Go kart 5hp briggs rebuild help

[freakboy]

It depends does the origional one have damage to it?

 

[vandancouver]

if the original is damaged then no. if its ok then yes. when in doubt put a new one in. its really simple. might not even need it at al

 

[solomon]

ok sounds good to me. i figure the key will need replacing as i think it will damage when pulling flywheel of due to age of motor and condition

 

[EagleTalons]

Oh should i replace the rings too?

Check them for tolerances. If they don't meet, get new rings. I've used a key off of a 3.5hp briggs that fit fine, so just look around, they are everywhere!

 

[solomon]

ok sounds good thanx. The only trouble i really ever have with these briggs are the valves =P. 5hp is the easiest to get the springs on and off but its hard with a valve spring compressor. Any special tricks? I use screw drivers and pry

 

[EagleTalons]

Stick the compressor fork between the retainer and the spring. Tighten until you can wiggle the retainer.

I had a little trouble with my exhaust spring because it is slightly larger than the intake spring.

This is the compressor I have

 

[solomon]

how much was it remember im on a budget i will have like $4 left after the clutch. That tool looks like $20 or more =(

 

[Fawteen]

At the price of clone motors, I've never found it economical to rebuild anything under about 8 HP. And that's just adding up the cost of parts, never mind the time it eats up. Also, a new engine comes with a warranty.

Re-ring, hone the cylinder and lap the valves in maybe, but once you start with an overbore and a new piston, I can't make it pencil out.

Has anybody kept records and actually tracked the total cost lately?

 

[solomon]

generic motors are myths. They are not real only Briggs, Honda, and Tecumseh are true engines that exist. Anyhow i love working on my Briggs engines and i love to know that its My labor and not some one else's labor that COULD fail. I tryst my labor over a factory engine any day =P

 

[freakboy]

Tecumsehs dont exist either friggen pos's

 

[Kaptain Krunch]

You forgot Kohler, they are true engines. Those old cast iron block kohlers were some of the best small engines ever in my opinion. I like briggs too, but was never a huge fan of honda mainly because i could never afford one haha. Don't get me started on tecumsehs...lets just say their out of business for a reason.

 

[freakboy]

Those old kohlers were beast along with onans!

 

[solomon]

I hate Tecumseh they might as well be a knock off. They are the number 1 rated carburetor failed motor i work on. Im only 15 so i havnt been around long enough to get a Kohler engine. So on my 5hp briggs im thinking about taking it to the shop for the valve job they actually cut the seats n crap, really nice for like 30 bux. All i have is lapping compound =P

 

[freakboy]

Laping the valves will do the exact same thing and all you need to really do is get the tool ist a stick on a suction cup lol and just put the compound on the valve and just go till it dont make the gritty sound anymore then wipe the compound away and do it again then wipe and your good.

 

[solomon]

i have all the stuff i bought it and did the job for about a solid 30 minutes on each valve nice even ring put it together compression was standard, then i told the guys a t my local small engine shop "Camino power tool" and they laughed and said compound is old and doesn't work well, let them do a valve job and i mean WOW huge Huge difference. Cutting is so much BETTER like 15 psi more compression.

 

[freakboy]

alright well remember compression isnt everything in these but u did get compression a good way. u might wana shave eyebrows if you didnt to increase flow.

 

[brendonv]

i think ur mower shop just wanted ur money. I find lapping to do a great job. U have to actually take the lifters out to lap it correctly or they wont properly seat. Lapping will give u more than enough compression. Maybe u didnt lap it long enough. Try putting pernament pen around the seat then lap. That way u can see if any parts arent lapped so keep on going till all the pen is off and ur good to go.

 

[solomon]

i did that to my 8hp it was obvious help. Should i mill the head i have access to the equipment, the head im installing i used a dremmel and made a "fire Slot". If i shave the eye brows i will definitely do it when its stripped down to the bare block to avoid shavings anyware in the motor. i also use the dremel and sanding drum and and clean up the intake port. I cant straight pipe this kart where i live, neighbors love dialing 911. So should i use a 4 dollar threaded muffler or a square one?

 

[solomon]

i think ur mower shop just wanted ur money. I find lapping to do a great job. U have to actually take the lifters out to lap it correctly or they wont properly seat. Lapping will give u more than enough compression. Maybe u didnt lap it long enough. Try putting pernament pen around the seat then lap. That way u can see if any parts arent lapped so keep on going till all the pen is off and ur good to go.

I did do exactly that, i even gapped the valves and removed lifters when lapping and i always use sharpie. Cutting is the best way to do valves IMO, there is a reason those kits cost 20x more than a lapping kit lol

 

[freakboy]

if you want more performance dont use a screw on one use one that needs a flange and hows that fire slot workin for ya? i was thinkin about doin one today. also today i took my pipes and cut the part that goes into the block even tho they have flanges and cut them off.