ESE's works engine tuner

[jasonu]

Here’s one for you rule interpreting guys.

Taking the NZ Bucket rules, where it states “Engines must be derived from non-competition motorcycles,” could someone:

a. Extreme ask. Melt down a non competition cylinder, eg a H100 or Suzuki A100 and cast an entirely new design cylinder with that molten material?
b. Less than extreme ask. Completely remove the guts of an appropriate cylinder, probably water cooled, and refit an entirely new internal port set and cylinder arrangement, the external sort of resembling the original?
c. Mild ask. Remove the CI liner and then fit a plated aluminium liner?

A- Yes.You could melt down one if Mic Doohan's cylinders and make your own if you wanted to.
B- Yes as long as the original cylinder is non competition
C- Yes as long as the original cylinder is non competition.

[senso]

Here’s one for you rule interpreting guys.

Taking the NZ Bucket rules, where it states “Engines must be derived from non-competition motorcycles,” could someone:

a. Extreme ask. Melt down a non competition cylinder, eg a H100 or Suzuki A100 and cast an entirely new design cylinder with that molten material?
b. Less than extreme ask. Completely remove the guts of an appropriate cylinder, probably water cooled, and refit an entirely new internal port set and cylinder arrangement, the external sort of resembling the original?
c. Mild ask. Remove the CI liner and then fit a plated aluminium liner?

The cylinder must be from the same model/brand of the engine that it is bolted on?
Is there an age limit for the cylinder?

Do what a lot of people on Portugal do, grab an Rotax cylinder(from an Aprilia RS 125, road legal, so its okey), the thing is that you guys also have capacity limits, but over here there are lots(more than 10) yamaha dt lc 50 base engines with rotax 122 and rotax 123 cylinders, there is at least one that has the 160cc Polini kit for the rotax engine, there is one vespa 50s getting one(but that one is based in some quatrini crankcases, but none the less, its just a mather of time before someone slaps a rotax cylinder in some old original vespa 50s crankcases).

[Grumph]

Here’s one for you rule interpreting guys.

Taking the NZ Bucket rules, where it states “Engines must be derived from non-competition motorcycles,” could someone:

a. Extreme ask. Melt down a non competition cylinder, eg a H100 or Suzuki A100 and cast an entirely new design cylinder with that molten material?
b. Less than extreme ask. Completely remove the guts of an appropriate cylinder, probably water cooled, and refit an entirely new internal port set and cylinder arrangement, the external sort of resembling the original?
c. Mild ask. Remove the CI liner and then fit a plated aluminium liner?

Ken - over the years plenty of cylinders have been cast for buckets in NZ, mostly water cooled. On a set of cases originating as a road bike , no problems legally. Personally, i've never seen a motor with home made cases and road based cylinder but this would equally satisfy the "non competition" requirement.
Both cylinder and cases home made....well even with a road crank, dubious at best.
One rule that is conspicuous by it's absence here is the aussie requirement for road frames too, hence the use of early RS frames as they went through a period of being cheap and available...

[Flettner]

Anything is legal, so long as you don't get caught

Actually the rule was ( is? ) so long as you make it yourself it's within the rules, cases, cranks, gearboxes, cylinders etc.

[F5 Dave]

Its all just a jolly shame that the Japanese et all didn't continue with the 70s trend of making 100cc versions of the 125s & the cry for cheap commuter bikes kept them pouring into the country so we were left with lots of NSR/TZR/RGV/Mito 100s to play with.

[peewee]

hey guys does anyone have info on these carbs ? like a model number/name or what bikes they might of been standard equipment on so ill know where to search. they look perfect for a project i have but couldnt find anything that looked like them from a google search. it appears to say mikuni on the side but other than that im stumped

[F5 Dave]

Plain old RGV (or RS250 Aprillia). Come in a few sizes 26, 32, 34 in same body. Can be bored to 35ish. Some models have solenoids for emissions.

[peewee]

mikuni RGV is the model name ? im asking because ill look through ebay and such but without a model name i may not get very far

[F5 Dave]

Suzuki RGV250 was bike fitted to (as Aprilia RS250 uses the RGV engine).

[peewee]

thnx mate i found some. so if they all use the same body/slides/floatbowl etc, then the only difference is the larger ones were bored at the mukini factory ? if thats the case then couldnt the 26 be bored to 35 since the body would be the same or am i missing something ?

[2T Institute]

There is no 28mm RGV mikuni only 32/34mm which is the same body, the 28mm is from a TZR 250 and isn't the same type of carb. DT 200 also uses a 28mm, the 30mm off a WR200 is very rare.

[peewee]

ok from my little bit of research just now, it appears most or maybe all the rgv250 used the mikuni TM34S carb, which i assume is a 34mm. for what ever reason the parts fishe shows some bike models had a flex tube idle screw on both carbs and some only had the flex tube screw on one carb with the other carb using a standard screw and jam nut. perhaps the carbs are the same other than the idle screw assembly, far as i can tell anyways. i think a pair of these carbs should work just dandy

[peewee]

hmm i found this spec sheet. maybe the early bikes had 34mm carb and everything after '92 has 32mm. http://www.motorcyclespecs.co.za/bikes/Suzuki%203.htm

[F5 Dave]

The earlier vj21 had 32 and the vj22 had 34 although jap home models differed.

A mate has a vj23 (96) but can't quite remember what carbs it has

[F5 Dave]

There is no 28mm RGV mikuni only 32/34mm which is the same body, the 28mm is from a TZR 250 and isn't the same type of carb. DT 200 also uses a 28mm, the 30mm off a WR200 is very rare.

Ahh ok but the RG150 runs that body effectively an RGV 125 but not quite. Has a crazy offset 26mm. In same body as 34. No one in street stock class ever fitted one. Much.

I've bored a 32 to 35 from both sides and a dremel tickle in middle. Plus shorten the lid to get the travel.


KR250 tandem has smaller 28s like TZR but without pj.