shock models may require slight modifications

Name: This is a genuine perforamance drive belt with Aramid ( like Kevlar ) for the long case scooter/atv engine. This is printed as an 835-20-30, but is also a direct replacement for the 842-20-30. We also have the 743-2-30 belt for the short cases like small wheel scooters, and ATV's. These are virtually indestructable and last a long time. Keeps you wallet in good shape too at only $34.95

choose your size

835 long case $34.95 743 short case $34.95

Scrap that limited stock CDI and drop in this unlimited performance CDI with no governer, and an advanced spark timing. This will increase acceleration and top speed by 5-10%, if all else is well. No guarantees on performance parts as this will not improve power if your engine is not running well to begin with. This is plug and play for GY6 scooter atv 50, 125, 150 engines in 152QMI, 152QMJ, 157QMI, 157QMJ, 139QMB 4strokes. If you have this connector and have an AC fired system, it work. See Tech Talk with MO! if your not sure. This is by far the lowest price unit on the market. $19.95

This is the hard to find performance CDI for your DC fired system. These are found on the Kymco Agility 50 and 125cc, Diamo Velocity, Vento Triton, SYM VS 125, VMOTO 125cc Monaco, Schwinn, Tomos Nitro 50, Eton sport 50, SYM sport 50, gy6 150cc JCL-MD150 (vespa like), similar to Flyscooter La Vie, Lance Milan, BMS Evo9, Lance GSR-150 ,and other high end Chinese, Korean, and Taiwanese scooters. These also include engine type 139QMA. You will have a 3 phase type generator and regulator/rectifier. Feel free to contact us to ensure proper fit, because we're sure the price fits at just $29.95
Gave my Tomos nitro 50cc 13mph extra, very happy AAAA++++

High energy ignition coil boosts that weak spark into a real shocker. This will improve starting, acceleration, and fuel mileage. This is plug and play for GY6 scooter atv 50, 125, 150 engines in 152QMI, 152QMJ, 157QMI, 157QMJ, 139QMB, 172MM, CF250, and all other 4strokes. As on all performance parts, no guarantee, as these parts will not fix a problem you may have elsewhere. Fits all Chinese 4stroke engines as well as your budget. $19.95

Here it is for those of you that must have the best. Racing CDI for GY6 based engines in 139qmb and 157qmj and also the 125cc version also. Works with any AC ignition systems with this type plug on it. This is similar to our orange performance CDI, but a more agressive ignition advance curve. Recommended for the serious build. $24.95

This GY6 performance ignition coil is similar to our orange coil, but hotter! These fit all the fourstroke scooter/atv engines like the 139qmb, 152qmi, 157qmj, 172mm, 50cc, 125cc, 150cc, 250cc. Simple one bolt installation. Tank, Jonway, Honda Helix, NST, JMstar, etc. $24.95

Longer life, more stable spark energy are just some of the benefits of our Iridium spark plugs. Get them here cheaper than anywhere else as always. $9.95

High flow performance air filter, clamps right onto your carburetor. Small profile to ensure tight clearance fits. Some 150's have a suspension cross member that interferes with filter installation. Not this one. Fits Tank, Sunl, Roketa, TNG, TGB, JMstar, Jonway. Just about any scooter, atv, buggy, dirt bike, etc. Two sizes for the common carbs. 38mm for the 50cc carb. 42mm for the 150cc carb. $9.95

filter size option

38mm 50cc $9.95 42mm 150cc $9.95

Get it replaced or get it tuned right with that new air filter or exhaust system. These are cheap and easy to replace. Comes in 3 sizes: standard, #115, #125, and the guzzler #135. Only $4.95

choose your size

standard $4.95 #115 $4.95 #125 $4.95 #135 $4.95

Want to preserve your new performance air filter and engine? This slip on pre-filter fits over our sock filters and prevents the larger particles and other debris from ever getting to your main filter, allowing it to last longer and filter more efficiently. Super cheap! $2.95 (may come in black or orange) 

