Any Honda Dominator NX650 owners out there ?

Discussion in 'Thumpers' started by KeithDommirider, Jul 31, 2007.

  1. McVick

    McVick Been here awhile

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    Hi gang!

    Can someone tell me where the C.D.I. unit is located?

    The service manual indicates that is is located under or as part of the ignition switch unit (where you put the key).
    What I see is a round shaped unit under the ignition switch. Is this it?

    Thanks
    Brian!
  2. FLICKIT

    FLICKIT Been here awhile

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    Right hand side of the headlight, it's the larger black box....

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    Good Luck :)

    Edit:
    The CDI is a common issue, some say giving it a decent tap on the back with something like a screwdriver handle can get them going again, temporarily..

    CDI repair info:
    http://www.advrider.com/forums/showthread.php?t=684756

    www.cyclecentralpowersports.com seem to do them at a reasonable price:
    MODULE, IGN CONT
    30410-MN9-791
    $92.51

    :)
  3. McVick

    McVick Been here awhile

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    Awesome FLICKIT!

    Thank you!!
  4. jgrooms

    jgrooms Been here awhile

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    Idle jet often synonymous with slow jet, but you are correct I think in this case the SM calls it slow. The only two that are screwed in. Don't have the SM at hand, but up one size from stock. The number increases are larger than one, but the next size larger (richer). The bike is super lean. Jets R Us has good resource listing. Also earlier posts in this thread have jetting experiences.
  5. FLICKIT

    FLICKIT Been here awhile

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    I'm in the process of giving the old girl a bit of a rebuild ready for a ride around Australia later in the year... It was using a fair bit of oil....

    I posted some pics in the XRL thread to get some opinions, I might as well post them here also for anyone that's interested...

    It seems a previous owner has replaced the cam-chain, rings, and given it a rough hone at some stage....

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    Patent pending valve spring remover :huh (someone borrowed my real one years ago and I never saw it again)
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    I'm thinking the cam and rockers will be ok, they seem unchanged since I had the valve cover off 7000km ago...

    There seems to be a little slop in the valve guides so I'm expecting to have to replace them..

    Valve stem diameter: (mm)
    IN Standard = 6.575 - 6.590 .. Service Limit = 6.56 ... Mine = 6.578
    EX Standard = 6.565 - 6.575 .. Service limit = 6.55 ... Mine = 6.552 (right valve at the narrowest bottom of the guide area (the left is a little bigger at 6.565)

    The Exhaust valves are pretty close to the service limit, I'll see what the machine shop say, I'll probably replace them...

    I'll probably do a re-bore, oversize piston/rings, piston pin/clips, valve guides and maybe valves... I'll pull the clutch and oil pump apart over the next couple of days and measure/inspect them... I might replace the seals and thrust washer in the oil pump and replace the oil seal on the end of the crank...

    Comments and suggestions welcomed.. Can anyone think of anything else I should be looking at while it's all in bits?

    Thanks :D
  6. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    Those bearing surfaces look really scored. I know some times photos make things look worse than they are. Can you feel those groves when you run your hand over them? Here is the US there is a company that will weld them up and machine them back down for, I think, $150. Maybe there's a similar company on your part of the planet?

  7. McVick

    McVick Been here awhile

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    I found the CDI.
    Hit it with the handle of a screwdriver a few times and the bike fired right up with one touch of the magic button! :wink:

    So, likely finding the issue, I pulled the CDI off the bike.
    I could not find my dremmel tool so I used a straight edge and a box cutter to slice along the base of the curved edge on the CDI. About 10 minutes of delicate work and I had a nice open CDI unit.

    Then for the hard part - picking all that rubber sealant material out!

    That's where I am now, I got about 90% of the sealant picked out last night but need to get the rest out and clean the board with something appropriate.

    Then I need to find my magnifying glass!

    My plan is to order a new one but my curiosity gets me so I am tinkering with the current one and hoe to fix it and have it as temporary while waiting for new and then as a spare.

    Brian
  8. FLICKIT

    FLICKIT Been here awhile

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    There's a couple of scratches, they're not bad really, they don't really concern me, they seem unchanged since I had the valve cover off 7000km ago... I think it will be ok ...

    What caused the scoring was probably lack of oil... When I got the bike it was barely pumping oil, if at all, (I didn't run it long enough to see exactly how much it was pumping)... A previous owner had unbolted the oil pump and hadn't tighten it back up, the bolts had worked their way out and the heads were running against the back of the drive gear :huh The heads of the bolts were a bit polished..
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    I bought the bike sight unseen, first thing I did when I got it was check the oil, the tank was empty so I ran the bike for about 30 seconds with the head oil feed bolt cracked open and the dipstick out... Only a slight dribble of oil came out of the head oil feed, and when I turned the bike off the oil in the tank gurgled back down into the crank in a couple of seconds... It was clear there was oil pump issues so I pulled the right cover off and found the above pictured issue.... Also, the little pipe that goes between the oil pump and the side case was missing :huh .... VERY LUCKY there wasn't more damage.... Some people shouldn't be allowed to work on motorbikes, lol...

