Recent content by harley497

  1. H

    1991 cb750 nighthawk brat

    I know its somehow not too much followers and commenters of this build but the bike came out real nice. Figured out pretty good carb setup for my intake and exhaust configuration. Still some small adjustments to go before its fully done! https://youtu.be/74DWekdXBwQ...
  2. H

    1991 cb750 nighthawk brat

    Time flies very fast, a year passed and I hardly noticed! Had to rework/reweld forward tank mounts (on finished and painted frame%)) to bring tank closer to frame and more level. Went through several iterations of seat and muffler too.. But seems to be pretty fine and close to a first really...
  3. H

    1991 cb750 nighthawk brat

    Yesterday my little sweet frankenstein saw public road for the first time. Temporary wooden seat is hardcore looking but surprisingly pretty ridable!!) Tank is not in a final position.. Exhaust turned out to be way too loud, gonna put baffles or replace whole thing.. Idle and up to 3-4k runs...
  4. H

    1991 cb750 nighthawk brat

    Last couple month was real fun. After first engine top end rebuild, compression was no more than 110psi and while engine was running good on idle, I also observed strange behavior like self revving from 2k to 4k and spitting/exhaust fire after 5k. Given low compression I decided that I probably...
  5. H

    1991 cb750 nighthawk brat

    Ok got another craze. Does the tank sit pretty?? Front part positioned higher than I expected and overall a bit uptwisted look.. Doesnt seem to follow seat line well.. Or I just need to take a timeout..)) But maybe lift rear part of the tank a bit..
  6. H

    1991 cb750 nighthawk brat

    on 91' cb750 ignition timing is fully electronic and non adjustable as per manual.. but sure will get the strobe and check the timing, thanks for the hint
  7. H

    1991 cb750 nighthawk brat

    Ok so mechanically bike is ready and its time to tune the carburetor. I did full disassembly/cleaning/rebuild kit quite some time ago.. Back at the time decided to put 38 (vs 35 stock) slow jet and 120 (vs 110 stock) main jet assuming there will be no stock airbox and straight pipe.. Having...
  8. H

    1991 cb750 nighthawk brat

    custom downpipe bought by chance from friend of mine, just welded in sensor port.. exhaust looks version 1. totally wasnt sure on exhaust setup.. since its was a readymade downpipe, didnt mess too much and just fixed the muffler. so far so good.. otherwise would route closer and more parallel...
  9. H

    1991 cb750 nighthawk brat

    Some highlights as assembly is going on.. udnerseat electrics tray, diy welded aluminum custom harness and connectors.. stop/running light/blinkers location, weld-in nut front end status so far.. digging the motogadget's dial!!! breathers 'airbox'. well sort of.. btw very tight...
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    1991 cb750 nighthawk brat

    Ok so frame been finished a while ago, repainted and now assembly is in the progress. So far so good. Rear shocks probably too long but will see later. New foot controls and kickstand look good..
  11. H

    1991 cb750 nighthawk brat

    Finally, it's alive! What a milestone for me, works pretty fine, a bit unexpected though) https://youtu.be/YuMYBPL8hgY
  12. H

    1991 cb750 nighthawk brat

    Slowly but surely.. Seat subframe tacked finally in right place, electrics fully done, handlebar done, seat ready for upholstering.. Next few days hope to fire up engine first time after top end overhaul..
  13. H

    1991 cb750 nighthawk brat

    Ok so loop has been cut. With half-inch plywood in between already looks much better. Unfortunately not enough 'meat' or will be unpretty with existing downtubes. Already bought another frame, going to replace whole struts. Wasnt sure about seat length, seemed a bit too long. But with friend...
  14. H

    1991 cb750 nighthawk brat

    Aah it looks I made a huge mistake back at the time of seat loop installation!! Frame was sitting flat top on the floor and I was leveling seat subframe with frame's bottom tubing.. As it turns out, with suspension and wheels on, frame is tilted with front upwards = my seat loop is totally...
  15. H

    1991 cb750 nighthawk brat

    Ok so electrics (version 1 at least) seems pretty much done now With starter relay found its place under seat And some connections towards handlebar hidden under the tank.. And new tacho looking awsome.. With seat pan, looks clean and nice.. And tank finally sits properly in place...
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