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Hey guys,

Went riding again this weekend and noticed a strange issue. In fourth (highest gear) if I am not accelerating I get a miss. It will engage and jerk a bit until I get on it a little. Any ideas?

I used the search for an answer in another thread, but I didn't find anything that I thought was the answer.
 

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Slipping clutch??

Maybe you're caught between 4th and 5th because the 300EX is a 5-speed like the good Dr. above mentioned.

What kind of oil are you using in it?
 

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ahhh that makes sense haha.

By your description, it sounds like you're describing a semi-auto bike.

Like you shift to 5th, and it lurches forward.

But if it's a 5 speed manny, I am not sure what you mean by this:

"if I am not accelerating I get a miss. It will engage and jerk a bit until I get on it a little."

Does it do this while you're holding the clutch, or while your are releasing it for full engagement?
 
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Discussion Starter · #6 ·
Yep. Semi-auto I guess. Clutch is a brake clutch, so only needed in reverse.

I guess the best description is that when I am in fifth and am only giving 5-10% throttle I am losing power and it will surge back after a second. Once I get to 25-30% throttle or completely coast I don't get the loss of power with the accompanying surge.

I hope that is a more accurate description to give you guys that are willing to share some knowledge a better idea of what the bike is doing. I spoke to a friend that used to ride a similar 300 and he told me that he used to get the same thing, which only confounded me more.

Any ideas are appreciated.
 

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Sounds like you have a slipping clutch. That's my best guess. I'll grab some popcorn and see what other people think.
Edit: Does it happen when you first shift out of 4th and into 5th? Or does it happen after you accelerate in 5th for a good distance.
 
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Discussion Starter · #8 · (Edited)
It starts after a fair distance if I hold at 5-10% throttle. Maybe 30 yards ~ish. Then if I continue to hold it will do it every 20 seconds. Only lasts for about 2 seconds from dropping power to re-engaging. There is no sputter. It almost feels like I can't hold that speed because it is the top end of fourth and the bottom end of fifth gear.

I don't know if its a problem or minor annoyance, but I don't want to do damage that I have to repair later if it's something that I can fix.
 

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Aha! Okay makes way more sense now that I know it's a semi-auto.

You should change the title of the thread from "Manual" to "Semi-Auto" just to bring some more specific eyeballs to the thread.

I recently discovered a clutch adjustment screw on my girl's 250EX at the front of the motor.

Does the 300 have something similar?

Could just need to be adjusted.

If it's specifically a "TRX300EX", then it should be a fully manual trans.

Is it a fourtrax 300??
 
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I may be wrong on this. But didnt the newer 300ex's have a trainer clutch similar to a rekluse? They are semi auto but there is a clutch if you want to use it you can if not its just like a 250ex. Again may be way off here but for some odd reason i remember reading that somewhere? When searching options for my wife to learn how to use a clutch and not ruin my quad lol
 

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I think the 300ex/300x (and original 87-92 250x) was always full manual. The auto clutch was exclusive to the 250ex. You could use the clutch to shift but you didn't have to as long as you let off the gas.

Rob
 
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Discussion Starter · #13 ·
Maybe because it's a 300EXT? I don't know if that make a difference in the transmission/clutch function. I just let go of the throttle and shift.

I read the part of the service manual about adjusting the clutch when I was just familiarizing myself with the bike. I don't really understand why a clutch adjustment would be needed. (Sorry, I'm one of the guys that have to understand something before I can rest) If this only happens in 5th gear and the rest of the gears operate just fine, how does this work?

Also, I have no idea how to change a thread title. Search function led me to lots of good threads about how to transfer/replace a title for the bike though.
 

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Can you post a pic of the quad so we can properly identify it?

Rob
 
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Well the motor is doing the hardest work in the highest gear as it is transferring the engine RPM's to the drive line at it's highest pace.

The clutch adjustment allows for more or less slippage basically.

The clutch engages at a certain RPM, and the adjustment raises and lowers the engagement RPM.

If it's too tight, it will want to lurch forward, if it's too loose, it will slip easier.

My first thought is that the clutch adjustment needs to be tightened up a bit.

You need to remove the lock nut, then adjust the screw all the way out until you feel resistance.

Then turn it back in a half turn, and reinstall the lock nut.

If it still slips, remove the lock nut, and turn it in another half turn.

Repeat until it you find the sweet spot (no lurching, but all gears engage).
 

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Discussion Starter · #18 ·
Well the motor is doing the hardest work in the highest gear as it is transferring the engine RPM's to the drive line at it's highest pace.

The clutch adjustment allows for more or less slippage basically.

The clutch engages at a certain RPM, and the adjustment raises and lowers the engagement RPM.

If it's too tight, it will want to lurch forward, if it's too loose, it will slip easier.

My first thought is that the clutch adjustment needs to be tightened up a bit.

You need to remove the lock nut, then adjust the screw all the way out until you feel resistance.

Then turn it back in a half turn, and reinstall the lock nut.

If it still slips, remove the lock nut, and turn it in another half turn.

Repeat until it you find the sweet spot (no lurching, but all gears engage).
Makes sense to me now. I'll get on it sometime this week and let you folks know how it turns out. Thank you!
 

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Maybe because it's a 300EXT? I don't know if that make a difference in the transmission/clutch function. I just let go of the throttle and shift.

I read the part of the service manual about adjusting the clutch when I was just familiarizing myself with the bike. I don't really understand why a clutch adjustment would be needed. (Sorry, I'm one of the guys that have to understand something before I can rest) If this only happens in 5th gear and the rest of the gears operate just fine, how does this work?

Also, I have no idea how to change a thread title. Search function led me to lots of good threads about how to transfer/replace a title for the bike though.

Any moderator can change the title of your thread for you. I got it covered!
 

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Discussion Starter · #20 ·
Maybe because it's a 300EXT? I don't know if that make a difference in the transmission/clutch function. I just let go of the throttle and shift.

I read the part of the service manual about adjusting the clutch when I was just familiarizing myself with the bike. I don't really understand why a clutch adjustment would be needed. (Sorry, I'm one of the guys that have to understand something before I can rest) If this only happens in 5th gear and the rest of the gears operate just fine, how does this work?

Also, I have no idea how to change a thread title. Search function led me to lots of good threads about how to transfer/replace a title for the bike though.

Any moderator can change the title of your thread for you. I got it covered!
Thank you super moderator! Appreciate the help.
 
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