    :)
  9. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    How did you know there was supposed to be something there? A number of people loose that piece during rebuilds and never know its gone.
  10. FLICKIT

    FLICKIT Been here awhile

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    I search for internal photos before pulling it apart... found this great thread:
    http://advrider.com/forums/showthread.php?t=713831

    Great being able to see what's inside before diving in :D

    With the oil pump bolts coming out and the dowel missing I don't think the pump was sealing too well against the cover ... It was no surprise there seemed to be next to no oil flow to the head...

    :)
  11. McVick

    McVick Been here awhile

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    I went to work on the CDI tonight.

    There were a few solder joints that looked cracked at the base.
    I use some solder wick and a solder iron to suck the old solder out of the bad joints and then I re-soldered them.

    I put the CDI back on the bike, without re-sealing it and the bike started 10 for 10!

    Now I'm trying to decide how to reseal the CDI unit and affix the cover back on.
    I don't want to re-goup it all up with silicone at this point. Since I have never done this before I have no idea if I did it 100% correct and I want the flexibility to get back into the CDI if needed.

    Any thoughts on non-permanent sealing of the CDI?
  12. FLICKIT

    FLICKIT Been here awhile

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    Congratz on the repair! ...

    Maybe just a couple of layers of duct tape or electrical tape over the board so the solder joints aren't hard against the plastic back, then tape the back on with electrical tape to seal it up... or a bead of silicon sealant or hot melt glue around the edge to seal it ... As long as it's sealed and water cant get in it should be right...

    :)
  13. McVick

    McVick Been here awhile

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    Thanks
    Good ideas
  14. FLICKIT

    FLICKIT Been here awhile

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    Just pulled my oil pump apart for a measure & inspection, it didn't look too bad to start with then I looked at the tips of the inner rotors.... She's digested some decent chunks at some stage!

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    I'm not sure how bad these can be and still be ok, the clearances seem within the service limits, and the alloy housing isn't too bad...

    New rotors are about $45 + about $10 for seals.... I'm tempted to just throw $93 at a whole new pump :D

    All comments welcome :D
  15. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    A replacement pump is certainly the way to go. If you put this one back in and it doesn't work right, you're looking at another complete engine rebuild. There's a good chance you can find a cheap pump on eBay. You should figure out how junk got sucked into the pump. If there's a problem with the pickup screen then you are likely to ruin another pump
  16. FLICKIT

    FLICKIT Been here awhile

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    The screens seem intact so I'm not sure how the chunks have made their way through.... You'd have to assume it's been more than just bits of alloy to do this sort of damage to steel , it's a bit of a worry... Both pumps have similar damage...

    Being a 20yo bike with 60,000km on it, this damage might have happened long ago... The screens may have been replaced...

    I've done a few oil changes, I always drain the oil into cut down coke bottles and check for metal, I've never spotted anything to be worried about, so I have to assume the damage to the pump is old...

    Can anyone think of anything else I should check/replace while I have the engine apart? (I'm not splitting the cases)

    Thanks :)
  17. Andy UK

    Andy UK Adventurer

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    Flickit, have you checked the clutch basket for indentations? My 88 Dommie had bad dents from the clutch plate lugs and the drive teeth of the alloy slip rings, just file them out. I did have to hold the front brake on when putting the bike into gear, now I have almost no drag at all. Also suggest you cut the old oil filter open to see what it has caught at your next change.
  18. FLICKIT

    FLICKIT Been here awhile

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    Thanks Andy... Yep, my clutch basket has indentations, I was going to ask if it was ok to file them out :D

    The clutch plates are basically new but it has never felt quite right, probably due to the indentations...

    Good idea with the oil filters... I still have the last 2 old filters sitting in a container, I might cut them open later today for a look ...

    Thanks :)
  19. Underground

    Underground unbefuckingbelievable

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    FLICKIT,I'd be interested to know where you scource part for your rebuild
    I think I'm up for piston,rings and some head work shortly as mine is using about 1litre per 1000km and more if I really hammer it.
    Found these guys http://www.motocrossparts.co.nz/motoxspares.php?category=93&brand=107&page=2&piece=1401 in your neck of the woods.
    Anyone else tried these high comp type pistons without getting carried away with any other serious engine mods?
  20. FLICKIT

    FLICKIT Been here awhile

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    I use these guys in the US: www.cyclecentralpowersports.com

    The minimum shipping is a bit pricey, around $80 to Australia, but it's not bad if you're ordering quite a bit of gear... Their parts prices are significantly less than anyone else that ships to Australia...

    :)

    Edit: This site lists the parts for all the NX models so I use them to double check that the US 89 model parts are the same as my 92 Aussie model: http://www.cmsnl.com/honda-nx650-dominator-1992-australiakph_model3915/partslist/ ... If any parts I need aren't in the 89 parts fish I get the part numbers from cmsnl, then search cyclecentralpowersports, 9 out of 10 times they have them...