1980s briggs fun power

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  #1  
Old 05-23-11, 09:26 AM
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1980s briggs fun power

I was told by a guy in my neighborhood that this was a very good engine, is this true? whats a good cheap way to beef it up.
 
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  #2  
Old 05-23-11, 09:38 AM
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What do you mean by "very good engine"? It's a basic meat & potatoes engine that's easy to work on and modify.

How do you want to "beef it up"? What will you be using the engine for?
 
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Old 05-23-11, 09:47 AM
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Its on a go kart just looking for some more speed, i dont know if taking off the the gov. is a good idea or not. its been siting for atleast 10 years and all i did was clean the carb and it fired right up.
 
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Old 05-23-11, 10:50 AM
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Almost anything you do for more speed/power will be at the expense of engine life and durability. It's all a trade off. Below are several options to increase power and all depend on the amount of money you want to spend and how much you want durability to suffer.

Before souping-up your cart take a look at it and see where things will go when they break. You don't want any part of your body in line with spinning or moving parts. A couple bad ones are the chain and centrifugal clutch. If the chain breaks it can come whipping around and slap you quite hard. Less likely at the power you'll be getting is the clutch which can sometimes go flying apart (grenade). In both cases proper guarding can save you a lot of pain.

One option is to change the gearing by replacing the sprocket on the axle, clutch or both. A smaller sprocket on the axle will give you more top end speed but hurt acceleration. A larger sprocket will do the opposite. This really will not affect the durability or life of the engine.

Removing the governor is the cheapest (free) way to get more power by letting the engine turn faster. The connecting rod is usually the first thing to let go. Anything above stock RPM is a gamble but around 6'000 to 7'000 rpm's is the upper limit before the chance of breaking the rod becomes extreme. The worst thing you can do is rev the engine with no load. The rpm's can increase very rapidly into the danger zone. It's much harder to get to those high rpm's when there is a load on the engine (driving the cart) so don't play around just revving the engine to hear the sound.

Another cheap way to add a small bit of power is to shorten the oil splasher and run a lower oil volume and use lower viscosity oil. This will cut drag inside the engine since you are wasting less energy splashing oil around. A certain amount can be done without much harm if you are vigilant about watching the oil level and changing the oil often but if you go too far you could be looking at an overhaul or destroyed engine. This is probably not worth the risk for a fun cart.

Another trick is to bore out the carburetor throat and install larger jets. This would require some basic machining skills & tools. If you look online you can buy carburetors that have already been modified so all you have to do is bolt them on the engine. If opening up the carburetor you should also look at replacing the muffler with a tuned header to get the best results. This is basically a long pipe that bolts on in place of the muffler. It's design can help tune the engine to make more torque or to help with high rpm's.

And finally if you have access to methanol it's a cheap & easy way to get a good deal more power out of the engine. Basically you just have to replace the jets in the carb. and run a different oil. You can shove a lot more methanol into the engine and still get it to ignite (gasoline would flood the engine) so you can make more power. You should run a castor oil or synthetic the works with alcohol. The downside is that your fuel consumption will greatly increase and methanol absorbs moisture from the air so you have to be careful to keep your fuel can tightly closed, and unless you live in a racing town getting fuel may be difficult. It also tough on aluminum so it's a good idea to drain the alcohol and oil when you are done running and do a quick pickle job before putting the engine into storage.
 
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Old 05-23-11, 11:14 AM
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thanks alot i will be on the hunt for a new carb and str8 pipem, dont think im gonna mess with the gov. everything ive read on that points to a blown engine. the cart already has a good guard over the clutch and chain so i think ill be ok. thanks again,ill keep you posted.
 
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Old 05-23-11, 11:18 AM
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any good websites that come to mind so i can order parts. im new to go karting dont know much about it
 
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Old 05-23-11, 12:33 PM
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You can get some parts from kart racing suppliers. Just do a search for "kart racing parts" or something similar and many places will pop up. Make sure to spell kart with a k as that is what the racing ones are called versus cart for the backyard toys. Comet Kart Sales is probably the biggest online retailer of kart parts. Your problem will be picking the correct parts among the hundreds of choices but make sure you look at parts for flat head, or Raptor engines. Raptor is the brand name for the racing Briggs & Stratton engine that is similar to yours.
 
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Old 05-23-11, 12:41 PM
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I forgot to mention. Modifying an engine to get more power is not cheap. It may be less expensive to simply buy a new, larger more powerful engine. There are a lot of Chinese clone engines available these days and they are quite inexpensive. A stock, yellow 6.5hp clone engine is about $130. Just a replacement Briggs carb. for your Fun Power engine is probably over a hundred dollars.
 
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