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Forum: Engines & Clutches Yesterday, 10:58 AM
Replies: 28
Views: 413
Posted By KartFab
5252 RPM. Is the magic number. Just look at the...

5252 RPM. Is the magic number. Just look at the basic formula to see 1 divided by 1 cancels out. 5252/5252=1, so at this exact RPM hp=tq.

This is the formula:
H = T x rpm/5252

This whole whp...
Forum: Go Kart Discussion 02-22-2020, 01:12 PM
Replies: 13
Views: 166
Posted By KartFab
You can get a slide carb like a pz20 for $13 on...

You can get a slide carb like a pz20 for $13 on eBay
Forum: Engines & Clutches 02-21-2020, 07:19 PM
Replies: 2
Views: 133
Posted By KartFab
40 series torque converter

40 series torque converter
Forum: Mini Bikes, Trikes, and Choppers 02-21-2020, 02:45 PM
Replies: 4
Views: 75
Posted By KartFab
They will bend before they break if you jump the...

They will bend before they break if you jump the bike a lot. They seem to be positioned too far forward to stand on anyway, donít they?
Forum: Engines & Clutches 02-21-2020, 11:01 AM
Replies: 19
Views: 242
Posted By KartFab
Camshaft for the most part determines your peak...

Camshaft for the most part determines your peak RPM. You can’t turn a certain RPM unless you have a camshaft that has a peak rpm at the range you want.

Unfortunately the highest RPM cams are the...
Forum: Go Kart Discussion 02-19-2020, 10:05 AM
Replies: 13
Views: 166
Posted By KartFab
I found that I could run a 1/4” fuel line though...

I found that I could run a 1/4” fuel line though the grommet and vent it to the ground. Zip ties the fuel line to the grommet. This is the clear/translucent colored type. Looks like you need a new...
Forum: Go Kart Discussion 02-18-2020, 08:40 PM
Replies: 13
Views: 166
Posted By KartFab
My advice is ditch the carb and tank completely,...

My advice is ditch the carb and tank completely, then remove the governor.

You can buy an adapter (or make one if you can weld) that allows you to run a slide carb like a pz22 on the Flathead.
Forum: Go Kart Discussion 02-18-2020, 04:34 PM
Replies: 13
Views: 164
Posted By KartFab
I have been doing some filming hemi vs non hemi...

I have been doing some filming hemi vs non hemi and can tell you this

They both make about the same HP.
Hemi has quality control problems(core shift on intake side noted).
Forum: Go Kart Discussion 02-18-2020, 04:27 PM
Replies: 19
Views: 284
Posted By KartFab
The go kart police are gunna confiscate your...

The go kart police are gunna confiscate your China engine and write you a ticket for non-American made modifications.
Forum: Go Kart Discussion 02-18-2020, 04:25 PM
Replies: 5
Views: 97
Posted By KartFab
Send it and hope you don’t bend it.

Send it and hope you don’t bend it.
Forum: Engines & Clutches 02-18-2020, 04:24 PM
Replies: 21
Views: 283
Posted By KartFab
That’ll buff out.

That’ll buff out.
Forum: Engines & Clutches 02-18-2020, 03:08 PM
Replies: 17
Views: 284
Posted By KartFab
You still haven’t replaced the spark plug so...

You still haven’t replaced the spark plug so don’t rule that out yet.

Did you set valve lash at TDC on the exhaust or compression stroke? If you don’t know the difference, that could be a problem.
Forum: Go Kart Discussion 02-18-2020, 03:00 PM
Replies: 16
Views: 217
Posted By KartFab
500 hours for a predator 1500 hours for a Honda...

500 hours for a predator
1500 hours for a Honda

Most failures I have seen in a 1 hour endurance race include the following:

1) not putting loctite on ALL bolts
2) using #35 chain and losing...
Forum: Go Kart Discussion 02-18-2020, 02:51 PM
Replies: 1
Views: 91
Posted By KartFab
From what I am aware of, the Honda GX340’s,...

