Coolster 3150DX2 "jerking" and loose throttle? [Archive]

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02-26-2017, 04:31 PM

Hey guys, still trying to figure out what's causing this new machine to "jerk" when going forward. If I go in reverse, it's smooth. Soon as I put it in forward and push the throttle, it jerks and bounces and I hear loud clacking noises. I thought it was the chain which was super tight so I adjusted it where it has some play and the issue is still there. Also, I'm not sure if this is related but when I press the throttle in (reversing it going forward), the engine revs but I have to press the throttle in far for the atv to actually move. And sometimes I hear a grinding sound and loud clanking sounds when it does start moving which is accompanied by the "jerking" of the machine. Any ideas on this?

ben2go

02-26-2017, 07:50 PM

02-26-2017, 10:44 PM

It sounds like the centrifugal clutch needs adjusting. I don't know how to do that on those machines. Maybe someone here will chime in. There maybe a video on Youtube showing how to do it. I know some of the older Hondas use the centrifugal clutch set ups.

I'm not sure the coolster 3150dx2 has one of those. It's a full automatic. My taotao 125f1 has one and I recently adjusted it. I don't see anything like that on the coolster.

ben2go

02-27-2017, 08:02 AM

I'm not sure the coolster 3150dx2 has one of those. It's a full automatic. My taotao 125f1 has one and I recently adjusted it. I don't see anything like that on the coolster.
:hmm: I wonder what it uses to couple/uncouple the transmission from the engine. :shrug:

zackattack91

02-27-2017, 09:00 AM

It's a CVT drive. Belt driven, but there is a final gear transmission. I don't know hw to adjust it either. It's the same engine as on Chinese scooters and those little Honda ruckus moped looking things. Search forums on them. Engine model 157qmj. Maybe u can find some info.

JerryHawk250

02-27-2017, 09:40 AM

Have you tried checking the clutch to see if it had any thing broken? Maybe a spring loose or broke. But I don't think it has anything to do with the clutch as the clutch is always turning the same direction. If it does it in forward it should do the same in reverse. May be in the transmission it self. Its hard to diagnose with out it being in front of me. Take and post a video will help.

02-28-2017, 07:52 PM

Here are some videos. 1 shows jerking and clanking when it finally decides to move. 2 shows it not moving at all.

https://vimeo.com/206163174

https://vimeo.com/206162990

FLASHLIGHTBOY

03-01-2017, 04:20 PM

zackattack91

03-01-2017, 04:28 PM

You need to adjust the nut on your throttle cable for sure. Way too much play in the thumb throttle before the cable is opening the carb. Need an 8mm wrench and pliers. Or 2 8mm wrenches is better. Loosen the lock nut and twist the adjuster till you have only a little play in the throttle then tighten the lock nut against the adjuster. That will solve that minor issue. Not sure how to adjust the gear shifter box though.
Here are some videos. 1 shows jerking and clanking when it finally decides to move. 2 shows it not moving at all.

https://vimeo.com/206163174

https://vimeo.com/206162990

JerryHawk250

03-01-2017, 04:29 PM

Hello....your gearbox shifter is not adjusted right... you can take off the link to he box from your gear shifter and you will see it can go more.. so it is in gear completey.. simple adjustment.. some one else had this problem acouple of post ago... but remove the link and see the main link will go into gear FULLY then... reinstall link when fully in gear... and then check reverse gear... DO NOT GEAR AND REV LIKE THIS.... HARD ON THE GEARBOX.... this is how people give the Chinese brand a bad name... since the buyer assembles it you are responsible to adjust stuff... the dealer if sold assembled is respossible.. thanks
2x on this. Thanks , Video helped. Sorry didn't get back to you on this yesterday. I live in south Louisiana. Everything was shut down for Mardi Gras. Besides I was too busy DJing on one of the floats. lol . Nice warm day and lots nice sites on the route if you know what I mean.:D

03-01-2017, 08:18 PM

Thanks for the replies fellas. I'm attaching some videos showing more issues which is probably the throttle and also some pics to see if you guys can pin point those thing you all mention such as gear box, links, throttle locknuts. I can't seem to find or locate these thing because I have no idea what you all are talking about.... "yes, this is the first time i'm messing with engines and carbs and stuff, sorry".

P.S. I have no idea why they made this thing the way it is. It's impossible to get to the carburetor on this or even that cable that's coming from the throttle which is behind that black bar which is the frame of the atv. On my TaoTao 125f1, everything is easily accessible so kudos to TaoTao and thumbs down to the Coolster.:tdown:

03-01-2017, 08:24 PM

Oops, forgot the videos.

https://vimeo.com/206328744

https://vimeo.com/206328457

ben2go

03-01-2017, 09:44 PM

Oops, forgot the videos.

https://vimeo.com/206328744

https://vimeo.com/206328457

That sounds like either a serious vacuum leak between the carb and engine or fuel starvation. Try that with the fuel cap off. If it gets better, the cap vent may be blocked. There could also be something blocking the carb float bowl vent, causing the carb to stop flowing fuel. There's also the possibility that some crap got into the carb and plugged the jets.

BlackBike

03-02-2017, 12:04 AM

2x on this. Thanks , Video helped. Sorry didn't get back to you on this yesterday. I live in south Louisiana. Everything was shut down for Mardi Gras. Besides I was too busy DJing on one of the floats. lol . Nice warm day and lots nice sites on the route if you know what I mean.:D

No,what do you mean? Pics?

JerryHawk250

03-02-2017, 09:21 AM

No,what do you mean? Pics?
I would get kicked off the forum if I posted those pictures. lol

JerryHawk250

03-02-2017, 09:27 AM

Oops, forgot the videos.

https://vimeo.com/206328744

https://vimeo.com/206328457

It could be a couple of things. Vacuum leak, Stuck carburetor slide (I had this happen and did the same thing), or trash in the jet. The carburetor is a pain to get to. Does it run better after it warms up? If it does then you may be having issues with the enrichment circuit (auto choke)

Azhule

03-02-2017, 09:42 AM

I would get kicked off the forum if I posted those pictures. lol

That's what the "Private Message" feature is for :clap:

Soooo....

"Pics or it never happened" :p

Sorry I'm of no help on fixing your ride... I'm just stopping by to be a goof while my stomach hurts and feels funny (having my gallbladder/food intolerance problems >:)

Swampy

03-02-2017, 10:46 AM

Sorry to hear your having all these issues Ak. Is the carburetor a recent development and does it get better after it's warmed up?

As far as getting it in gear, the linkage you will need to adjust I have circled in green. This linkage pushes/pulls the arm circled in blue up or down to get it into gear. I "think" you will need to adjust so it is longer to have it engage fully into forward. You don't want adjust it too far as then you wont be able to get it into reverse. It's a relatively simple adjustment.

Pardon the picture quality as I am technically challenged.

07PSDCREW

03-12-2017, 11:55 AM

The linkage is probably perfectly adjusted. The problem is the two 8mm screws that hold the arm/lever to the trans, and the two bolts and locknuts that hold the linkage on. This exact problem happened to me, working fine one day, then slamming gears. Use red loctite on the two screws AND the two bolts and nuts holding the linkage and actuator arm on. The shifter should have a "notch" feel as it goes into fwd and rev.... not just drop right into gear.

As far as the running issue, I had the same problem when ambient temp was low. These units are super lean so as to be sold in California. I drilled the little brass cap for the enrichment valve and adjusted accordingly. It dosent do that anymore.