Need your help on this one, folks. - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 42 (permalink) Old 07-22-2019, 08:09 AM Thread Starter
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Need your help on this one, folks.

Hey everyone. I'm looking for some help on this particular problem. It seems very unique and uncommon because I can't find any other topics on it, whether vstar or any other bike. Basically bought this bike a few months ago and it runs amazing, except for one little flaw I noticed. If I drive the bike on the highway for over 20 minutes, then park the bike and go to start it again within 10 minutes, I get aloud TOC! noise coming from the engine on startup. I'm thinking starter clutch maybe, but I'm really really unsure on what this is. This never happens when just riding around town, or on cold starts. Only after riding the bike on the highway for awhile.

Work done on the bike so since June:
-Acquired Bike and noticed it ran a little lean
-Replaced K&N air filter with Stock, bringing air/fuel mixture back to normal
-Oil+Oil filter change
-Spark plugs changed
-Brake fluid flushed (Front and Back).
-Carburetor boots surface cracked. Sealed with High Temp Rubber Adhesive
-Carburetors taken apart and cleaned (clogged pilot jets)
-Carburetors synced
-Idle adjusted to 950-1050 RPM
-Fuel completely drained and replaced with fresh fuel
-Air Induction System removed
-Final drive oil changed

Here's a video on it. It might be hard to hear if you're listening on a cell phone, but basically you'll hear a TOC or CRACK noise right when my bike starts.


2003 Vstar 1100 Custom

The sun's shining, the birds are chirping; it's a good day.
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post #2 of 42 (permalink) Old 07-22-2019, 08:20 AM
KCW
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you lost me at TOC

?!

do you turn the petcock off when you park the bike?

if so, the float bowls may be boiling empty from the hot engine while it sits, you turn everything on, the floats are not full yet, engine starts up super lean?
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post #3 of 42 (permalink) Old 07-22-2019, 08:32 AM Thread Starter
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The best way to describe the noise is it sounds like a loud TOC!! ...hard to describe...

I don't turn off the petcock when i park the bike.

2003 Vstar 1100 Custom

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post #4 of 42 (permalink) Old 07-22-2019, 02:02 PM
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toc whatever that is... it sounds like a clunk aka kickback usually heard on startup and shut down. check the tps adjustment.i checked mine over the weekend and it was waay out of spec. i ordered one from partzilla $163.00, hope i made a correct decision.

Last edited by nick57; 07-22-2019 at 02:05 PM.
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post #5 of 42 (permalink) Old 07-22-2019, 02:09 PM
KCW
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something you did not mention

are you giving it any gas while starting it, hot... cold..choked.. ever?

dont know if you are aware, that is a known issue with the 1100 - if you give it gas while the starter is engaged it will back spin the starter clutch, and if you keep doing it the starter clutch will break.
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post #6 of 42 (permalink) Old 07-22-2019, 02:20 PM
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Quote:
Originally Posted by KCW View Post
something you did not mention

are you giving it any gas while starting it, hot... cold..choked.. ever?

dont know if you are aware, that is a known issue with the 1100 - if you give it gas while the starter is engaged it will back spin the starter clutch, and if you keep doing it the starter clutch will break.
And just to add to this, giving it throttle while starting does absolutely nothing to help it start better.

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post #7 of 42 (permalink) Old 07-22-2019, 02:27 PM Thread Starter
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Quote:
Originally Posted by nick57 View Post
toc whatever that is... it sounds like a clunk aka kickback usually heard on startup and shut down. check the tps adjustment.i checked mine over the weekend and it was waay out of spec. i ordered one from partzilla $163.00, hope i made a correct decision.
thank you, i will look into the tps adjustment since thats one bridge i have yet to cross.
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2003 Vstar 1100 Custom

The sun's shining, the birds are chirping; it's a good day.
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post #8 of 42 (permalink) Old 07-22-2019, 02:29 PM Thread Starter
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NortherRider, KCW, I have given throttle when starting it a few times when I first acquired the bike but quickly learned from the forum and the knowledge base that it's bad news for the starter clutch and have not done it since. But I'm sure the past owner has done it in the previous 41,000 kms of owning the bike so maybe that noise is my starter clutch acting up when its hot?
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2003 Vstar 1100 Custom

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post #9 of 42 (permalink) Old 07-22-2019, 04:36 PM Thread Starter
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Only thing I don't get, is if its the TPS, why is it only doing it when the bike is hot from a highway commute.

2003 Vstar 1100 Custom

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post #10 of 42 (permalink) Old 07-22-2019, 07:24 PM
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Look at poor attempt of a diagram below. Red arrows point to internal TPS contacts. The position sensor has a variable resistance potentiometer (or contact points, depending on model) that sends out varying voltage signals. When the contact points get worn the resistance is inaccurate. These are metal contacts and metal expands with heat also causing readings out of range. The blue shows that the internal sensor movement. I've rewritten this several time and can not come up with easier way to explain it. Come to my house and with my meter I can illustrate very easily. 😁 Hope this helps a little, if not google how to test TPS sensor for possible better explanation.


2001 Vstar 1100 Classic (sold), Cobra Slash Cut full exhaust, Dropped 1 inch with lowering links, ORK, 4.5 inch handlebar risers, Ultimate passenger seat, Passenger pegs moved forward 4 inches, Handlebar clock, KN air filter, Viking saddlebags, Additional rear lighting
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