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Advance Weights and Springs: What Does "Worn" Look

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305explr
honda305.com Member
Posts: 76
Joined: Sun Apr 01, 2007 11:14 am
Location: Pennsylvania

Advance Weights and Springs: What Does "Worn" Look

Post by 305explr » Thu Feb 14, 2008 9:31 pm

Attached is a pic of my camshaft sprocket advancer with the advance weights open and under no tension. I slid the tips of two screwdrivers into the gaps to provide better definition for the camera lens. The screwdriver tips are not opening the weights any farther than the weights normally go while at rest.

Note the right one has a larger gap than the left (about 1/8'' vs 1/32'').

Does this amount of travel mean the right spring is worn? Or are the advance stops worn?

In Mr. Silver's manual, he states "if weights have worn advance weight stops, the advance travel distance of the point shaft will...cause overheating from excessive spark advance. Be sure that spark advance does not exceed 45-48-degrees TOTAL (includes the initial 5-degree advance) when the engine is running."

I'd like to be sure the cam chain tensioner is in good working order BEFORE I put the engine together, so answers to my above questions appreciated.

If I need to provide more info, just ask.

Thanks.
Attachments
advance weights gaps with ruler.JPG

LOUD MOUSE
honda305.com Member
Posts: 7817
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: Advance Weights and Springs: What Does "Worn"

Post by LOUD MOUSE » Fri Feb 15, 2008 7:05 am

I recommend you put the right side cam with the points cam in it into the sprocket assy and I think you will see that all is good. ...............lm

305explr wrote:Attached is a pic of my camshaft sprocket advancer with the advance weights open and under no tension. I slid the tips of two screwdrivers into the gaps to provide better definition for the camera lens. The screwdriver tips are not opening the weights any farther than the weights normally go while at rest.

Note the right one has a larger gap than the left (about 1/8'' vs 1/32'').

Does this amount of travel mean the right spring is worn? Or are the advance stops worn?

In Mr. Silver's manual, he states "if weights have worn advance weight stops, the advance travel distance of the point shaft will...cause overheating from excessive spark advance. Be sure that spark advance does not exceed 45-48-degrees TOTAL (includes the initial 5-degree advance) when the engine is running."

I'd like to be sure the cam chain tensioner is in good working order BEFORE I put the engine together, so answers to my above questions appreciated.

If I need to provide more info, just ask.

Thanks.

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