13' Street Triple R strange cranking (video w/ sound) - Triumph675.Net Forums
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post #1 of 11 Old 05-13-20, 18:54 Thread Starter
SpaceCaptain
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13' Street Triple R strange cranking (video w/ sound)

Hey 675 fam,

My 13" STR was loaned to a buddy who one evening parked it at home in a garage and the next morning it failed to start. I picked it up and this is the noise its making. I compared it to the sounds my 14' 675R makes while starting and my very crude conclusions are the following:

1. The bike does not start (obviously), and makes a shorter, thumpy (cylinder?), crank sound.

2. The tach does not jump or tick when cranking, but neither does my working 675

3. Fuel is good, battery holding charge and crank amps. I have lifted the tank and checked fuel line and pump. Line seems to be feeding, and i'm hearing the pump work on every attempt.

4. When i crack the throttle open while starting, the thumping (cylinder?) sound is deeper. This leads me to belive that the engine is turning while failing to crank?

Is this particular sound familiar to anyone? Have i missed something very simple?
Please see attached video for sound in question.

Thanks


Old enough to know better, young enough to not care

08' Daytona 675 "Fireball TimidTurner" ***RETIRED***
13' Street Triple R "Slowface"
14' Daytona 675R Eslick ed. #44/47 "Gitsom5000"

Last edited by SpaceCaptain; 05-13-20 at 23:06. Reason: Updated
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post #2 of 11 Old 07-18-20, 19:29 Thread Starter
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Bump,

Can anyone shed any insight on this cranking sound? I can also hear the cylinder thumping

Old enough to know better, young enough to not care

08' Daytona 675 "Fireball TimidTurner" ***RETIRED***
13' Street Triple R "Slowface"
14' Daytona 675R Eslick ed. #44/47 "Gitsom5000"
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post #3 of 11 Old 07-18-20, 20:53
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Can you bump start it?

The sooner you introduce motorcycles into your children's lives, the less likely they'll have money for drugs, alcohol and cigarettes as teenagers.
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post #4 of 11 Old 07-18-20, 20:54
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It doesn't sound like your engine is turning over.

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post #5 of 11 Old 07-18-20, 21:44
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Agreed - it sounds like a gear or clutch sprag is stripped. Time to pull out the tools ...

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post #6 of 11 Old 07-23-20, 18:29 Thread Starter
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Quote:
Originally Posted by TTRIgnitionSystems View Post
Agreed - it sounds like a gear or clutch sprag is stripped. Time to pull out the tools ...
Quote:
Originally Posted by Renboy View Post
It doesn't sound like your engine is turning over.
Yes, it does not really sound like the the engine is turning, although i do hear some air thumping. My 675R works and does not sound at all like this.
This would be my first experience with a clutch sprag.

Thank you for the second opinion guys. I'll be opening it up soon. fingers crossed.

Old enough to know better, young enough to not care

08' Daytona 675 "Fireball TimidTurner" ***RETIRED***
13' Street Triple R "Slowface"
14' Daytona 675R Eslick ed. #44/47 "Gitsom5000"
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post #7 of 11 Old 07-23-20, 21:25
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Before grabbing any tools try to bump start it.

The sooner you introduce motorcycles into your children's lives, the less likely they'll have money for drugs, alcohol and cigarettes as teenagers.
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post #8 of 11 Old 10-30-20, 14:47
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Did you ever figure anything out on this? My 2013 is doing a very similar thing
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post #9 of 11 Old 10-31-20, 14:11
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Well, Just figured mine out...


I was coming up on the 12k service, so decided to go ahead and check valves & replace plugs while diagnosing the issue. Apparently my cam chain tension lost tension and the intake cam lost timing.


Previous owner put in APE cam chain tensioner, but they left off one of the nuts so it seems to have backed itself off. Hopefully I don't have a bent valve *sigh*

Last edited by MissedApex; 10-31-20 at 18:29.
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post #10 of 11 Old 11-09-20, 17:15 Thread Starter
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Quote:
Originally Posted by MissedApex View Post
Well, Just figured mine out...


I was coming up on the 12k service, so decided to go ahead and check valves & replace plugs while diagnosing the issue. Apparently my cam chain tension lost tension and the intake cam lost timing.


Previous owner put in APE cam chain tensioner, but they left off one of the nuts so it seems to have backed itself off. Hopefully I don't have a bent valve *sigh*
Thats a bummer. How did you discover your timing was off? Align to TDC and check the marks? i have not done it myself but i think this may be my issue now.

Old enough to know better, young enough to not care

08' Daytona 675 "Fireball TimidTurner" ***RETIRED***
13' Street Triple R "Slowface"
14' Daytona 675R Eslick ed. #44/47 "Gitsom5000"
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