Author Topic: Building of a CB500 classic racer  (Read 207415 times)

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Offline Howell

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Re: Building a CB500 classic racer
« Reply #275 on: April 26, 2010, 10:01:51 AM »
Dutch Open Classic race at Spa-Franchorchamps 25-04-2010

Finally no problem with the engine this time.
My son finished ninth battling with Colin Stockdale for a couple of laps.
A very goog result I think for his first complete race on this bike.
Colin didn't finish , his headgasket was blown out and at that moment my son was in front of him.
But that 'old ' man is pretty fast and his bike is very noisy , produced the most decibels of the classics.
We had beautiful weather conditions and drunk a 'couple' of beers together with Colin and friends.
Our friend (no.5) finished fourth.
So this was a very satisfying weekend for us.
The next race will be at may 16 , we are looking forward to it.
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Offline mec

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Re: Building a CB500 classic racer
« Reply #276 on: April 26, 2010, 11:35:58 AM »
Dutch Open Classic race at Spa-Franchorchamps 25-04-2010

My son finished ninth battling with Colin Stockdale for a couple of laps.

please give us some infos on the laptimes.

mec
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Offline turboguzzi

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Re: Building a CB500 classic racer
« Reply #277 on: April 26, 2010, 01:26:43 PM »
Good to hear howell and congrats!

nice race transport too ;)

What did Yrjo think about your "old racer"?

sounds like we all should find a race now in central europe for a sohc4 HiPo forum championship!

bummed to hear about Colin, DNF's suck.... at least he made a few cows deaf :)

Where's next race?

cheers

TG

Offline bwaller

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Re: Building a CB500 classic racer
« Reply #278 on: April 26, 2010, 02:44:32 PM »
Yes well done Howell and Yrjo. A bit of bad luck for Colin after making the effort to get there.

Man it's great to see so many entries.

Offline MaaseyRacer

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Re: Building a CB500 classic racer
« Reply #279 on: April 27, 2010, 10:05:45 AM »
Howell,

I am curious as to why you chose to run such a small offset on your fork?


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Offline Howell

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Re: Building a CB500 classic racer
« Reply #280 on: April 27, 2010, 11:54:45 AM »
Howell,

I am curious as to why you chose to run such a small offset on your fork?




That's because we want to have a quick steering bike but also stable, we use longer shocks to put the bike higher on the rear side and also an 18 inch frontwheel.
The headangle changes by this.
With the small offset we create a longer trail for stability.
In Spa we changed the setup and put the bike higher ( 1cm) in front, because the bike was wobbling in the fast corners.
This made a big difference , the bike was much more stable.

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Offline Howell

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Re: Building a CB500 classic racer
« Reply #281 on: April 27, 2010, 01:25:12 PM »
Good to hear howell and congrats!

nice race transport too ;)

What did Yrjo think about your "old racer"?

sounds like we all should find a race now in central europe for a sohc4 HiPo forum championship!

bummed to hear about Colin, DNF's suck.... at least he made a few cows deaf :)

Where's next race?

cheers

TG

Hi TG,

Yrjo, has now confidence in the bike and likes riding it now.
But the greatest difference are the drumbrakes for him , he never rode before on a bike with drumbrakes and now he has to use musclepower to brake instead of the onefinger discbrakes from Brembo or Nissin he was used.
The next race is in Hengelo Holland , that's a normal road track:http://www.hamove.nl/wegrace.php
Action pics , type in  nr 54 :http://www.gbphotosports.com/modules/myphotos/album.php?id=SPA_BIKERS_TROPHY/04_CLASSICS
« Last Edit: April 27, 2010, 01:27:12 PM by Howell »
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Offline iomtt9

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Re: Building a CB500 classic racer
« Reply #282 on: April 27, 2010, 01:40:45 PM »
When you go home we stayed another night and i take the Head off. I think my best lap was 3mins 14.502 secs. A long way to come but what a track, we really enjoyed ourselves,
Col & Jacqui

Offline turboguzzi

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Re: Building a CB500 classic racer
« Reply #283 on: April 27, 2010, 03:27:48 PM »
When you go home we stayed another night and i take the Head off. I think my best lap was 3mins 14.502 secs. A long way to come but what a track, we really enjoyed ourselves,
Col & Jacqui

hei col,

too much power man!  blowing a head gasket like that... :)

Using a 0.8mm cooper gasket, no problems ever in three seasons. touch wood...

3:15 sounds good to me! That's almost mid field in the open class bikers classic race

compliments

TG


Offline Yrjo#54

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Re: Building a CB500 classic racer
« Reply #284 on: April 27, 2010, 09:12:24 PM »
My best laptime in Qualify was 3:24.646 and in the race 3:17.849. 

