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Messages - cycloneracer

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31
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: April 06, 2020, 09:35:27 pm »
That site states you need to replace the flywheel as well for safety.  Performance is the added benefit. 

No discussion of removing the governor without a billet flywheel. 

Most “free” modifications do not gain much performance.    Camshaft and valve train will yield the best gains.


32
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: April 06, 2020, 12:42:41 am »
Quote from: CedarHill on April 05, 2020, 07:21:14 pm
I got about 13 hp out of a 6.5 hp 212 cc predator engine with less than 6 bucks. I strait piped it, removed the governor, made a custom air filter, and jetted the carb. The thing shot 6 inch flames out the exhaust then blew up putting a hole in the crankcase. Don’t rev it under no load and I’d say your fine. The engine was a couple years old and ran hard. Also their only $99 at harbor freight. Just remember, more air flow = more power. One thing to watch with the small engines at high rpm is if the pressure release on the cam gets stuck. If this happens it will be really hard to pull on the starting cord and you just have to open up the crankcase and tap it to get it to move.

Dyno sheet?   

No way you double the horsepower by jetting the carb.   Flames out of exhaust is too rich and less horsepower. 

If you remove the governor you need a billet flywheel for safety. 

33
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: March 25, 2020, 09:05:47 pm »
Flywheel and ride are a must if removing governor from an opposed twin.  Leave the rest stock and you will have cheap fun.   

If you only remove the governor you will shoot a rod through the block or die when the flywheel explodes.   

34
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: March 24, 2020, 01:31:06 pm »
A clone of a Honda engine.  Sold by retailers such as harbor freight.  All the Honda parts fit.   There are a lot of performance parts for the Honda.

35
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: March 23, 2020, 01:39:19 pm »
I'm not sure what is available for that engine.

If your removing governor you will need a billet flywheel and billet rod. 

Probably going to need to do something with the valve springs and retainers.

For more performance a better cam and Carb are next.

Although you can probably find a used built clone engine for less money.

36
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: March 19, 2020, 01:15:26 pm »
Is this a horizontal OHV engine?   I’m not familiar with the smaller Briggs engines. 


37
Briggs OHV & Vanguard / Re: Exhaust System for Briggs V Twins
« on: March 18, 2020, 10:11:58 pm »
I haven’t ever heard of anyone building mass produced exhaust for a twin.  They wouldn’t fit right.  The exhaust ports would never line up.   Everyone cuts heads different amounts.   .01 difference is a big difference in making exhaust line up on a v twin.

Buy a bunch of u bends and build your own.   Just be careful of to warp it when you weld it all up. 

38
Coffee Shop / Re: what mods can i do to my B&S 6.5hp engine?
« on: March 18, 2020, 01:06:24 pm »
Let’s start here. 

http://www.heymow.com/index.php/topic,2590.0.html

Quote from: loggers gogert on March 18, 2020, 10:39:37 am
what if i was lying?

Then you won’t be here for long. 

What is your budget?    That will determine how far you can go.  Is it $5 or is it $5000.

Depending on budget you may be better off finding a different engine.

39
Racing Mower Builds / Re: Paul's 2008 FX build.
« on: February 02, 2020, 12:07:45 pm »
I don’t have any pics.   All I did was drill a hole on the topside and welded on a hose barb.   

Super easy. 

40
Briggs OHV & Vanguard / Re: Vanguard 23 build question
« on: January 17, 2020, 11:11:53 am »
That is what was on my 42 cube kohler. 

41
Briggs OHV & Vanguard / Re: Vanguard 23 build question
« on: January 17, 2020, 12:39:03 am »
I’ve never built a vanguard but it sounds like you are on the right path. 

Ditch the stock style carb and run dual mikuni’s. 

42
Briggs OHV & Vanguard / Re: 21 hp racing engine suggestions
« on: December 09, 2019, 06:05:53 pm »
Quote from: Tylertyco on December 09, 2019, 05:05:53 pm

I'm not in a racing class, were just racing for fun on my buddy's dirt bike track for cash lol

This is a horrible idea.    Someone will get hurt.   Find a group to race with they are everywhere.    Especially if your going to sink a couple of grand into an engine. 

Steel stock push rods will work until they bend.

Can run stock rocker arms.

Will need different retainers if your upgrading springs.

The briggs single OHV intake valve is much larger than the one in the twin.   It is the same length and same stem so all you need to do is machine in a new valve seat.

As for a cam, find a builder you like and go from there.

90 degree box can be found on ebay, junk yard.   Can buy a new one from just about any mower shop. 

43
Briggs OHV & Vanguard / Re: 21 hp racing engine suggestions
« on: December 09, 2019, 02:09:44 pm »
If you are going to run this without a governor spend the money on the good parts.

Billet Flywheel is a must if your running ungoverned.   Billet rods will make it last.   Some have used the 49 rods, but in the end they are still cast rods designed to be in a lawnmower running 3500 RPM.


What class are you racing this in?    If in FXT I'd go with twin Mikkuni carbs.   The 2 barrel carbs are better than the single, but not by much.    Even modified the 2 barrel carbs suck and are at a huge disadvantage to "real" carbs.

I had a 44 that I took .125 off of the heads and installed briggs single intake valves.   I'm sure there are better valves out there now, but this was a long time ago and was a easy mod for the machine shop to do.

Your also going to need to upgrade your valve springs and retainers.

I'd recommend a cam as well.

44
Kohler Engines / Re: 42mm Mikuni HSR
« on: November 22, 2019, 05:52:33 pm »
The engine that Zach Kerber built me had 2 42MM mikunis on it.   I think he sells a kit with the intakes and carbs.   Check his website out.


45
Briggs Flathead / Re: Super charged 42CI opposed. Valve springs, head gaskets, ect...
« on: November 16, 2019, 12:44:34 am »
After watching 1/4 of the video......well......I don’t think a supercharger will be much benefit.

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