From what I am aware of, the Honda GX340’s, 390’s, Predator 420’s, and 10 bolt sidecover Vegas cart 460s all have the same bearing size.

The crank differences are in stroke only. EG 64mm, 69mm,...
Forum: Go Kart Discussion 02-18-2020, 02:45 PM
Replies: 13
Views: 164
Posted By KartFab
I 2nd the $13 ebay carb advice. I will add that I...

I 2nd the $13 ebay carb advice. I will add that I drilled the main jet out to .033” to get the right mixture.

I would also like to add:

1) Governor arm may have worn out the aluminum block...
Forum: Engines & Clutches 02-17-2020, 02:36 PM
Replies: 17
Views: 284
Posted By KartFab
If I was having this issue I would 1) replace...

If I was having this issue I would
1) replace spark plug
2) remove carb and pull start at wot with starter fluid

Do this and check back
Forum: Go Kart Discussion 02-16-2020, 07:08 AM
Replies: 11
Views: 182
Posted By KartFab
I’d try the old axle first. What issues are you...

I’d try the old axle first. What issues are you having? Some sprockets on Manco karts have an Allen head bolt that you need to back out, position sprocket, then tighten down,
Forum: Engines & Clutches 02-15-2020, 03:40 PM
Replies: 20
Views: 401
Posted By KartFab
Looks good. I got some advice from a legit engine...

Looks good. I got some advice from a legit engine builder. Take the long side radius out about 50 thousandths up to the bowl.

Also the short side “corners” can have a bit more material taken out...
Forum: Photo Gallery & Project Log 02-11-2020, 07:44 PM
Replies: 31
Views: 651
Posted By KartFab
I’ve done 64mm stroke and 70mm stroke and it...

I’ve done 64mm stroke and 70mm stroke and it doesn’t affect the engines ability to rev higher. Bigger stroke just makes more torque, especially down low. Seems like the cam and springs determine max...
Forum: Engines & Clutches 02-07-2020, 10:51 AM
Replies: 6
Views: 112
Posted By KartFab
Never had this issue, but then again, I torque to...

Never had this issue, but then again, I torque to spec with a torque wrench.

If i were you, i would clean up the threads with brake cleaner or something to get rid of the oil, the put on more...
Forum: Engines & Clutches 02-06-2020, 07:30 PM
Replies: 18
Views: 333
Posted By KartFab
On my dyno: 6.5 hp stock 7.5 - 8 hp stage 1 ...

On my dyno:
6.5 hp stock
7.5 - 8 hp stage 1
13.2+ hp camAnd slide carb no port work.

Huge gains with cam and carb with no port work. Iirc it was a mod 2 w/22mm China mikuni

With compression...
Forum: Engines & Clutches 02-03-2020, 06:26 PM
Replies: 4
Views: 118
Posted By KartFab
Stage 1 mods will give you a nice boost in...

Stage 1 mods will give you a nice boost in performance from 6.5 hp to 7.5-8 hp with a predator or tillotson 212.

The engine is basically a hemi-predator 212 with stiffer valve springs, slight...
Forum: Go Kart Discussion 02-03-2020, 06:21 PM
Replies: 2
Views: 130
Posted By KartFab
valve float, jetting, timing, and gearing all...

valve float, jetting, timing, and gearing all come to mind. Test each one to see.
Forum: Using Tools and Welding 01-30-2020, 09:50 AM
Replies: 15
Views: 462
Posted By KartFab
get one of these maybe...

get one of these maybe https://www.facebook.com/marketplace/item/2787612981306386/
Forum: Engines & Clutches 01-26-2020, 09:47 AM
Replies: 21
Views: 517
Posted By KartFab
16 stock carb flows 41-42 Slide carbs: 22...

16 stock carb flows 41-42

Slide carbs:
22 flows 88 CFM,
24 flows 97
26 flows 110

So prbably less than 88, but more than 42 hehe
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