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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Wed Jun 29, 2011 10:14 pm 
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Rank: HRCS OG
Posts: 3599
Location: Central NY
Try premium fuel, my bro's Honda dirtbike falls flat on it's ass with anything under 91 octane. I've heard people say it's the corn juice they put in the gas now...

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Walt
04 RX-8 Touring Rebuild!
91 3000GT VR4
01 Tibb
Some people never have anything except ideas. Go do it.
Emissions & fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared.


Wed Jun 24, 2009 12:21 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Wed Jun 29, 2011 10:44 pm 
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Posts: 7589
Location: MA
Its got a full tank of brand new 93 octane in it. :(

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Wed Jun 29, 2011 10:44 pm 
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Location: Boerne, TX
How's the plug gap? Maybe the plug is worn out? Anything restricting fuel flow to the carbs?

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-Ryan
1989 R32 Nissan Skyline GTS-T 4dr
1999 Ford F350 7.3l diesel
1973 Plymouth Duster 318/A904 < 5.9L Magnum fuel injected
3 Race karts 2000 dodge Durango 4x4
2003 Subaru forester, 2002 Neon


Sun Nov 01, 2009 8:39 pm
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Wed Jun 29, 2011 10:49 pm 
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Rank: HRCS OG
Posts: 3599
Location: Central NY
NGK plugs, get the most expensive ones they sell that cross over to your engine.
Also check to see if the compression release (if any) isn't leaking.

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Walt
04 RX-8 Touring Rebuild!
91 3000GT VR4
01 Tibb
Some people never have anything except ideas. Go do it.
Emissions & fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared.


Wed Jun 24, 2009 12:21 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Wed Jun 29, 2011 10:56 pm 

Posts: 5
Location: High Point, NC
I would check for another vacuum leak somewhere, maybe the carb mounts.


Mon Jul 13, 2009 12:03 pm
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 7:18 am 
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Posts: 7589
Location: MA
Thanks for the ideas guys, keep them coming and I will keep you updated with progress as it is made.

- It has new NGK spark plugs (less than 500 miles)

- The fuel pump is the only thing in between the tank and the carbs. There is a possibility that it isn't pumping. Once I tear my muffler apart, and find nothing, I will put it back together, and remove the fuel pump all together.

- It has brand new carb-to-engine rubber manifolds (about 4 days old)

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 7:56 am 
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Rank: HRCS OG
Posts: 3599
Location: Central NY
Check the screen in the tank valve if there is one. They love to clog.

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Walt
04 RX-8 Touring Rebuild!
91 3000GT VR4
01 Tibb
Some people never have anything except ideas. Go do it.
Emissions & fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared.


Wed Jun 24, 2009 12:21 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 8:51 pm 
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Rank: Site Admin
Posts: 7589
Location: MA
- ok, I totally cut the muffler into a thousand pieces. Found nothing & welded it back together again. Crap.
- I tipped the bike over and broke the brake lever. Crap.
- I removed the fuel pump (It is only used because the lower part of the tank is lower than the carb bowls), and ran a straight hose from the tank (which is full) to the carbs. I poured gas all over myself, and reassembled. It made absolutely no difference.

Wrap-up: The stupid piece of crap will not run at 4000-5000 rpm. If you can finagle it past that rpm, it will rev fine to redline at 8000. It also revs perfectly when it is standing still. It only has this issue when you are riding it, which makes it a F'ing pain to diagnose.

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 9:33 pm 
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Posts: 1702
Location: Nashua, NH
ok who did you piss off???? I have not ZERO luck lately...

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Greg K.
1991 Galant Vr4
1988 Chrysler Conquest TSi (4g63 swapped)
1999 Jeep Cherokee Sport


Sat Dec 06, 2008 5:45 pm
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 9:42 pm 
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Posts: 7589
Location: MA
I have no idea what I did, but seriously, my vehicles are giving it to me hard this summer. I'm getting closer to my limit each day...

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jun 30, 2011 9:54 pm 
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Posts: 5682
Location: Boerne, TX
Put your wideband on it and see if it's a afr issue. If that's fine then it has to be a spark issue. Does it have a blue spark?

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-Ryan
1989 R32 Nissan Skyline GTS-T 4dr
1999 Ford F350 7.3l diesel
1973 Plymouth Duster 318/A904 < 5.9L Magnum fuel injected
3 Race karts 2000 dodge Durango 4x4
2003 Subaru forester, 2002 Neon


Sun Nov 01, 2009 8:39 pm
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Fri Jul 01, 2011 12:14 am 
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Rank: HRCS OG
Posts: 3599
Location: Central NY
Check the wring to the CDI box, and check the coil ground.
Also check the diode, if present.

Could be a weird resonance issue as well...

_________________
Walt
04 RX-8 Touring Rebuild!
91 3000GT VR4
01 Tibb
Some people never have anything except ideas. Go do it.
Emissions & fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared.


Wed Jun 24, 2009 12:21 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Fri Jul 01, 2011 7:24 am 
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Rank: Site Admin
Posts: 7589
Location: MA
Walt - I did take a long look at the CDI box, and didn't notice anything out of place. I will double check the coil grounds as well.

Ryan - The WBO2 is my game plan, but its currently being used to tune my truck. Kevin J. (Kjewer on here) declared my tune to be 95% there last night, so once I crank the boost up a few more psi and confirm all is still well, I'm going to pull the WB out and drop it in my bike. Great minds think alike!

Keep the ideas coming!

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jul 07, 2011 8:46 pm 
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Rank: Site Admin
Posts: 7589
Location: MA
Fixed it!

Here is what I did.....

Step 1) Pulled both idle screws out.
Step 2) Shoved guitar string in the holes. Yes, you read that right.
Step 3) Wiggled it, just a ... little ... bit.
Step 4) Removed guitar string.
Step 5) Shoved the carb cleaner tube in the hole.
Step 6) Sprayed vigorously while screaming.
Step 7) Removed carb cleaner tube and reinstalled idle screws.
Step 8 ) Adjusted idle screws according to service manual.
Step 9) Started engine & enjoyed for apprx 5 miles. Fun Times.

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Jeremy N.
1964 Impala Convertible
1972 Pontiac Lemans
2016 Subaru Impreza


Sat Mar 18, 2006 7:40 am
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 Post subject: Re: 1988 Honda Hawk GT NT650 Motorcycle
PostPosted: Thu Jul 07, 2011 9:08 pm 
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Rank: HRCS OG
Posts: 1702
Location: Nashua, NH
Sick! Lets ride!!

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Greg K.
1991 Galant Vr4
1988 Chrysler Conquest TSi (4g63 swapped)
1999 Jeep Cherokee Sport


Sat Dec 06, 2008 5:45 pm
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