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    Thread: build thread: 16v + cbr900 carbs + high compression

    1. Member yeayeayea's Avatar
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      03-09-2012 08:40 AM #106
      Yesterday. Drove it around the block the day before actually. The white oil pressure sender is leaking oil out the top, a new one should be here today. Other than that, and being low on oil for said reason, it seems to have weathered winter unharmed.

    2. Member yeayeayea's Avatar
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      03-13-2012 10:50 PM #107
      So I pulled the plugs because the car was still misfiring after a couple days of driving it. I found the #4 spark plug had a chunk of the porcelain missing. This was an old plug I threw in there a few months ago after breaking the porcelain on the previous spark plug.

      Two plugs, both with broken porcelain, both #4 cylinder. Any ideas? Im thinking it may be carb related, maybe a lean run situation that is making the plug extra hot, but I am pretty much clueless right now.

    3. Member mudanddust's Avatar
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      03-13-2012 11:20 PM #108
      can you post up good pics of the broken plugs and the plugs from the other three cylinders? also how many miles are on the motor, good and even compression?

    4. Member Jones84's Avatar
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      03-14-2012 02:03 PM #109
      I dont think its a carb thing. I have had the same thing happen in my low comp ABA 16v turbo. It was #4 as well.
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    5. Member yeayeayea's Avatar
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      03-14-2012 07:41 PM #110
      I can post pics of the broken plugs. I cleaned the other plugs with the wire wheel on my bench grinder so looking at them wont help much. The car ran awesome before the first plug broke, I spent a whole day drag racing at Bug Out (made it to the semi finals, like 8 or 9 passes ) The plug broke that time on the ride home from bug out actually, while on the highway. When I got home, I swapped in an old plug, which has now failed. I posted on NGK's facebook, and they recommended a plug for me, problem is I have not found it locally yet.

    6. Member lilredcabby's Avatar
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      03-23-2012 12:32 AM #111
      hey ma ur inbox is full and wont let me send any messages to you...clear up some space i have another question haha thanks.

    7. Member yeayeayea's Avatar
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      03-23-2012 05:59 AM #112

    8. Member mudanddust's Avatar
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      03-24-2012 09:57 PM #113
      finally got my new motor in the wabbit today, hopefully get it buttoned up and try to fire it tomorrow

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      05-18-2012 10:24 PM #114
      yeayeayea, I read the entire post but i didn't find how big you drilled the main jets for you cbr900 carbs... I read in this same post a drill bit sized at .178 but ... sounds to big to be correct...? Help?

    10. Member yeayeayea's Avatar
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      05-18-2012 10:42 PM #115
      I believe it was 1.73mm, not .173 inches. .173 inches would be much too big.

      At least that is what I wrote in the info for this video back when I was piecing it all together
      Last edited by yeayeayea; 05-18-2012 at 10:44 PM.

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      05-22-2012 12:37 AM #116
      I thought it might have been a bit much at .173, so 1.7... nice, thanks for the info!

    12. Member rysskii3's Avatar
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      05-22-2012 12:42 AM #117
      What is done to the engine to run 173?
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    13. Member yeayeayea's Avatar
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      05-22-2012 07:18 AM #118
      Quote Originally Posted by rysskii3 View Post
      What is done to the engine to run 173?
      1.8 16v, decked head, 3angle valve job, autotech cams, eurosport cat delete header, tt exhaust, no cat.

    14. Member rysskii3's Avatar
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      05-22-2012 10:03 AM #119
      Quote Originally Posted by yeayeayea View Post
      1.8 16v, decked head, 3angle valve job, autotech cams, eurosport cat delete header, tt exhaust, no cat.
      Hmm, I got very similar mods, with a few more little things, but I'm on 91 octane. I don't know of I should install the 170 or 175. And I got 2l
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    15. Member yeayeayea's Avatar
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      05-22-2012 04:38 PM #120
      I run 93 octane in mine. You also have R1 carbs where I have cbr900 carbs. I think yours are 40mm versus mine being 38mm. That said I would shoot for the 175's.

      The mains were the only thing I changed on my carbs, I left all the other jets alone. I did play with needle heights to dial it in some.

    16. Member rysskii3's Avatar
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      05-22-2012 04:42 PM #121
      Quote Originally Posted by yeayeayea View Post
      I run 93 octane in mine. You also have R1 carbs where I have cbr900 carbs. I think yours are 40mm versus mine being 38mm. That said I would shoot for the 175's.

      The mains were the only thing I changed on my carbs, I left all the other jets alone. I did play with needle heights to dial it in some.
      hmm, maybe i should get some 180 and 185. i do have mild p&p and TT 4 to 1 catless header.
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      06-10-2012 11:07 PM #122
      So how is it daily driving this?? Your dyno showed your HP and torq were slightly under stock until 5k rpm. I'm putting together an R1 carb setup but I'm afraid intown driving will suck, right?

      I have a 9a with ported head and an exhaust. I'd like to see if I can hit vr6 150 whp with some cams and maybe a header. Shouldn't be impossible.
      Need a 16V manifold flange to build your custom carb intake mani!?! I can get you one laser-cut for $85 shipped!!! PM me!

    18. Member yeayeayea's Avatar
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      06-10-2012 11:19 PM #123
      Well I broke my ankle back on may 6th, so the car hasn't moved since. But I daily drove it for a couple years. No problems, no air filters, all year round.

