Search found 1501 matches

by Lasse
Sun Sep 28, 2014 5:11 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hm, you say you could buy another engine! But how could you know if this almost 70 year old motor would be any better? And think about the crazy RUMI prizes asked to day... Go out now, and try your own engine - and save LOTS of Money! After all, all your struggles with your own motor, has made you ...
by Lasse
Sun Sep 28, 2014 12:21 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hey Again, Hugo! You wouldnt spoil anything, by just trying to tighten all bolts gradually (after applying some gasket compound, to seal off the gearbox oil) Then you could testdrive the bike (the season isnt completely off yet) - and get further MOTIVATION - either to enjoy the bike "as is" - becau...
by Lasse
Fri Sep 26, 2014 5:06 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hello, Hugo - I just took a look on the Locktite page - and it looks like its a proper product to use. Just one Word of warning: Will this product cure to STONE HARD? Because IF it cures to a "metal like" substance, it MIGHT in time become "brittle" or "flaky" - and thats not good. Not to overly pro...
by Lasse
Thu Sep 25, 2014 2:20 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Again, and not to offend Lars, this product would be ideal to fix the problem in question! If I would use it, I would go as follows: First, I would make a "curing test" . just to etablish, how many minutes it would take to "half-cure" (to transform partly to firm synthetic rubber) Why this? Because,...
by Lasse
Wed Sep 24, 2014 8:34 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

I might offend someone? - but those very small differencies - 0.3 mm on the outside of a ball race, isnt something to be scared about. Remember, this is a motor, giving very Little power, and I can guarantee, the synthetic rubber will hold the race in question in a grip so firm, that the motor dont ...
by Lasse
Wed Sep 24, 2014 1:52 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Its heat resistant up to several hundred degrees Celsius! Normally, in a RUMI crankcase/gearbox - the temperature (hopefully) never exceeds 100 degrees celsius... Remember, inside the crankcase, there should be temporarely quite cool, because of the fresh gas inhaled through the carbs, going to the ...
by Lasse
Tue Sep 23, 2014 9:57 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hugo, do not despair - because you have two halves, fitting very well togetyher, as you explain. Only "snag" is the bearings, beeing a Little "too small"! BUT, in the leisure boat industry, there is a product, a kind of synthetic rubber, which I think could solve your problem completely What is it? ...
by Lasse
Sat Sep 20, 2014 3:55 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Looks great - & thank you for your feed back!
And Hugo, if you REALLY would like the cylinders to look 100% the same, and look like aluminium - you could simply get both cylinders vapor blasted - dont cost very much, and leaves the surfaces elegantly matte...
by Lasse
Fri Sep 19, 2014 4:27 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Oh, forgot to mention a more radical way, if you want a 100% uniform look of your cylinders. Take them to a wet-glass blaster - and let the Company give the cylinders a LIGHT blast! And, very important, use a sturdy cardboard tube to fix inside the cylinders, so no harm can be done to the delicate c...
by Lasse
Fri Sep 19, 2014 4:23 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hello Hugo - you need the socket drive, not to PULL the pins out, but to gently hammer them out , using a plastic hammer... About the ParmaKit cylinders, you wrote something about fingerprints on the PAINT! To my best knowledge, those cylinders are cast of aluminium - and never painted... The socall...
by Lasse
Thu Sep 18, 2014 9:14 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hi Hugo - I am afraid you misunderstood me? The socalled Seeger rings are sitting at each side of the piston, in "spurs" - and their jobs are simply to avoid the piston pin to move outwards (or move from side to side) - thereby to contact the cylinder wall, and scratch this. We have two types of pis...
by Lasse
Wed Sep 17, 2014 10:13 pm
Forum: Classified - Wanted & Sale
Topic: Someone fancy a MOTOBI racer?
Replies: 0
Views: 1884

Someone fancy a MOTOBI racer?

