#6

[speedpro]

I've made changes to the riding position. Avalon commented it was like riding a couch with the seat and handlebar positioning. Because of that I've put the original FZR seat back on the bike rather than just sitting on the fibreglass tailpiece and placed the handlebars under the top triple clamp in the original position. Basically it's back to a stock FZR250 riding position. After riding the scooter all week it has a definite head down arse up feel to it. It was OK at the track today and I'm gonna give it a go tomorrow but my thoughts are that the handlebars are going back on top of the triple clamp. For some strange reason I was uncomfortable in the right onto the back straight, running clockwise, and tended to run wide. It also feels like I'd have less chance of saving it if something happened. My right wrist was letting me know about it as well as it's still unhappy after a big crash 30 odd years ago. It "looks" right so I'm thinking it's just me. My son has also commented that I sit upright more than others. could be that I know something others haven't figured out yet though that'd be a first.

[koba]

There is something odd with this thread, It tels me that speedpro made a post but I can't see it. Hopefully if I post here my post will become the most recent and it will stop telling me there is a new post that I can't read.

EDIT: and now I can see the last page, weird huh!

[F5 Dave]

Not really it was a stealth post.

I've noticed that my riding position on my 50 is quite uncomfortable whilst sitting on the dummy grid as I waited yesterday. Yet when riding the bike it is the best seat in the house. I like to be down low when cornering.

[jasonu]

Not really it was a stealth post.

I've noticed that my riding position on my 50 is quite uncomfortable whilst sitting on the dummy grid as I waited yesterday. Yet when riding the bike it is the best seat in the house. I like to be down low when cornering.

Complete opposite to Gossamers 'sit up and beg' position. I used to like the 'crouch' but I was younger (thinner) then...
Maybe a Harley or Goldwing framed bucket is in order???

[koba]

Not really it was a stealth post.

I've noticed that my riding position on my 50 is quite uncomfortable whilst sitting on the dummy grid as I waited yesterday. Yet when riding the bike it is the best seat in the house. I like to be down low when cornering.

More than one person I have spoken to about riding position has bought up your 50 as an example of getting it right. Thats without your 50 being the primary subject of the conversation too.

[speedpro]

The plans for bucket domination using a fleet of MB powered buckets is coming along. Currently in the garage are #6, an MB5, RS50 with H100 engine, MB100 engine lightly modified but getting worked on, MB100 engine over the top modifications, super modified MB100 for RS chassis, spare MB engine. There is a H100 away getting a water jacket on the head and barrell. All engines have 6 speed transmissions and I have fully modified clutch packs spare as well if needed. On the way are various good bits like an Ignitech ignition and generator system.

[koba]

The plans for bucket domination using a fleet of MB powered buckets is coming along. Currently in the garage are #6, an MB5, RS50 with H100 engine, MB100 engine lightly modified but getting worked on, MB100 engine over the top modifications, super modified MB100 for RS chassis, spare MB engine. There is a H100 away getting a water jacket on the head and barrell. All engines have 6 speed transmissions and I have fully modified clutch packs spare as well if needed. On the way are various good bits like an Ignitech ignition and generator system.

You have the sickness too...

Got any spare 6-speeds?

[koba]

The plans for bucket domination using a fleet of MB powered buckets is coming along. Currently in the garage are #6, an MB5, RS50 with H100 engine, MB100 engine lightly modified but getting worked on, MB100 engine over the top modifications, super modified MB100 for RS chassis, spare MB engine. There is a H100 away getting a water jacket on the head and barrell. All engines have 6 speed transmissions and I have fully modified clutch packs spare as well if needed. On the way are various good bits like an Ignitech ignition and generator system.

Love the Curtains.

You have the sickness too...

Double (ish) post due to intoxication and a silly fuggin mouse with a back button on it.

[speedpro]

You have the sickness too...

Got any spare 6-speeds?

I'm gonna build up a spare bottom end so not really. The only other 6-speed has a few scorched cogs so only good for spares.

