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post #1 of 39 (permalink) Old 04-23-2019, 02:47 AM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
Posts: 26
Angry Another starting issue

Hi all, another st1050 starting issue. I cranked my bike to start it the other day, it is normally a bit hard to start, however takes about two 3 sec cranks to start when cold. On about the 2nd or 3rd crank, the starter Motor changed pitch, sort of like 2 pistons were cranking instead of 3, and the bike would not fire. It did a couple of coughs and that was about it after many attempts.

The bike is a 2006 st, 60000 km on clock.

I pulled it apart thinking maybe it dropped a piston, but looking down spark plug holes all pistons appeared to be going up and down normally when cranking, looking into air cleaner ports, valves were also all working. I found that the 3 core plug from recently fitted cmos rr was all charred from poor connection, so did resistance check on rr and all appeared normal. I cut out plugs and reconnected wires with new spade terminals and tapped these all up to keep moisture out. No change to starter pitch or starting.

My thoughts were that the rr would not cause a change in starter pitch etc anyway as battery was fully charged.

I have fitted a new battery only a few weeks prior to this issue, so know that is all good.

About 12 months ago I changed starter cogs near sprag as the 16t one was stripped and a couple of teeth from the large one were smashed off. I recovered all teeth, so this repair was successful and have done about 10,000km since then.

I note that the bike has already had the sprag clutch upgrade to the heavy duty one, and this seemed to be okay when turning by hand etc.

I have just pulled the starter apart and it was a bit dirty, but brushes etc all in good condition and seems to operate normally when operating starter switch.

Not sure what to check next? Any ideas would be appreciated.
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post #2 of 39 (permalink) Old 04-23-2019, 05:24 AM
SuperSport
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Can you post a video?
What voltage on the battery?


Fred
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post #3 of 39 (permalink) Old 04-23-2019, 06:17 AM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
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Quote:
Originally Posted by fredsprint View Post
Can you post a video?
What voltage on the battery?


Fred
Hi Fred,
Voltage at battery is 12.75v
I will have to do video tomorrow as have just reassembled right side engine cover and need to refill with oil.
But starter still appears to be cranking fast, just a bit higher pitch, like itís pushing 2 cylinders instead of 3? That was my initial thoughts, there was no clunking or anything, just a sudden change in cranking pitch.
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post #4 of 39 (permalink) Old 04-24-2019, 02:28 AM
SuperSport
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Can you do a compression test then?


Fred
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post #5 of 39 (permalink) Old 04-25-2019, 03:35 AM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
Posts: 26
I put starter back together, now starter is free wheeling, and not turning engine over, have i put brushes in back the front making it spin backwards??
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post #6 of 39 (permalink) Old 04-25-2019, 03:39 AM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
Posts: 26
I donít have facility for compression test Fred, I doubt it has dropped a piston/ring, it only has 60,000 km on clock? The last ride I had was a 5000 km ride about 3 weeks before issue. Bike went like a dream.
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post #7 of 39 (permalink) Old 04-25-2019, 02:25 PM
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https://www.trademe.co.nz/Browse/Sea...estedCategory=

c21 NZ dollars seems very cost effective, is it a scam?
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post #8 of 39 (permalink) Old 04-26-2019, 02:57 PM
SuperSport
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Quote:
Originally Posted by Toddoh View Post
I donít have facility for compression test Fred, I doubt it has dropped a piston/ring, it only has 60,000 km on clock? The last ride I had was a 5000 km ride about 3 weeks before issue. Bike went like a dream.
Yeah but things go right before they fail. That's the way it is.


Fred
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post #9 of 39 (permalink) Old 04-26-2019, 11:46 PM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
Posts: 26
Thanks for the comments, that compression tester looks legit, tomorrow I am going to pull the starter motor apart and turn the brushes 180 degrees as stater is turning wrong way, so figure that is why. Will give it another crank over and see what it sounds like. If still sounds different I will record it and buy that compression tester next week
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post #10 of 39 (permalink) Old 05-03-2019, 08:43 PM Thread Starter
Grand Prix 125
Main Motorcycle: Triumph 1050 Sprint ST
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Join Date: Aug 2012
Location: New Zealand
Posts: 26
I have pulled starter apart again, looks like there is only one way to put brushes etc back on, starter turns clockwise? If this is correct I am not sure why engine won’t crank? Sprag Issue?
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