Offline iomtt9

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Re: Building a CB500 classic racer
« Reply #285 on: May 02, 2010, 10:20:25 AM »
After taking head off at Spa, decided to strip whole engine down. removed motor and chucked the old spare motor in. Just putting it back together.  Race at East Fortune in 2 weeks, then back to Assen and Oostende !!!!
« Last Edit: May 02, 2010, 12:52:19 PM by iomtt9 »

Offline MRieck

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Re: Building a CB500 classic racer
« Reply #286 on: May 02, 2010, 04:08:25 PM »
When you go home we stayed another night and i take the Head off. I think my best lap was 3mins 14.502 secs. A long way to come but what a track, we really enjoyed ourselves,
Col & Jacqui

hei col,

too much power man!  blowing a head gasket like that... :)

Using a 0.8mm cooper gasket, no problems ever in three seasons. touch wood...

3:15 sounds good to me! That's almost mid field in the open class bikers classic race

compliments

TG


Yes...you need metal gaskets....base and head. No fiber.
Owner of the "Million Dollar CB"

Offline bwaller

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Re: Building a CB500 classic racer
« Reply #287 on: May 02, 2010, 04:18:28 PM »
Hey Colin is that a Yosh 6spd?

Offline fastbroshi

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Re: Building a CB500 classic racer
« Reply #288 on: May 02, 2010, 04:43:32 PM »
Speaking of metal gaskets, where are you guys getting those?  I assume you're getting them custom made.
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Offline turboguzzi

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Re: Building a CB500 classic racer
« Reply #289 on: May 02, 2010, 07:17:20 PM »
Hey Colin is that a Yosh 6spd?

that looks VERY close ratio  :)

Are you jealous brent?  ;)

Using a stock base gasket BTW,

TG

Offline Howell

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Re: Building a CB500 classic racer
« Reply #290 on: May 07, 2010, 12:16:14 PM »
After taking head off at Spa, decided to strip whole engine down. removed motor and chucked the old spare motor in. Just putting it back together.  Race at East Fortune in 2 weeks, then back to Assen and Oostende !!!!

Hi Colin,

I am back from a week on holliday in Germany with my wife.
I have to keep her satisfied because of many race weekends with my son.
Do you have the cilinderhead from Gerrit already ?
Are you gonna build the engine up with the Gerrit cilinderhead ?


gr.René
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Offline iomtt9

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Re: Building a CB500 classic racer
« Reply #291 on: May 07, 2010, 12:58:59 PM »
Rene, i think i am building another engine. When i get all the bits  i will take a pic and send it to you.
Col

Offline Luk_E29

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Re: Building a CB500 classic racer
« Reply #292 on: May 07, 2010, 04:41:21 PM »
Some tuning pics:

Pistons 57 mm (Honda Dax)
Inlet valve 29 mm (Renault 1400-1600cc 16V)






wow amazing stuff. This whole thread has blown me away. 
I am interested in the piston swap. If you don't mind me asking, Rene.  Did you use the stock cylinder block?
Would doing something like this for a bike NOT intended for racing be a bad idea?
thanks. and again really great stuff! good luck!

Offline iomtt9

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Re: Building a CB500 classic racer
« Reply #293 on: May 08, 2010, 04:08:49 AM »
Rene, just finishing putting 4 into 1 on for Assen ( will still take open meggas).
Will try it out at East Fortune next week.
Also bike is road legal as you can see by the plate so i'm off for a little test on it.
Brent sorry for the delay its a Nova 6 speed.
Col

Offline Howell

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Re: Building a CB500 classic racer
« Reply #294 on: May 08, 2010, 12:41:35 PM »
Some tuning pics:

Pistons 57 mm (Honda Dax)
Inlet valve 29 mm (Renault 1400-1600cc 16V)


wow amazing stuff. This whole thread has blown me away. 
I am interested in the piston swap. If you don't mind me asking, Rene.  Did you use the stock cylinder block?
Would doing something like this for a bike NOT intended for racing be a bad idea?
thanks. and again really great stuff! good luck!


Indeed we use the stock cylinder block.
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Offline Howell

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Re: Building a CB500 classic racer
« Reply #295 on: May 08, 2010, 12:52:32 PM »
Rene, just finishing putting 4 into 1 on for Assen ( will still take open meggas).
Will try it out at East Fortune next week.
Also bike is road legal as you can see by the plate so i'm off for a little test on it.
Brent sorry for the delay its a Nova 6 speed.
Col

Colin,

The awful noise you produced at Spa is not allowed at Assen as you know, max 102 dba ,so its a good decision to swap the exhaustpipes.
This afternoon I was at Gerrit , he told that he send the head thursday to you.
Our next race is sunday 16 may at Hengelo , we hope to finish again in the top ten.
See you at Assen Colin.
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Offline specweld

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Re: Building a CB500 classic racer
« Reply #296 on: May 09, 2010, 06:00:52 AM »
You've done a nice tidy job on fitting the exhaust Col,pity about the pigeon #$%* welding,did you put it on with a catapult ? ;D

Offline Howell

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Re: Building a CB500 classic racer
« Reply #297 on: May 17, 2010, 01:10:37 PM »
Third raceweekend : Murphy's law


This weekend we had a race on a road track.
Saterday - Warmup training , only one full lap and then in the second lap a crash caused by the clutchcable which came partly out of clutchlifter and therefore the clutch didn't work, so that at a speed of 100 miles in a fast corner , by changing from fifth to fourth gear the rearwheel blocked for a split second.
The bike came upright and Yrjo mist the corner complete and came with highspeed in a farmland, first without falling over a quarter of a mile.
But then a shallow ditch made an end on his farmland excursion and at a low speed then he was thrown off the bike.
He was lucky , he was not hurt only some pain in his left hand.
The bike had very little damage because the grass was high and wet, I could only find a bend footrest on the right side and the right clipon was pushed back and a lot off long grass and dirt all over the bike , even no scratches on the fairing.
After cleaning and putting back the clutchcable and adjusted it and repairing the footrest and push back the clipon the bike was ready for the first qualifying session.