If anyone is interested I can make up more modified clutch packs. At the moment I can do a same day exchange. My packs fit an extra pair of plates in but are the same assembled thickness and operate exactly like a standard clutch. There is no need to use spacers in with the clutch springs. They're good for about 25-27hp at the usual rpm. Not sure what torque they are good for.

[speedpro]

Thanks to Rob and the ESE guys I've managed to get a few runs on the RS50 with the H100 engine. This motor has untouched transfer ports, an only slightly enlarged piston port, a "bit" bigger and higher exhaust port. We tried a nearly fully worked RD350 reed valve and a stock RD350 reed valve. We tried my old 32mm Mikuni and a downdraught 28mm Mikuni. The squish clearance is bigger than desireable at .9mm but the combustion chamber is nicely shaped. It has my old ignition fitted.
With the 32mm carb and the flash carbon reed valve we adjusted the ignition and put a 260 main in the carb. That gave us a reasonable 19hp. Swapped to the 28mm carb. Initially it was way worse but a few main jets later it was more or less equalling the 32mm carb. Strangely it produced less midrange by about .5-1hp. We then swapped over to the unmodified RD350 reed valve with the steel petals. There was an obvious difference as soon as it was started with a different sound. The runs sounded way different, rougher. It made a lot less power everywhere. The modified reed block looks to have a lot less area than the stock one but it must flow better.
End result is a reasonable 19.?hp at about 11,000rpm so OK considering the tune.

[F5 Dave]

. . . Swapped to the 28mm carb. Initially it was way worse but a few main jets later it was more or less equalling the 32mm carb. Strangely it produced less midrange by about .5-1hp. . .

Yeah it's queer how that can happen. I've had a mismatched inlet with a step for a smaller carb & it has run better with the bigger carb all the way through the range. Not textbook stuff esp when you are looking for a kart track midrange carb to swap over to.

[Ivan]

I reckon I have a Troy Bayliss rding style its in between sitting right up and hanging down low due to my height,

The RS frames are such a nice riding position

[koba]

Thanks to Rob and the ESE guys I've managed to get a few runs on the RS50 with the H100 engine. This motor has untouched transfer ports, an only slightly enlarged piston port, a "bit" bigger and higher exhaust port. We tried a nearly fully worked RD350 reed valve and a stock RD350 reed valve. We tried my old 32mm Mikuni and a downdraught 28mm Mikuni. The squish clearance is bigger than desireable at .9mm but the combustion chamber is nicely shaped. It has my old ignition fitted.
With the 32mm carb and the flash carbon reed valve we adjusted the ignition and put a 260 main in the carb. That gave us a reasonable 19hp. Swapped to the 28mm carb. Initially it was way worse but a few main jets later it was more or less equalling the 32mm carb. Strangely it produced less midrange by about .5-1hp. We then swapped over to the unmodified RD350 reed valve with the steel petals. There was an obvious difference as soon as it was started with a different sound. The runs sounded way different, rougher. It made a lot less power everywhere. The modified reed block looks to have a lot less area than the stock one but it must flow better.
End result is a reasonable 19.?hp at about 11,000rpm so OK considering the tune.

What sort of pipe did it have? (I know I'm on the pipe buzz at the moment, not not that kind of pipe buzz...)

[speedpro]

It seems to be a copy of the pipe Wobbly designed for my "good" motor. Not too surprising considering everybody worked at BSL at some time. Which means it isn't even close to the right design for where this is motor is currently.

[koba]

It seems to be a copy of the pipe Wobbly designed for my "good" motor. Not too surprising considering everybody worked at BSL at some time. Which means it isn't even close to the right design for where this is motor is currently.

True. From a quick run down the road I'm liking the feel of the RG400 (or 500, I'm not sure) pipe I've just grafted on to my MB which is probably around the same state of tune now. (Although with MB porting rather than H).
All ports on mine are standard except a bit of work on the inlet, head is standard with too much clearance in the squish band but I'm very happy with it at this point.