Go Back   DIY Go Kart Forum > Building Plans And Advice > Engines & Clutches


Thread Tools Display Modes
Old 02-23-2020, 01:05 PM
VASwinger VASwinger is offline
Junior Member
Join Date: Jan 2020
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default Questions about Clutch/TC Operation

Howdy everyone! I have some questions about clutches and TCs.

I currently have a 30 series drive clutch on a 212 Predator. I purchased an inductive tachometer to get a better idea on exactly what rpms things were happening-

It is not on a go kart- itís actually a kids ATV with same clutching as go karts (ETON Viper 90)

Idle rpm between 1600-1800. Idles a bit higher when cold

Clutch engagement/lockup between 2800-3000 rpm

Wide open throttle - 3600-3750 rpm

Engine is stock.

My problem is the 3000 rpm engagement speed. How do I lower this?

Will a 40 series TC solve my issues.
Reply With Quote
Old 02-23-2020, 10:46 PM
Brianator Brianator is offline
Join Date: Feb 2020
Location: Barrie, Ontario, Canada
Posts: 97
Thanks: 10
Thanked 21 Times in 20 Posts

Heres the chart for the garter springs and weights to fine tune your engagement rpms. 2300ish rpm is stock for the 30 series and that's achieved with "blue" springs and zinc weights. Garter springs are pretty cheap and easy to order online (and install) so I'd recommend getting a couple different ones that will lower the engagement rpm and experiment.
Attached Thumbnails
"Put off until tomorrow what you can do today!"
Reply With Quote
Old 02-23-2020, 11:15 PM
itsid's Avatar
itsid itsid is offline
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 11,045
Thanks: 1,482
Thanked 4,589 Times in 3,464 Posts

blue and zinc is the stock configuration of a series30
(and also all chinese copies)

While chinese copies can vary a bit more than proper Comet parts
full lock past 2800 is indeed odd.

But usually chinese TCs aren't that bad tbh..
so the springs should be close enough to comet's specs
maybe it's indeed just tiny misalignments and issues that add up
and we can solve that without buying anything..
for that pictures will be needed.

Are you sure the clutch is properly mounted and so is the belt?
could you provide a few pics please?
does it feel sticky perhaps?
if so you maybe forgot to lube the driver weights
(dry lube ONLY!!)

late engagement can also be a cause of bad gearing btw...
so maybe tell us about your chain ratio as well.

if that fails I'd buy and try both,
original comet blue and pink carter springs (beltpalace has them all AFAIK)
but the stupidly high idle of a predator can cause an issue with the pink ones already.
but it's still cheaper than buying a better quality engine (the Honda gx200 idles at 1200 rpms)

Jokes about german sausage are the wurst.
Reply With Quote
Old 02-25-2020, 11:32 AM
VASwinger VASwinger is offline
Junior Member
Join Date: Jan 2020
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts


I’ll update with some pics.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 06:47 AM.