Qualifying one.

Starting the bike I saw a oildrip came out from an oilhose at the oilfilteradaptor, I screwed on the nipple a little and the dripping stopped.
Yrjo had finished the first lap when I saw him in the distance and suddenly I saw a thick oil smoke coming from the bike.
He didn't notice that untill his foot rightfoot slided from the footrest and  also the marshalls showed the oilflag to late.
I thought the engine was blown up , the qualifying was stopped , because there was a lot of oil now on the track.
The cleaning of the track took 30 minutes.
When Yrjo and the bike were brought back to the pits , I saw that the oilhose was get off the nipple and that the oil was sprayed all over Yrjo and the bike.
He hadn't noticed it because the bike was still running good when it happened.
So no qualification time.
Now the hose had to be refitted and Yrjo and the bike had to be cleaned.
The cleaning was a hell of a job, everything was oiled up even the tyres.
We used a lot of degreaser and soapy water to clean the oilmess.
We were just ready before the second qualifying.
But we didn't reinstall the oilhose and removed the hoses , the filteradaptor and the oilcooler , this on advice from our tuner who was with us.
He adviced to install the stock oilfilter and oilfiltercase   , but we had no stock filter and case with us.
The tuner lives nearby the track and went home to get it.


Qualifying two.

Also this time just one lap finished. :'( :'( :'(
Hard braking on a very short hairpin the right clipon pushed forward against the fairing.
Yrjo pulled it back while riding , but to much so that the clipon came nearly to the tank and he couldn't make the next narrow corner to the pits and made a stop at the other side of the pitlane.
The marshalls stopped him to go to the pits , so qualifying two was over and out without a qualification time.
It was a disappointing day.
I think now that the crash was the cause that the oilhose came already partly off and that the oil was the cause that the clipon moved from its place because I saw afterwards there was some oil between the fork and the clamps.

Now the question was , do we have permission to start in the race.
Yrjo went to the race control , and it was no problem, but at the last position.

Sunday , raceday.

Yrjo's left hand was a little thicker then normal.
At 08:30 warmup training for five laps.
Everything went okay , no problems.
But this practice was to short to get the right feeling with the track.

The race:

Starting from the last position he passed before the first corner already five riders and I saw in the distance that Yrjo was quickly coming closer to the riders before him.
The bike is at topspeed very fast , so after the first lap he was on the fifteenth place , next round he was fourteenth fighting with a Ducati rider.
But he couldn't pass him , next round I saw that he shaked his head to me that there was a problem.
The rest of the race he was fihgting with the Ducati and he finished on thirteenth place behind the Ducati.
He had a problem shifting to fifth gear , he couldnt get the bike in fifth , so he rode half of the race with four gears.
The cause was that the left footrest hang loose and blocked the gearlever partly.
I think this was also the result of the crash.
This is a lesson for us , next time after  ac rash we must control the bike very precisely.
The crash had more impact on the bike as we first thought.
Our friend with the nr.5 finished fourth.

I end this story with a fotoimpression and now up for the next race at 30 may in Assen :
« Last Edit: May 17, 2010, 01:41:58 PM by Howell »
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Offline iomtt9

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Re: Building a CB500 classic racer
« Reply #298 on: May 17, 2010, 01:57:28 PM »
Hi Howell
 the main thing is Yrjo is safe and well !!! Well done for getting him out on the track,
but as you say, you need to give the bike a very good check after an off.
I had a bit better luck at East Fortune, i had 5 races 2 on Saturday and 3 Sunday.
Race 1 Saturday i was 3rd next race clutch burnt out
Sunday race 1 flat battery and the next 2 races i was 3rd place in them both,
so all went well and am looking forward to Assen in 2 weeks time, i will also be bringing another Rider
with a 500/4 with those awfull 4 open meggas on !!!!Then we stay in Holland and Belgium
and will see you again at Oostende..... My friend is called Dave Martin.
Col

Offline turboguzzi

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Re: Building a CB500 classic racer
« Reply #299 on: May 17, 2010, 02:16:06 PM »
Gee Howell, glad to hear the Yrjo is OK. Sounds like you learned a lesson in bike preparation now :).

Building a fast bike is one thing, making it stay together safely quite another.

for next race, our federation has required us to change all oil lines with pressure to braided with crimping at the ends, no hose clamps allowed. for a good reason.

I know that people here are very into oil coolers, but i have been running without one for more than three years now and have yet to see my oil degrading or any other problem of the sort in our 25 miuntes races.

dont remember who said it, Taglioni or Ferrari, but "what is not there doesnt break!"

TG