4th gear slipping

[Betabquicker]

Hi all. I need some information on my 06 mastif. I have owned it since near new only 500 miles. I bought it in 2007 from Idaho and shipped it to New Zealand. I have had problems with 4th gear slipping most of the time I have owned it so it has only done just on 11000 miles. Seen as 4th is the main gear I tend to just ride my my v rod instead. So what causes the 4th to slip. The gear box is mint I have had it out and apart and back in and it was good for a couple of rides then slipped again. I just want to ride a hassle free bike. Please help

 

[Mickmorris]

Hi all. I need some information on my 06 mastif. I have owned it since near new only 500 miles. I bought it in 2007 from Idaho and shipped it to New Zealand. I have had problems with 4th gear slipping most of the time I have owned it so it has only done just on 11000 miles. Seen as 4th is the main gear I tend to just ride my my v rod instead. So what causes the 4th to slip. The gear box is mint I have had it out and apart and back in and it was good for a couple of rides then slipped again. I just want to ride a hassle free bike. Please help

Have you checked the shifter pawl to make sure it is set correctly?

 

[Mr. Wright]

It's putting more strain on the clutch. It's not the gear slipping, it's the clutch. Sounds like it's time for a new clutch.

 

[Mr. Wright]

Needing some help please

Good evening gentlemen - I apologize, I was on the site before under tcg186, but been a while and created a new account a while back. I have come across an issue I am hoping someone has come across before. I bought my 2011 mastiff in 2018 and she was rough. Always had a hard time with...

www.bigdogbiker.com

 

[Betabquicker]

No not the clutch... I have not done anything with the shifter pawl... I will have to look that one up

 

[Mr. Wright]

and again the clutch

Good afternoon. I bought a 2007 Mastiff. The bike only had 4,000 miles. The clutch was very tight. However, the gears shifted perfectly. It had a 12-plate clutch. I read all the threads about clutches on this forum and decided to install a 9-plate clutch and an Easy PulL clutch. I ordered all...

www.bigdogbiker.com

 

[Jwooky]

4-6 are helical cut gears which create side loading under torque. If the bearings are worn and you have mainshaft play the side loading will open up the clutch and slip. Likely time for a rebuild unfortunately. Exactly what mine was doing.

 

[HMAN]

As MrWright suggested. Check ur clutch hub nut. Prolly loose.

 

[Mikeinjersey]

Hi all. I need some information on my 06 mastif. I have owned it since near new only 500 miles. I bought it in 2007 from Idaho and shipped it to New Zealand. I have had problems with 4th gear slipping most of the time I have owned it so it has only done just on 11000 miles. Seen as 4th is the main gear I tend to just ride my my v rod instead. So what causes the 4th to slip. The gear box is mint I have had it out and apart and back in and it was good for a couple of rides then slipped again. I just want to ride a hassle free bike. Please help

Because you have had this problem virtually from the start, your issue is most likely a clutch failure. If your problem was in the transmission it would be missing shifts , popping out of gear, audible grinding etc. You state that your slipping is in 4th but I'm fairly certain 5th and 6th would be even worse.
A maladjusted clutch will slip under load. Another possibility ( less likely) is that the original plates were installed incorrectly. Because you have 11,000 miles on a clutch that has been slipping, it should be replaced.
You could try adjusting it first . These files will help you.

Dropbox

www.dropbox.com

 

[Betabquicker]

Hi. Thanksl for that but I don't think it is the clutch as it only does it in 4th gear under load and its not constant it is like its jumping a tooth on the cog or something. If I want to thrash it I give it heaps in 3rd then junp to 5th no slipping at all in any other gear. The only other issues i have ever had with it and I don't think that would affect it, is the main swing arm bolt sheared when I took off. That was when I first got it and I have gone through 3 sets of exhausts from vibrating and the hose clamp bracket breaking.
I think I will try the shifter pawl before I do anything else. Is there anything I need to know about that . Thanks

 

[Mickmorris]

Hi. Thanksl for that but I don't think it is the clutch as it only does it in 4th gear under load and its not constant it is like its jumping a tooth on the cog or something. If I want to thrash it I give it heaps in 3rd then junp to 5th no slipping at all in any other gear. The only other issues i have ever had with it and I don't think that would affect it, is the main swing arm bolt sheared when I took off. That was when I first got it and I have gone through 3 sets of exhausts from vibrating and the hose clamp bracket breaking.
I think I will try the shifter pawl before I do anything else. Is there anything I need to know about that . Thanks

Needs to be checked in 3rd gear.. It is easier to do with the top cover of the transmission removed. There’s a good video on YouTube from Baker Drivetrain’s .

 

[Mikeinjersey]

Hi. Thanksl for that but I don't think it is the clutch as it only does it in 4th gear under load and its not constant it is like its jumping a tooth on the cog or something. If I want to thrash it I give it heaps in 3rd then junp to 5th no slipping at all in any other gear. The only other issues i have ever had with it and I don't think that would affect it, is the main swing arm bolt sheared when I took off. That was when I first got it and I have gone through 3 sets of exhausts from vibrating and the hose clamp bracket breaking.
I think I will try the shifter pawl before I do anything else. Is there anything I need to know about that . Thanks

Your latest description Leads me to be thinking your problem is inside the transmission. Assuming you have already checked your drivebelt for worn or missing cogs and worn rear drive pulley. Check out the page 7-1 of the transmission pdf. It shows that the sliding member/dog is engaged into the 4th gear when in 4th and it is engaged into the 5th gear when in 5th. In all other gears it is centered and not driving at all. Considering your symptom, a slightly bent 4th-5th shifter fork preventing the dog from fully engaging the 4th gear is a probable cause. Less likely, but of course a possibility, the sliding member/dog or 4th gear itself could be worn or damaged. Both possibilities could be true since you have had the problem from when you first got the bike.

Dropbox

www.dropbox.com