Have, or are you removing your airbox?Is your scoot blowing oil? Have you run dry and don't know why? The reason may be that excessive pressure is being built up in your crankcase, which blows seals and/or pumps all your oil out the vent. This nifty device actually creates a vacuum within your engine by only allowing air out, and not back in. Made in the USA all steel construcion easily attaches to your vent line, which should be place above your engine as far as possible, and installed on the barbed nipple end. Threaded end is left open, or attached to a filter if you wish. This is a must if your running your scoot full throttle alot. New improved model. Cheapest performance fix anywhere at only $9.95

Crankcase vent and oil catch can solves all your venting problems. Oftentimes, scooters and ATV's are run full throttle for extended periods under heavy load. This causes alot of pressure to be built up in the crankcase, which results in a heavy oil vapor escaping out the vent, or anywhere else it can find, like through your seals. This can blow enough oil out that you could run out of oil before you think to check the level. Adds another vent outlet by replacing your oil dipstick. Attaches to your existing line also. We highly recommend adding the PCV to the outlet of this unit also. One line attaches to the existing vent, the other to the new dipstick, the other to atmosphere via PCV valve. Easy installation with all hardware included. Works with any engine. Color may vary. $29.95

Get that acceleration that you want from this performance torque spring at only $14.95. These come in all spring rates and may be colored black or uncolored.

choose your spring rate

1k blue $14.95 1.5k yellow $14.95 2k red $14.95

Performance clutch springs that bring out the wheely machine in your 150cc scooter and ATV. $9.95 Color may be in black or uncolored.

choose your spring rate

1k blue $9.95 1.5k yellow $9.95 2k red $9.95

Now that you've got the power, you better make sure your getting it to the ground. High friction clutch pads with rigid backing plates and red springs make this the definative GY6 clutch on the market. $44.95

Performance clutch bell is better than original for several reasons: Heavy duty constrution with reinforced outer bell reduce or eliminate warping, which caused jittery takeoff. Fuller perforated and ventilated for cooler running. Improved grab, making power delivery assured.  How long will these last at only $39.95

Looking for a more aggressive torque sheave cam angle for your GY6? This is the ticket right here. $44.95 

Super good quality carburetor with the performance flat slide throttle, pumper, reliable electric choke, large float bowl, Keihin components. This carb is a must for anyone wanting to get more speed and acceleration out to their moto. The flat slide reduces veturi eddying, which results in not only better air flow, but more consistent fuel/air mixture ration. Ever seem like your bike ran weird on some days, and not others? It wasn't you, it was your cheap round slide carb. Step up to the plate and stop fooling around. Go fast, and going fast at only $99.95

59mm big bore head is a perfect match to our 59mm big bore head. Good price at only $74.95 

Performance race  CVK quality 30mm carburetor for the 152QMI and 157QMJ gy6 125 and 150cc  four stroke chinese scooter/atv engines. Fits, but is not limited to the Roketa, Sym, Tank, VIP, Tank, Sunl, Vento, etc.
CVK is the ultimate name in carburetion. This kit, with a steel, not rubber, intake manifold will make a market difference in not only overall performance, but in starting and feel. Flat slide reduces turbulence, impoving reliable fuel mixture settings. The this is a whopping 8mm larger than stock, yet you will lose minimal bottom end, but gain tremendous top end speed and acceleration. I would recommend our performance head to take full advantage of this kit.
There is a vacuum port nipple on this manifold, just not in this picture. I would recommend using this carb with our performance Ruima head to take full advantage of it's benefits. We are including everything, even a new performance air filter, for just $124.95
 

This is the A9 spec sport performance camshaft for the 157QMJ and 152QMI 150/125cc GY6 engine. Give your engine a boost in the upper mid-range and top-end. Only $49.95

Super good quality performance cam for a boost in low-end to midrange torque for your 125/150 and larger GY6-150, 152QMI, 157QMJ, 161QMK, etc. New low price. $49.95

Tired of your intake boot cracking and leaking? Want to get the most performance out of your stock or performance carb? These are the ticket. Smooth inlet porting allows for laminar flow that promotes power, and solid aluminum contruction keep that rubber from getting old and cracking. There is a vacuum port nipple on this manifold, just not in this picture.This manifold not only fits 24 - 32mm carbs, but it also fits your budget $24.95

Have you done it all to your performance scooter or ATV? Bet you haven't done this. The 4 valve head is a quality made unit that replaces everything from the head gasket up. Head, cams, cam cover, valves, cam chain, studs, etc.  Make the real performance difference that nothing else can deliver. When it comes to 4strokes, the head is critical. New kits at an unbelieveable and unheard of low price! Not for the faint of heart. $199.95 !!!

