Jump to content

a smoky TR280i


tsiklonaut
 Share

Recommended Posts

My 2013 TR280i has started to smoke recently, any idea what might be the cause? 

Doesn't run so well as well and it doesn't seem to be the fuel mixture issue, I've tried with a different fresh fuel/oil mixture and still the same.

I figure it's maybe a gearbox oil leaking slowly into crankcase room, but where that leak might occur, a bad crakshaft seal in one side? Any ideas?

Link to comment
Share on other sites

 

 
 
 

I think I could tell by the smell if the bikes using transmission oil imagine the exhaust would be a bit dribbly too.

About 3 years ago mine went right of song like a regular bike running with the choke on. Must have felt brave and adjusted the sensor by hand mind you I didn't totally slacken it just enough as move it a minute amount.

Just listening to the motor until it took throttle nice and clean and set it at that.

Can't even mind which way I moved it but it'll be obvious if you give it a go and mind to mark the original position.

Anyway I take no responsibility for this post if you destroy your motor all I'll say is mine's still perfect after all this time and it's done a load of work.

What could possibly go wrong! 

  • Like 1
Link to comment
Share on other sites

 
 
 
 

I have worked on a couple of Ossa motors that smoked a lot, both had the following problem. On your motor on the crankshaft LHS, the needle roller main bearing runs on a thin steel sleeve which is a shrink fit on the 25 diameter crankshaft. The sleeve was under stress and ended up with a hairline crack, hard to see, that allowed gearbox oil to be drawn into the crank case. The sleeves are not available if yours is cracked, but you might be lucky and perhaps the oil seal has failed on the RHS of the crankshaft. If there is a hair crack on the sleeve, you can always fit the later model LHS inner plate with ball race, that runs on the 25 diameter crankshaft, so the sleeve needs to be extracted - easy if it is split. If the RHS seal has failed, which would be uncommon, then you have no option but to replace the main bearing and seal. Yes, it is a very lengthy job, and needs some setting up to put back together, but it is possible. Bye, Peter B.

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

 

Is your oil low? Were all the bolts on the mag side crank plate tight? I have seen the gasket fail, you cannot tell until you remove the plate, seeing as you have to go in from that side anyway I would remove the plate and check before pulling the crank. With the plate removed you may also be able to See if there is any excess oil in the crank case 

Edited by canada280i
  • Like 1
Link to comment
Share on other sites

 
On 15.8.2018 at 10:37 AM, peterb said:

I have worked on a couple of Ossa motors that smoked a lot, both had the following problem. On your motor on the crankshaft LHS, the needle roller main bearing runs on a thin steel sleeve which is a shrink fit on the 25 diameter crankshaft. The sleeve was under stress and ended up with a hairline crack, hard to see, that allowed gearbox oil to be drawn into the crank case. The sleeves are not available if yours is cracked, but you might be lucky and perhaps the oil seal has failed on the RHS of the crankshaft. If there is a hair crack on the sleeve, you can always fit the later model LHS inner plate with ball race, that runs on the 25 diameter crankshaft, so the sleeve needs to be extracted - easy if it is split. If the RHS seal has failed, which would be uncommon, then you have no option but to replace the main bearing and seal. Yes, it is a very lengthy job, and needs some setting up to put back together, but it is possible. Bye, Peter B.

I checked the LHS hasn't leaked into magneto chamber, but I remember there was an oiling channel for the LHS crank needle bearing when I did an overhaul last winter, so in theory it could leak from the oiling channel into crank chamber as explained by you w/o leaking into magneto chamber at the same time (leaks only to one side).

I guess I have to pull the LHS crank plate off to observe? 

Can't remember how I did it last time, but I remember it was a PITA to get it off w/o special tools. Any good tips on removing the LHS crank plate?

 

21 hours ago, canada280i said:

Is your oil low? Were all the bolts on the mag side crank plate tight? I have seen the gasket fail, you cannot tell until you remove the plate, seeing as you have to go in from that side anyway I would remove the plate and check before pulling the crank. With the plate removed you may also be able to See if there is any excess oil in the crank case 

 

Can't tell from the oil consumption since it tends to vary on mine (thick transmission oil get's stuck on gears etc). Will see if I can remove the crank plate, let me know if anyone has a good trick how to pull it with normal tools!

Edited by tsiklonaut
Link to comment
Share on other sites

 

The 2013 motors have a tighter tolerance between the inner plate and crank case and need to be extracted reasonably squarely. To remove the inner plate, remove the 3 stator bolts and hang the stator out of the way, then all of the plate bolts too. You need 3 long M5 allen bolts and a steel plate with a centre bolt, and 3 holes that match the stator bolt circle diameter (BCD) Use this set up to carefully extract the plate. I'll have a look for my extractor set up and see if I can get a photo of it on here. Some measurements too. Bye, Peter B.

  • Like 1
Link to comment
Share on other sites

 
 

Here are a couple of photos of the inner plate puller. Originally made for a Scorpa (Yamaha motor) flywheel puller, then modified for the Ossa using the inner 3 holes. The BCD, not accurately measured, is 42.0mm, check your stator hole placement. M5 bolt length = 70mm. Hard to see the third inner hole on the photo. (Two sets of 3 holes) Plate is 6mm. Hope this helps. You should be able to get someone to make up one of these. With the centre screw puller, make sure it does not damage the M10 thread at the end of the crank, I use a nut in between. Bye, Peter B.

5b753e7e220a4_Photoon16-08-18at8_57PM.thumb.jpg.01f864496d30e476f0d0a1778fd6fef1.jpg

5b753ecf665f3_Photoon16-08-18at8_55PM.thumb.jpg.cb6ef15305345948a8bc0df486fadda2.jpg

 

  • Like 1
Link to comment
Share on other sites

 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...