Results 1 to 3 of 3
  1. #1

    Lean condition? 2001 gr1200r

    Trying to eliminate all possibilities before spending 600+ to rebuild carbs(nope, aint doin' myself!)..not sure where to start but will try to explain as much as possible, sorry if to much info and thanks for any help!!! First, compression is low but very equal, within a pound or 2 of 100.. how do these pics look? no sign of wash on pistons. here is what I've done
    1-replaced fuel filter
    2- removed flapper
    3-new head gasket
    4-installed d-plate
    5-changedd fuel selector switch
    6-checked for good spark with inline tester @wot
    cross hatching seems pretty good and PV's seem to cycle correctly
    last few times used ski runs great for 15 minutes or so, then maxs out at 40 mph, when usually it will hit 60. It starts right up and always sounds good on trailer, just under load can bog. It HAS had these symptoms immediately after launching but last few times it started AFTER being used for a bit..I'm thinking lean beacuse of the lower compression with only 78 hours on motor, lack of piston wash and completely black pistons and the bogging issue..not wanting to sound cheap but think I already have a lot more into this ski than its worth...
    ps- the domes also seem to be coated with a black epoxy, most I have seen are silver, whats up with that?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	P1010006.jpg 
Views:	108 
Size:	139.2 KB 
ID:	244234   Click image for larger version. 

Name:	P1010009.jpg 
Views:	60 
Size:	137.5 KB 
ID:	244235   Click image for larger version. 

Name:	P1010007.jpg 
Views:	66 
Size:	142.4 KB 
ID:	244236   Click image for larger version. 

Name:	P1010010.jpg 
Views:	68 
Size:	120.8 KB 
ID:	244237  

  2. #2
    icky002's Avatar
    Join Date
    Oct 2008
    i guess not what you want to hear, but you should rebuild your carbs. Are they stock? The pistons do look lean but most stock ones do.

    I think your compression is fine if it's close. It's most likely your gauge is off a little bit. But if your carbs are the issue at fault here, and they are clogged up, and you keep running it you will be loosing much more compression in a matter of seconds...

  3. #3
    yea, your probably right and thanks for reply!...just kinda odd how equal they are if something isn't right.....

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Will a new air set up cause a too lean condition?
    By sn-95 in forum 4-Tec Performance
    Replies: 3
    Last Post: 09-05-2011, 05:15 PM
  2. Lean Condition Causes? - GP1200R
    By orbit398 in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 07-21-2011, 02:21 PM
  3. 2001 GR1200R-Pull the Plug and swim off?
    By Pgreg in forum Yamaha PWC Performance (2-stroke)
    Replies: 12
    Last Post: 07-07-2011, 11:45 AM
  4. possible lean condition on 03 xlt PLEASE help with advice
    By mikerob1963 in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 05-26-2011, 11:14 PM
  5. Lean Condition?
    By FlSpearhunter in forum Polaris How To & FAQs
    Replies: 10
    Last Post: 04-26-2008, 02:13 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts