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Author Topic: "Doing it Right" or "How to Build a Functional Café Racer"  (Read 124455 times)

Offline Quintin Snell

  • Posts: 67
Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #210 on: Mar 05, 2015, 20:10:13 »
Sorry, i seem to have hijacked this thread, i can start a separate one...
Currently owned, in order of acquisition
1980 gs1000g
2008 gtr1400
1981 cx500

previously owned
1980 gs550e
1978 gs750d

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #211 on: Jun 27, 2015, 12:04:43 »
With a fresh rebuild, assuming already that everything is properly assembled, pre lubed, and has arrived at operating temperature while slightly above idle to build and maintain oil pressure:

-Never rev a new engine with no load on it.

- It is cylinder pressure that forces the rings into shape, and the piston travel that matches them to the bore. High RPM under load is the best way to achieve even cylinder pressure and high piston speed.

- after the engine is warm, you need to get to it. Be ready to ride, accidents can be more likely when focusing only on the task of seating the engine components at high rpm, road hazards still exist. Have a place to ride it like it needs to be ridden, a track if possible. Firing it up and whomping it up and down your block is dumb.

-Safely enter a rural highway or track. Briskly throttle and get out of first gear, take it to a grand under redline through second, third, and fourth gear. You dont want to be in the lower rpm when you get into the next gear up, get those shifts made quickly.

- At a grand under redline in fourth, let the throttle snap shut and roll down through the rpm until it gets to a safe rpm to downshift, repeat through third and into second. Using no clutch to downshift is recommended.

-After the initial runup, go WOT to redline through as many gears as you can without endangering yourself or others. Do not miss any shifts. Let the trottle snap shut, roll down through the gears safely to second, and repeat.

Your engine is ready. Go ride it however you want to now. Run it the way you want it to run.


burning bridges sometimes light the most productive paths

Offline Sonreir

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Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #212 on: Jul 03, 2015, 19:17:33 »
And DO NOT lug the engine.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline crazypj

  • Posts: 12483
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Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #213 on: Jul 13, 2015, 12:48:15 »
I warm up 'new' motor at 2,000 rpm to make sure the oil is being thrown everywhere it needs to go, minute or so at first start isn't so bad as there will be assembly lube on all moving parts
Too much idling is really bad though, usually causes problems with small end of connecting rod which tends to 'go dry' and scuff and/or have partial seizure (seen it many many times)
I also chamfer the bottom edge of piston thrust face to direct more oil inside piston (rather than have the factory square edge)
I think it also helps cool piston crown?
 Not as good as real oil jets but better than nothing  ;)
I think it may have been mentioned previously, it isn't a good idea to slather oil all over piston, rings and bore as your much more likely to get glazing of rings and cylinder.
It will bed in eventually but can easily take 20~30,000 miles
 I use only a tiny bit of oil on piston skirt thrust face and a smear on the front below rings
« Last Edit: Jul 13, 2015, 12:54:05 by crazypj »
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Tune-A-Fish©

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Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #214 on: Jul 13, 2015, 13:13:03 »
I don't know how a cycle motor off the showroom floor ever gets past the first 1K miles with all the stoopid furkers ridin em  ::)

The definition of torque is when you push down on a boner your feet come off the ground  ;D

Yup that's all nothing to add... great stuff here though and I learned a lots :o
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline crazypj

  • Posts: 12483
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Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #215 on: Jul 15, 2015, 17:05:48 »
In the 70's Honda made a films of bikes straight ff the production line being run through the gears and taken to red line before being dismantled and shipped
The main reason for 'break in' period was/is to try and get new riders used to new bike and it's foibles rather than a chance of engine damage
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Sideswipe

  • Posts: 85
Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #216 on: Oct 20, 2015, 22:12:40 »
I always wondered about the 'ideal' break in process - but without any tracks nearby I'd be concerned about running it through very many gears to redline!!  :-X

Offline hooligan998

  • Posts: 162
Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #217 on: Oct 21, 2015, 01:24:49 »
Sub'd for future reading.  Great info so far!

Offline Tune-A-Fish©

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Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #218 on: Oct 21, 2015, 08:22:26 »
I always wondered about the 'ideal' break in process - but without any tracks nearby I'd be concerned about running it through very many gears to redline!!  :-X

Leme just say... If you just rebuilt the ZX14... ramp up on the nearest I-? wring it to red through 6th gear your now at a silent cruising speed of about 210MPH... Luckily the bikes computer wunt allow for such fuckery lesst you swapped it out for a race chunk  :o
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline Psycrow

  • Posts: 78
Re: "Doing it Right" or "How to Build a Functional Café Racer"
« Reply #219 on: Jul 09, 2016, 14:53:12 »
I will admit strait up I have not read the entire thread YET but I felt it was important to comment on some of the things the  OP stated even though it was 2012 he made many great points and responses have added may more and I whole heartedly support the positive tone his post took however I have a big issue with one of his main points. I seriously think the definition of "Cafe Racer" needs to evolve somewhat.. cafes racers of their day were brittish twins modern in their own time and cut and modified to remove the unnecessary and mod the essential for maximum performance. If we apply that to today it would be doing the same to a late model GSXR.. if your going to extend the term beyond its origins an include 70's and 80's UJMs then you can't apply other rules to the term either.  What am I going on about? The attitude that if you don't over bore and port and polish your doing it wrong... I am getting so sick of this attitude and it's what keeps me from certain other boards with Cafe in the name....I strongly agree with function over form and the importance of making a bike mechanically sound before dumping money into esthetics HOWEVER.
Even with mechanical knowledge sorceing performance parts for these older UJMs are getting difficult. I see no requirement for someone posting a build thread focused on  estitics while also addressing mechanical issues. I think it's okay to take an old ugly bike from the past and keep it on the road and current with trends of the time and not chase some idea of performance that will never be achieved by the standards set by today's bikes. If someone takes a runner and tunes it up replaces worn parts and rotting rubber then starts making it look trendy where is the problem? Please do not look down on these people or call them less because they can't afford or have the desire to chase HP... can't it simply be a cafe because of the style the bike is aspiring to?

Psy

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« Last Edit: Jul 09, 2016, 14:59:19 by Psycrow »