SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: renegade on August 03, 2011, 10:27:19 PM

Title: high rpm miss
Post by: renegade on August 03, 2011, 10:27:19 PM

Getting a miss around 4800 rpm. if i set the timeing at 8 degress i get a miss so i retard it to 4 degress the miss goes away but the motor will only turn 4500 rpm. what do you guys think distributor wore out? DID A COMPRESSION CHECK there all within ten pounds! distribuator is about 10 years old mallory YL with a ignitor 3 pentronics unit bran new                    . wondering if any of you ever hered of this before.

Title: high rpm miss
Post by: lbhsbz on August 03, 2011, 11:44:32 PM

What kind of motor are we dealing with? 

Title: Re: high rpm miss
Post by: renegade on August 04, 2011, 01:02:44 AM

big olds 468 ci

Title: Re: high rpm miss
Post by: HDriderTH on August 05, 2011, 07:00:10 AM

Set the timing at 36-38* at bout 2500 rmps. See how she runs on the top end

Title: Re: high rpm miss
Post by: SS-201 on August 06, 2011, 01:59:10 AM

If its intermittent Look for a loose ignition wire or connection, maybe even the switch has become loose inside rom vibration.

Title: Re: high rpm miss
Post by: mobboss on August 12, 2011, 08:43:47 PM

ok lets start with the standards. carfully look at the points they may be old or dirty. also when was the last time you tuned it up????

Title: Re: high rpm miss
Post by: renegade on August 13, 2011, 10:26:15 PM

No points, brand new pentronics ignitor 3 conversion.  but the distributor CAP is 10 years old!! replaced it with new runs good now..thanks for the imput guys. :banghead: