Robin suburu 13.5hp upgrades? Help

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mrg90

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Ok so I have a robin suburu 13.5 hp engine I want to get more power out of this I was wondering what I could do to improve is performance plz help anything would help..
And everything on there is stock from what I was told
 
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Linksep

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Replace the muffler with an open header, make a better intake (air box or open air filter), mill 0.020-0.030" off the head, make sure the carb is properly tuned.
 
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solomon

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I wouldn't, those things rev really high, and you will probably blow a rod
 
freakboy

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if your smart and know how to controll the engine and gauge rpm with your ears then you will be fine.
 
freakboy

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yeah you can make your own exhaust if you have a welder some pipe and a steel plate.. just trace out the flange on the muffler then cut that out of the plate and then bend the pipe how ever you want and you get a nice sounding engine...

also dont be afraid to remove the govoner.. the valves should float around 5500 rpm if you have it guned... and it wont blow under load only time it really would be a gaurentee blow up is if you have it free reving on a stand and just gunning it.
 
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solomon

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IDK about the valve float, this is 13.5hp, so it has much stronger springs in it. I dont think you would get valve float in this thing until like 6500 rpm. If you do remove the governor just do as freakboy said and listen for the sound.
 
Kaptain Krunch

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solomon said:
IDK about the valve float, this is 13.5hp, so it has much stronger springs in it. I dont think you would get valve float in this thing until like 6500 rpm. If you do remove the governor just do as freakboy said and listen for the sound.
Click to expand...

The heavier springs are only there because the valves are bigger and heavier. Should still float around 5500.
 
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solomon

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well i know on my 8hp Briggs the valves didn't float and it reved over 6500 rpm. Just be cautious is all. that's my .2 cents
 
NJOHC

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There's really no need to rev any higher than 5500rpm with those anyway unless you just want more top speed. Even that isnt a good idea because any higher than 5500rpm is risking it, especially with the ohv engines since I dont know of anybody who has tested those for racing. By 5500 it will have hit peak hp. Like everyone already said exhaust really opens them up. To make the most of freeing up the exhaust you can put a k&n style filter on it. That would take some fabricating on your part though, because nobody makes an adapter for those. You could try to start out with a gx390 adapter (affordablegokarts.com) and modify it as needed. I dont know how that would work out though. Beyond that there isnt really anything made for the OHV subaru's that I know of.
 
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