    19. Geriatric Member steveo27's Avatar
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      06-10-2012 11:29 PM #124


      Hope ya feel better chief. And hope to see ya around
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      06-10-2012 11:33 PM #125
      Quote Originally Posted by yeayeayea View Post
      Well I broke my ankle back on may 6th, so the car hasn't moved since. But I daily drove it for a couple years. No problems, no air filters, all year round.
      Sounds reliable. Ever left you stranded? I'd like to DD mine to work/school when I finish it.
      Need a 16V manifold flange to build your custom carb intake mani!?! I can get you one laser-cut for $85 shipped!!! PM me!

    21. Member yeayeayea's Avatar
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      06-10-2012 11:42 PM #126
      Quote Originally Posted by steveo27 View Post


      Hope ya feel better chief. And hope to see ya around
      Long time no see steve, still got the 12v?

      Quote Originally Posted by bmwquick View Post
      Sounds reliable. Ever left you stranded? I'd like to DD mine to work/school when I finish it.
      The only carb related problem I have had was a broken throttle cable that was made from a bicycle brake cable. The new cable I have has been problem free.

      Other than that, I have had two spark plugs, both on cyl4 break the porcelain. Also have had two oil pressure senders fail, the second one being a used one I got from a friend though. Only other problem was a radiator clog, the little vent line on the top of the rad was clogged, causing the radiator to get filled with steam vapor and overheat the car. Pretty tame for a 23 year old car that gets driven hard every time it is running.

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      06-10-2012 11:56 PM #127
      so slightly more reliable than mine. You said you may be able to hit 150 whp with some finer tuning, do you think that's possible? I would be very happy if I could get mine in the 145-150 zone without going for crazy cams..
      Need a 16V manifold flange to build your custom carb intake mani!?! I can get you one laser-cut for $85 shipped!!! PM me!

    23. Member yeayeayea's Avatar
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      06-11-2012 12:04 AM #128
      Quote Originally Posted by bmwquick View Post
      so slightly more reliable than mine. You said you may be able to hit 150 whp with some finer tuning, do you think that's possible? I would be very happy if I could get mine in the 145-150 zone without going for crazy cams..
      Im sure its possible. I literally have only played with needle heights for tuning. no syncing, no idle jet adjustments. But it runs well enough that I dont care to bother with it.

    24. Member OrangeDUB's Avatar
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      06-14-2012 03:35 PM #129
      What throttle cable did you end up using? Last time I asked I think your reply was a bicycle cable, but I see that didn't last.

    25. Member yeayeayea's Avatar
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      06-15-2012 11:41 PM #130
      Quote Originally Posted by yeayeayea View Post
      So its time to make a new throttle cable, since my bicycle brake cable finally died.

      I am using a honda hood release cable, as it has the right size barrel end for the cbr900 carbs


      It has a barrel on one end and a ball on the other, i cut the ball off


      next I cut the J hook off the stock cable, and drilled out the cable that was left crimped inside it


      Here is what ends I will have once I determine my length


      hopefully tomorrow I will cut it to the right length and crimp and solder the j hook on and have a nice new throttle cable with no cable clamps anywhere

      I think it came out of an early 90's honda accord.

    26. Member OrangeDUB's Avatar
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      06-19-2012 09:16 PM #131
      Thanks for the info. So did you get the Accord's steel cable to take the solder in? I can solder better than most and couldn't for the life of me get the OEM cable to take the solder, even with more than enough intense heat and plenty of flux.

    27. Member yeayeayea's Avatar
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      06-19-2012 09:22 PM #132
      cant say for sure, but I think it flowed in ok, at least into the hook. I crimped it first, so it may be the crimp doing all the work.

    28. 08-10-2012 09:46 PM #133
      with line is the main fuel line the top hose or the bottom

    29. Member OrangeDUB's Avatar
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      08-10-2012 10:22 PM #134
      Quote Originally Posted by marcabrams View Post
      with line is the main fuel line the top hose or the bottom
      The bottom is your fuel input. The upper 2 nipples that are between the carb pairs are your guel overflow/return, and the main big upper nipple in the center by the throttle cable attachment is a breather for the main venturi vacuum chambers, and that needs to breathe to atmospheric.

    30. Member yeayeayea's Avatar
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      08-25-2012 12:08 PM #135
      Soon


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      08-30-2012 07:05 AM #136
      I would like to convert, wish I hadnt sold
      My hayabusa carbs

    32. Member yeayeayea's Avatar
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      08-31-2012 05:15 PM #137
      I wouldnt mind stepping up to some carbs with a larger Throttle plate diameter. the cbr900 carbs are 38mm, i think R1 carbs are 40. Do you know how big the busa carbs are?

    33. Member OrangeDUB's Avatar
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      09-01-2012 02:35 PM #138
      Ever since I put carbs on my rabbit, I have since questioned why I didn't get hold of a digifant ECU with wiring and some injected motorcycle throttle bodies...

    34. Member yeayeayea's Avatar
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      09-09-2012 09:29 PM #139
      Quote Originally Posted by OrangeDUB View Post
      Ever since I put carbs on my rabbit, I have since questioned why I didn't get hold of a digifant ECU with wiring and some injected motorcycle throttle bodies...
      Well the carbs are a lot cheaper and simpler than going through all that hassle. But Fuel injected ITB's have a higher power potential if done right.

    35. Member yeayeayea's Avatar
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      09-20-2012 12:45 AM #140
      Say what!?


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