ESE's works engine tuner

[husaberg]

Some very neat pics of the 87 Honda NSR500..........
Not sure what year they went to the carbs in front configuration but I guess it was around then.

[husaberg]

Some more

Last one looks later but still very Hondalicious

[F5 Dave]

Those barrels look damaged. I wouldn't buy those Husi. I don't think they are supposed to come apart like that.

[husaberg]

Those barrels look damaged. I wouldn't buy those Husi. I don't think they are supposed to come apart like that.

Fair enough

Here is a Yamaha to keep you quiet then.


plus this kitset version is on Trademe at the moment
http://www.trademe.co.nz/motors/moto...-774174269.htm

[Frits Overmars]

Allegedly 4JT-11311-30 TZ125 00-05 Not so sure myself unless it is a kit one I thought they ditched the PV?
But still looks very Honda Attachment 300516Attachment 300517Attachment 300518Attachment 300519Attachment 300520Attachment 300521

Maybe because it once was a Honda NSR500 cylinder

[peewee]

[husaberg]

Maybe because it once was a Honda NSR500 cylinder :whistle:

Yes hense the lol looks like a Honda, still not 100% sure it is NSR500 though, in the advert it did say NSR500 (but gave a TZ125 part number) i had never seen a Bartol cylinder but i suspect you and Wobbly have, and wondered if it was one of those?, I understand they were copied directly off a Honda.

[wobbly]

After years of humiliation by Honda power - Yamaha finally caved in and went long stroke and even used a T port for a while, but corporate pride was
involved I suspect and they never used the HRC dropping gate power valve to my knowledge.
A single blade in the centre and then finally their own bees knees and went back to the rotating spool, so a Yamaha with a dropping gate - dont think even Harold would
have got away with that.
I have exactly the same HRC cylinder cut up like that in a box here you can have for nothing.

[F5 Dave]

Fair enough

Here is a Yamaha to keep you quiet then.


plus this kitset version is on Trademe at the moment
http://www.trademe.co.nz/motors/moto...-774174269.htm

Hmm, wonder if you could fit a pair of CPI barrels on that? You know sacrilege & money no object kind of stuff

[richban]

So the bike has done plenty of hours now in various states of tune. After looking at the numbers again comp is sitting at 15.9:1.


Its time to update the cylinder head shape to the steeper bath tub profile. I can't see any sign of det anywhere. There is a ring in the squish band but that looks like its touching on some of the carbon build up on the piston. If anyone can see any major problems in the pics sing out.

Cheers Rich

[lodgernz]

VHM head Rich?

[husaberg]

After years of humiliation by Honda power - Yamaha finally caved in and went long stroke and even used a T port for a while, but corporate pride was
involved I suspect and they never used the HRC dropping gate power valve to my knowledge.
A single blade in the centre and then finally their own bees knees and went back to the rotating spool, so a Yamaha with a dropping gate - dont think even Harold would
have got away with that.
I have exactly the same HRC cylinder cut up like that in a box here you can have for nothing.

Yes Please..........
So do the numbers match the casting numbers in the pics?

[richban]

VHM head Rich?

VHM head with Custom insert. Care of Glen at Custom Components.

[Leed]

im not sure how everyone else did it but i did it this way. just with a paper clip to find the roof and floor angle then used a protractor tool to measure the paper clip. i may have a reed cage loaded into engmod from a old dirtbike but im not sure what good it would do you

Ive just measured a 90° angle on my desk with a paperclip
there is no way to get 90° because of spring back
do you have a source of specially annealed clips?
but your methology must be bend it to the angle you think it is and see if it fits the fit nicely?
- I like the idea but will use softer galvanised garden wire

[peewee]

to measure the roof you wont ever need to bend the clip to a full 90* because every transfer port roof ive even seen had atleast some upward angle. just bend the clip on the table corner then put it in the port and see how well it fits. bend it alittle more or use a new clip and bend alittle less, until it fits well then measure the angle. only takes a few minutes

for the floors just bend the clip to the full 90* on the table corner (or as close to 90* as you can), then set it on the table top and bend alittle more past 90*. its rather easy

perhaps theres a better simpler way to measure the port angles but the paper clip was always simple and easy for me

you may have good luck with wire or even solder.