Finally, a full replacement gasket kit for our 59mm big bore kit. Includes head gasket and base gasket. Good Taiwanese quality at ScrappyDog price $14.95

Long lasting nitrated Taiwanese ring set for excellent performance. $19.95

Big bore, high quality complete 161QMK long case engine, ready to bolt into your existing 125/150 engine slot. Works with all 150 parts including carbs, exhaust, etc. Comes complete with  remote oil cooler. Don't spend all the expense and labor building a big bore, just get a drop in replacement. These are a pretty unique engine found rarely. We've got a limited supply of these, and have priced them at the usual ScrappyDogs low wholesale cost.  Delivery is for the lower 48 states, but other locations delivery available upon request. This is a complete engine assembly unlike other kits. Don't get an unwelcome surprise.  Makes about 10HP and 7.5 ft/lbs of torque in standard form, but can make up to 18hp depending on periphial equipment and tuning. Belt case is no longer chrome, but we have some available if you need them.  Limitied supply of these big boys in stock.$499.95 

61mm big bore kit fits gy6-125 and 150. Will fit many Taiwanese made 150's like Genuine Buddy, and many others, without case modifications. Standard Chinese engines will require the cases to be bored out. Outside diameter of cylinder base is 65mm. Taiwanese quality here, at ScrappyDog prices! $119.95 

This Taiwanese made big bore kit is the biggest available for the GY6 possible. You will need to machine fit your crankcases to fit, unlike our 59mm which is a direct bolt in.   Complete kit with cylinder, piston, gaskets, rings, wrist pin, clips.  $129.95

Quality Taiwanese built stroker crank bumps your displacement up considerably, depending on the bore size you have. With the above 63mm BBK, you will have a true and full 200cc. You simply need to install a couple of extra base gaskets below your cylinder to make space for this beast.  $149.95

Cool fan cover to augment all your custom performance work you've done. Let 'em know your different without blowing the budget. $19.95 

Fully adjustable integrated racing CDI/coil package is basically the entire igntion package in one unit. Plugs in just like original, and works with all GY6 based AC fired systems. Adjustment pot changes the timing advance to suit your application and make tuning a snap. Try and find these anywhere else, especially for a scooter! $79.95 

Is your bike limited in top speed because it's revved out? Reaching maximum RPM's, and not going any faster? You may need a higher ratio gear in your transmission. These are an easy swap with your original gears, located behind the rear clutch pulley. Made in Taiwan MRTT parts are much better than original also. Comes in two gear teeth count. 15T is for long case (or really low gear on short case), 18T is for short case, or really high gear on a long case.  $39.95! 

choose your tooth count

15T $39.95 18T $39.95

Replacement choke electric enrichener circuit for the larger CVK type carbs. Fits genuine Keihin also. Rare find, for a rare price. $24.95

Chromed out long case belt cover for your GY6 125 and 150 scoot and atv engine. Good quality, at an unbelievable price. $59.95 

OOF! Big bore 200cc engine assembly for your ATV/buggy/4wheeler finally! This is a complete engine that will fit in your buggy 125 or 150cc application with little or no modifications. Comes with forward,neutral, and reverse gear shifting transmission short case. Will attach to existing remote shift systems also. Heavy duty design is built to performance and last. Much better than original. Even has a remote oil cooling system. $549.95 

94 link cam chain is a replacement for 4valve performance head kits, BN type engines with 16" rear wheel, and CH125/150 engines. No where else can you find this! 19.95 

Gas charged, remote reservoir racing rear shock. Fully anodized aluminum with heavy duty springs greatly improves road handling and bottoming out. Works and lasts longer than original by light years! Sold as singles for rock bottom price at this quality level. $99.95