New 79cc build

[birdmannn101]

SB, That is what I am using, the "max torque clutch" with a jackshaft instead of the Q matic transmission. So, I have 2 chains to deal with while you have 1 chain and 1 belt. One of the 2 chains always gets some slack in them. Heck, that might be what is causing the clutch chatter and vibrations.

 

[runnermike]

Which chain is it...from the clutch to the input, or your chain to the rear sprocket? It could possibly be alignment if the chain is tight and then goes slack.

 

[culvercityclassic]

It's the clutch that causes the chatter... Spend the money one time and purchase the right clutch. End of debate.... Now back to the orig post....

 

[runnermike]

lol........

 

[headtrama]

The only problems I have areth what I found on the Internet. It says 3/4" bore drive with 3/16" keyway and my HF79cc is 5/8" drive.

Factory Set to engage at 4000 RPM. The HF79cc engine Maximum speed (rpm) is 3600 RPM with a Maximum Torque (ft. - lbs.) 3.5 ft. lbs. @ 2500 RPM, so I'm thinking this might not work in my case.

This racing clutch looks like what I need if it fit the engine.

With the Governor removed that motor should go to 5000 rpm easy

 

[PAracer]

Headtrama, what's the 411 on the upgraded valve springs? Where did you find them? Are they predator 212 or handa parts? I am very interested in getting a set.

Thanks!

 

[headtrama]

These are the springs i have been running and the place i get them from
http://www.doverpoweronlinestore.com/catalog/item/8251221/8954788.htm

 

[headtrama]

I swapped out my 79cc for a 99 cc today , What a difference some cc's make . The bike is actually fun to ride now .

Im going to have to soften the clutch now because it hits a little hard on take off . Only thing done to the motor is I decked the head for more compression and cleaned up the ports and heavy valve springs .

When I was fitting the stainless steel clutch shim I made for the cheetah clutch I slashed my hand open on it and had to get stitches today . So I didn't get much time to ride it . But it rode well on its first ride .

 

[PAracer]

Sorry about the injury. Ive mashed and slashed myself pretty good a few times over the years. Not fun.
Ive read that you can use the 79cc head gasket on a 99cc block. The 79cc gasket is .030" thinner.
Thanks for the note about the springs. Sounds like a set of upgraded clone springs would work for me.

 

[buba]

head --sorry to hear it took its' toll in blood--heal quick

best

 

[silverbear]

These are the springs i have been running and the place i get them from
http://www.doverpoweronlinestore.com/catalog/item/8251221/8954788.htm

Is there a guide somewhere on how to swap out the springs? I was thinking about picking up another 99 Predator. Are they still available anywhere?
SB

 

[headtrama]

The springs are a easy swap, affordable go kart has a build up of a 99cc motor on there website. The 99cc is no longer available.

 

[F_Rod81]

I swapped out my 79cc for a 99 cc today , What a difference some cc's make . The bike is actually fun to ride now .

Those extra 20cc's do make a big difference. I recently swapped the stock springs in my 99cc for the 18lb springs from AGK, wow no floating at all.

 

[F_Rod81]

Is there a guide somewhere on how to swap out the springs? I was thinking about picking up another 99 Predator. Are they still available anywhere?
SB

SB,

Here is a video describing one way to perform it...

clone valve spring swap/ set

 

[gokart25]

Those extra 20cc's do make a big difference. I recently swapped the stock springs in my 99cc for the 18lb springs from AGK, wow no floating at all.

what do you mean floating? what does the motor sound/act like when floating?(chuggs or cuts in and out?)

 

[maniac57]

I've always found my bikes run better after being christened with blood, sweat and tears.
I have also been known to dance naked at midnight on a full moon at the local dirt track....
smeared with 90 weight gear oil and wearing cheap sunglasses.

 

[scotto-]

I've always found my bikes run better after being christened with blood, sweat and tears.
I have also been known to dance naked at midnight on a full moon at the local dirt track....
smeared with 90 weight gear oil and wearing cheap sunglasses.

In the winter?

What do the neighbors think?

 

[headtrama]

I got some more seat time on the bike today . I rode over to culver city classics today and the bike ran really well . The motor will rev past 6000 rpm but I like to keep it about 5000 5500 rpm .I let Jeff ride it and he seemed to like the way it rode . Thanks Jeff for hooking me up with the 99 this bike is way more fun to ride now .

 

[culvercityclassic]

Ya the bike runs great Andy... Made me work on mine after you left.... Ha ha