Engine RPM Help

[tramont]

I wanted to buy this engine http://www.ebay.com/itm/DuroMax-16-...ltDomain_0&hash=item2ebc9a25be#ht_4993wt_1396 but is there anyway I can remove the governor and run it full throttle without worrying about it blowing up? Also what size centrifugal clutch do I need to put on there I cant find the size such as shaft=3/4 diameter and so on.

 

[rcarteraz07]

I'm looking into the same engine. I'm not about the governor but here's the shaft dimensions on the listing.


Shaft Size: 1" Diameter, 2-3/4" Long, 1/4" Keyway,
Shaft End is Drilled and Tapped with a 3/8" 24 UNF.

 

[r_chez_08]

Remove the governor and do not worry. You can buy a billet rod and flywheel from www.arcracing.com if you want to be 99.9% safe. However, this is the rule I work by with hondas and clones- if you do not upgrade the valve springs, valve float will stop the motor blowing up. 5000rpm or so.

 

[Jcotz]

I cannot say that if you remove the governor, you will be 100% safe. If you exercise common sense and do not over rev it with no load for extended periods of time, then you should be fine. If you want to be 100% safe, then go with a new flywheel and rod.

 

[tramont]

I'm looking into the same engine. I'm not about the governor but here's the shaft dimensions on the listing.


Shaft Size: 1" Diameter, 2-3/4" Long, 1/4" Keyway,
Shaft End is Drilled and Tapped with a 3/8" 24 UNF.

I see that but I need help knowing what centrifugal clutch to invest in.

 

[tramont]

Remove the governor and do not worry. You can buy a billet rod and flywheel from www.arcracing.com if you want to be 99.9% safe. However, this is the rule I work by with hondas and clones- if you do not upgrade the valve springs, valve float will stop the motor blowing up. 5000rpm or so.

how can i figure out what is the top rpm

 

[sexyvicta]

when the valves bounce. lol

 

[Jcotz]

Here is a 1 inch centrifugal clutch...http://www.northerntool.com/shop/to...-Kart + Minibike Parts + Accessories-_-233515

If you don't remove the governor, then your top rpm will be 3600. If you do remove the governor then your top rpm will be around 5000 rpm. If you want to know exactly, then get a tachometer.

 

[r_chez_08]

http://item.mobileweb.ebay.com/viewitem?itemId=140669939343&index=9&nav=SEARCH&nid=59210994749

Cheapest tach that I can find. It is the only way to tell accurately. Box stock gx200 clones can rev 5800rpm.
I would recommend you get a better air filter and exhaust. This will help to sustain your power band up into the higher rpm.

 

[anderkart]

I see that but I need help knowing what centrifugal clutch to invest in.

There's several clutch choices for a 1" bore 16hp engine, one of the biggest factors to consider is how many teeth the clutches drive gear has. They're available in anywhere between 10 and 18 tooth models, and for using #35, #40/41 or #428 pitch chain.

I own several similar engines using 1" bore clutches, I could help but you need to post more info first, like:

How tall are your back tires?
How many teeth does your axle sprocket have?
Where will you be riding? (off-road/hill climbing, or only on flat hard ground?)
How heavy are you and your kart? (post a pic of your kart if possible)

And finally what pitch does your chain/rear sprocket have? Here's a guide to measure yours:

 

[tramont]

I wanted to ask is a jackshaft needed i wanted to just get a torque converter then run it to the axle

 

[tramont]

I plan on buying a torque converter

 

[r_chez_08]

Yes, a jackshaft is required. Otherwise you will be geared for like 200mph, but you will just sit there burning belts.

 

[tramont]

Thx for replying now that i know i need a jackshaft can you tell me how i would set it on my kart im going to upload pictures in a minute. also i wanted a 4:1 ratio is that okay since im going to have a torque converter.

 

[r_chez_08]

How tall are your back tires? It may be ok, depending on your kart.

 

[tramont]

they are 18in

 

[tramont]

also how would i mount that piece the jackshaft goes in to the piece its above

 

[South Kart3377]

Thx for replying now that i know i need a jackshaft can you tell me how i would set it on my kart im going to upload pictures in a minute. also i wanted a 4:1 ratio is that okay since im going to have a torque converter.

4:1 are you crazy? No way even with a tc, if you want any bottom end or Non flat ground riding. Get a 5:1 AT LEAST, I THINK YOU NEED A 6:1 RATIO. With a 4:1 ratio you will be burning 40.00 belts in minutes. I know a 40 series is tough but thats asking way to much of it. (A 40 series is what you need for a tc)

 

[r_chez_08]

4:1 are you crazy? No way even with a tc, if you want any bottom end or Non flat ground riding. Get a 5:1 AT LEAST, I THINK YOU NEED A 6:1 RATIO. With a 4:1 ratio you will be burning 40.00 belts in minutes. I know a 40 series is tough but thats asking way to much of it. (A 40 series is what you need for a tc)

Woah hang on there...
I run a 6:1 ratio with a 6.5hp clone and 19" wheels. Not an ideal ratio, but I managed donuts. Am I crazy? Actually that is highly debatable BTW I am still on belt no.1, no wear visible yet. These 40 series tc's can take abuse...

He has a 16hp powerhouse-I would suggest you still gear 5:1 to 6:1 like southkart suggested, afterall you are removing the governor, you want to allow your engine to rev up to make use of those higher rpm. with a 4:1 ratio you could theoretically get almost 70mph. With a 6:1 you are looking at 45mph @5k- Plenty in a kart IMO.

As for setting up the jackshaft- install the 40 series driven on there, and slide into the bearings using lock collars either side of the torqe converter and bearings.

 

[tramont]

4:1 are you crazy? No way even with a tc, if you want any bottom end or Non flat ground riding. Get a 5:1 AT LEAST, I THINK YOU NEED A 6:1 RATIO. With a 4:1 ratio you will be burning 40.00 belts in minutes. I know a 40 series is tough but thats asking way to much of it. (A 40 series is what you need for a tc)

okay thanks can you explain to me how i would mount the engine on the back i have pictures. also will i need 2 sprockets on my jackshaft?