Triumphrat

ridley_chris · 11-13-2009, 01:31 PM

Hello, I am having bike trouble on my 2005 Sprint st(15k miles). My last ride on the bike I was having surge problems with the fuel so I had the bike tuned up. After the dealer did their quick download on the bike it still had problems on the way home and since then it cracks when I try to start it. I did search the forums for the troubleshoot to this and read up on sprag issues so I decided to open up the side cover and take a look. The sprag appears to look like all teeth are in tact however when I turn the shaft with an allen wrench I noticed it is difficult to turn constantly. I have to pause for a second before I can turn the shaft. If I turn through the resistance I can hear a seeping sound from the block and then the resistance drops and I can turn for about 1/4th of a rotation before it starts again. This explains the surging problem I was having but now it wont start at all. I considered the problem to be the starter chain being too tight but the bike has 15k miles without any starter chain adjustments. Any ideas what the problem could be? Thanks in advance.

Pcdabbler · 11-13-2009, 06:16 PM

You need a new sprag clutch. It's slipping. The longer you leave it, the more chance of damage to the starter gears. The new one you buy will be a later style and will last much longer. You will smart for months about the price though ..

oldndumb · 11-13-2009, 07:14 PM

I'm having problems trying to understand what the OP is describing?

First off, just what was meant by "their quick download" that did not fix anything?

What does "it cracks when I try to start it" mean?

A visual inspection of the Sprag teeth will not reveal the condition of the interior sprags/dogs. It would have to be removed to do that.

And what is a starter chain?

The Sprag may well be slipping, but that has nothing to do with the "surging" problem" which was the original problem as I read it.

What do you mean by it will not start now? Is the starter spinning but not engaging the Sprag and turning over the motor? Or is the starter not spinning? Or is the starter turning over the motor, but it will not fire? Remember, these bikes need a fully charged battery with capacity to start properly.

ridley_chris · 11-15-2009, 01:59 PM

I had the triumph dealer install the TOR because I just upgraded my stock pipes to d&d pipes.

A loud pop comes from the right side of the bike when I hold the ignition down and never starts the motor.

I am trying to get to the interior sprags but I can't figure out how to take the sprag clutch off. (part#14 in http://www.bikebandit.com/2005-trium...17640sch568407 ). Plus I have a discrepancy with the diagram, Part#11 is an allen bolt not a M10X1 as described in the schematic. Turning this bolt also turns the chain behind the starter drive gears, I thought that was called the starter chain. I notice another allen bolt to the right of the sprag clutch rotate at the same time, sorry I don't see the part in any of the schematics. Maybe if I get a 2nd 5/16 allen wrench I can loosen the sprag clutch and disassemble because I tried everything else to loosen it.

Just prior to disassembling, the starter was spinning and not engaging the sprag. I can hear it spinning freely so I am assuming there are enough broken teeth to not engage the sprag at all. I know the battery is not the problem because I replaced it about 6 weeks ago with a Yuasa. Little off topic but I also just got the parts/wiring harness yesterday to upgrade the rectifier warden posted. I am going to go to an auto shop to pick up another 5/16 allen wrench, I think that might get me to the internal sprag.

CLB · 11-15-2009, 04:23 PM

Has the sprag *ever* acted up before this tune-up?

1) What is the configuration of your bike re: mods and what tune number did your dealer load. They should be able to give you the number.

2) Did they also change the oil? If so, what did they put in? The early sprags prefer 10w-40 to heavier oils.
Your symptom sounds like a slipping sprag. The crack is the sound of the sprag catching after the starter is spooled up. That's how gear teeth get broken. Stop tyring to start the bike until corrective action is taken.

3) Good deal. Your engine still has compression.

4) It is normal to feel resistance and hear hissing while manually cranking an engine through a compression cycle and does not explain the surging. See 3).

5) The starter does not have a chain. There is a multi stage gear reduction.
Since this started after a tune-up, I will ask again if the dealer changed oil. If so, you may want to try draining and refilling with a lighter grade. You may have to pull the sprag and soak it in the lighter oil before it will grab again. You may also go through the entire drill for not and still have the problem.

OR

It could be coincidence that the sprag gave up after this tune-up. If that is the case:
Part numbers and procedure are available on other threads here.

I am not sure why so many are replacing working rectifier/regulators.
The OEM part and connectors aren't the best but... Depending on your wiring expertise and chosen connection points, you could easily end up with a less reliable system after upgrading to a more reliable part. If you go ahead, consider this:

http://www.triumphrat.net/sprint-for...rectifier.html

Quote:

Originally Posted by ridley_chris

Hello, I am having bike trouble on my 2005 Sprint st(15k miles).

1) My last ride on the bike I was having surge problems with the fuel so I had the bike tuned up. After the dealer did their quick download on the bike it still had problems on the way home

2) and since then it cracks when I try to start it. I did search the forums for the troubleshoot to this and read up on sprag issues so I decided to open up the side cover and take a look. The sprag appears to look like all teeth are in tact however

3) when I turn the shaft with an allen wrench I noticed it is difficult to turn constantly. I have to pause for a second before I can turn the shaft. If I turn through the resistance I can hear a seeping sound from the block and then the resistance drops and I can turn for about 1/4th of a rotation before it starts again.

4) This explains the surging problem I was having but now it wont start at all.

5) I considered the problem to be the starter chain being too tight but the bike has 15k miles without any starter chain adjustments. Any ideas what the problem could be? Thanks in advance.