Like Tree0Likes

Rebuild time on HP500's?

Reply
Old 01-24-2006, 08:46 PM
  #1
Registered
Thread Starter
 
miamioffshore's Avatar
 
Join Date: Jun 2005
Location: Miami,FL
My Boats: Cigarette Cafe Racer
Posts: 246
Default Rebuild time on HP500's?

After how many hours is it recommended that you rebuild HP500's?

Thanks,

M
miamioffshore is offline  
Reply With Quote
Old 01-24-2006, 08:48 PM
  #2
Registered
 
JCPERF's Avatar
 
Join Date: Jul 2004
Location: Long Island,New York
My Boats: 10 foot Kayak
Posts: 8,908
Default Re: Rebuild time on HP500's?

Quote:
Originally Posted by miamioffshore
After how many hours is it recommended that you rebuild HP500's?

Thanks,

M
Depends on whos on the sticks. 300 hrs is a good time to freshen.If Budweiser played a roll in throttling then less

Last edited by JCPERF; 01-24-2006 at 08:58 PM.
JCPERF is offline  
Reply With Quote
Old 01-24-2006, 08:49 PM
  #3
Off the Radar
Platinum Member
 
Linster's Avatar
 
Join Date: May 2001
Location: Short Pump or Colonial Beach, VA
My Boats: 39 Cigarette Unlimited, 24 South Bay Tri-toon, & Seadoo GTX
Posts: 1,097
Default Re: Rebuild time on HP500's?

I still think 300 is the magic number, new rings, springs, gaskets, bearings & lifters. The 500 Carb's seem to be able to make it to 500 hours but I dont like to push things. It dont have as agressive as a cam as a 500EFI
Linster is offline  
Reply With Quote
Old 01-24-2006, 08:57 PM
  #4
VIP Member
VIP Member
Trade Score: (1)
 
Marginmn's Avatar
 
Join Date: Dec 2001
Location: Indianapolis, Lake Cumberland
My Boats: 38 Donzi ZRC, 29 Advantage XFlight
Posts: 3,474
Default Re: Rebuild time on HP500's?

A friend of mine had 330 hrs on his. They put in valve springs and she was good to go. Ran all of last season as strong as ever.
__________________
The Beak be gone
Marginmn is offline  
Reply With Quote
Old 01-24-2006, 09:12 PM
  #5
Registered
 
Join Date: Apr 2005
Location: Northeast Pa
Posts: 477
Default Re: Rebuild time on HP500's?

It is very common on HP 500's to have broken valve springs at 200-250 hrs.

Mike




Roccard Marine Engines
www.roccardmarineengines.com
[email protected]
570-956-2840
mike11 is offline  
Reply With Quote
Old 01-24-2006, 11:50 PM
  #6
Banned
 
Join Date: Feb 2005
Location: Cleveland, Ohio
My Boats: all
Posts: 1,460
Default Re: Rebuild time on HP500's?

I would agree 300-350 is a good number of hours for freshen. Of course everything has to do with like JC said how hard your are on them. And how good is your maintenance program.

Dean Gellner
mrhorsepower1 is offline  
Reply With Quote
Old 01-25-2006, 01:59 AM
  #7
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,752
Default Re: Rebuild time on HP500's?

Do a leak down test to check the health of the engine. A general rule for average use would be top end refresh at 200-250hrs and full rebuild at 400-500hrs.
Griff is offline  
Reply With Quote
Old 01-25-2006, 11:02 AM
  #8
Registered User
 
BAJA WILL's Avatar
 
Join Date: Feb 2001
Location: Tampa, Indian Shores Beach
My Boats: Don't even mention the word boat
Posts: 3,300
Default Re: Rebuild time on HP500's?

I replaced my valve springs at around 370 hours already had a inner spring broken, no damage though. I am around 450hours now and don't plan on replacing my lifters until 550-600 hours. Very little time running WOT. I was told by multiple builders that these motors babied could get 1000 hours before a full rebuild?? Oh well I had the leak down test done at 370hours and the mech said it was still with in tolerences of a new motor? what ever that meant

WILL
BAJA WILL is offline  
Reply With Quote
Old 01-25-2006, 12:43 PM
  #9
Platinum Member
Platinum Member
 
ApachePete's Avatar
 
Join Date: Aug 2001
Location: Sarasota,FL & Saugatuck, MI
Posts: 1,044
Default Re: Rebuild time on HP500's?

Mine made it to 400 hours, with new springs @ 200.

Then, lost a valve seat in one cylinder. But that was the result of leaking headers. Unfortunately, both motors had leaking headers, so both needed complete rebuilds.

If it weren't for the headers, I think the motors had many more hours in them.
ApachePete is offline  
Reply With Quote
Old 01-25-2006, 02:50 PM
  #10
Registered
 
BajaRunner's Avatar
 
Join Date: Nov 2001
Location: Austin
My Boats: I aint got $hit
Posts: 3,622
Default Re: Rebuild time on HP500's?

Mine are at 350. Im having the top ends rebuilt. Ive heard the bottom end is good for awhile.
BajaRunner is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
LostinBoston
General Q & A
19
11-30-2007 05:14 PM
KDAWG
Baja
7
06-11-2007 09:32 AM
28Eliminator
General Q & A
24
05-25-2007 10:51 AM
Thunder Struck
General Q & A
12
08-30-2006 11:29 AM
Shooter
General Q & A
1
08-15-2004 06:47 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:10 AM.


Copyright 2011 OffShoreOnly. All rights reserved.