If you want a superb MOTOBI twin cyl. twin carb two-stroke - then take a look at "lasses MOTOBI racer" - rebuilds brought here in Forum, a couple of years ago.
I am selling, to finance another project - so interested?
Just drop me a mail.
by Lasse
Wed Sep 17, 2014 10:06 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hello Hugo - first of all, do tape the pistonrings with some wide tape... Why that? Because when you start to handle the pistons, you could easily break a ring - not really an option. Then you have to remove the socalled "Seeger rings" - one at each side of the piston, protecting the cylinder walls...
by Lasse
Mon Sep 15, 2014 2:45 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hugo, the coverage of sealant is about right, and NOT too much - this will do fine! To be honest, I used considerably more when rebuilding my RUMI motors... And to my best knowledge, those motors have been running OK since then. (Have you, by the way, heard anything from the Gentlemen, who bought m...
by Lasse
Sun Sep 14, 2014 9:43 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Yes, I am still alive... Hugo, you are doing a stunningly superb job, with unheard about patience - and I am sure you will prevail! BUT - I hope you will think about the tiny hole, or tunnel, leading gearbox oil to the roller bearing at the leftside (flywheel side) of the motor? Dont block that with...
by Lasse
Sat Jul 26, 2014 11:03 am
Forum: Other Motorcycle Brands
Topic: "Barn-find" - one of just two 1000cc kneeler racers
Replies: 3
Views: 4543

Re: "Barn-find" - one of just two 1000cc kneeler racers

Too early out with this project, unfortunately.
I just missed it - because of "Money problems" - sad...
by Lasse
Thu Jul 24, 2014 5:33 pm
Forum: Other Motorcycle Brands
Topic: "Barn-find" - one of just two 1000cc kneeler racers
Replies: 3
Views: 4543

"Barn-find" - one of just two 1000cc kneeler racers

Not really a RUMI, but anyway, quite interesting... I found a very, very strange 1000cc trackracer, heavily rebuilt with many weird & wonderful parts. The "Heart" of the vehicle is from "Ariel Square four" one 1952 two pipe motor, and another, rebuilt, four pipe motor, with matching numbers! Huge i...
by Lasse
Sat Jul 19, 2014 5:13 pm
Forum: Technical: Questions and Solutions
Topic: lack of power
Replies: 58
Views: 35283

Re: lack of power

On the contrary...
by Lasse
Tue Apr 08, 2014 3:46 pm
Forum: New member, welcome here!
Topic: Hello all......anybody want a Junior Gentleman?!
Replies: 2
Views: 4271

Re: Hello all......anybody want a Junior Gentleman?!

One can think - why Pictures never shoved up...
by Lasse
Sat Mar 22, 2014 9:42 am
Forum: Technical: Questions and Solutions
Topic: Struggling with the Fourth Gear Method
Replies: 23
Views: 19107

Re: Struggling with the Fourth Gear Method

You look very happy & confident! After your struggle with the gearbox, please tell us if it really Works perfectly now? Also, how does the motor run? What about the jetting and firing point(s)? Could be very interesting if you would post a "drivers report" covering the "mechanicals" - together with...
by Lasse
Sat Mar 22, 2014 9:35 am
Forum: Other Motorcycle Brands
Topic: 4 cyl. 1954 overhead cam motorcycle motor!
Replies: 78
Views: 51215

SPRING!

Spring came early in Denmark - so, naturally I had to treat my NIMBUS to some fresh sea brize...
(Its now I miss my two RUMIs - but realistically, they were admittedly too small for my bulk)
by Lasse
Sat Mar 08, 2014 4:21 pm
Forum: Other Motorcycle Brands
Topic: 4 cyl. 1954 overhead cam motorcycle motor!
Replies: 78
Views: 51215

Re: 4 cyl. 1954 overhead cam motorcycle motor!

Hm - one Picture was too large...
by Lasse
Sat Mar 08, 2014 4:14 pm
Forum: Other Motorcycle Brands
Topic: 4 cyl. 1954 overhead cam motorcycle motor!
Replies: 78
Views: 51215

Re: 4 cyl. 1954 overhead cam motorcycle motor!

Long time no see... My NIMBUS is very much alive, and I have joined parties, to go alternatively (first) to Sweden - then a longer trip to The Harz "Mountains" in Germany. To be able to survive 8 to 10 days (clean underwear & such Things) I have made up a "luggage platform" - to hold quite much "st...
by Lasse
Wed Feb 12, 2014 5:36 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

Hello Hugo - Im still here...
You are very good served from Rudolf, I must say - the carburetor repair looks perfect!

About the (too long) rear-spring:
Take your angle grinder, and cut the spring down to the correct lenght - job done...
by Lasse
Sat Jan 25, 2014 6:17 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

OK Hugo, so you are going to use heat... Then I would strongly recommend you to heat two Squares, namely 1 & 2 B, maybe focusing mostly on Square 1 b. How hot should the metal be before applying force? It will be easy for you to see when the part is ready to be corrected - because the part simply m...
by Lasse
Sat Jan 18, 2014 4:26 pm
Forum: Cafe Rumi
Topic: My "new" old Bicarburatore
Replies: 1802
Views: 1091261

Re: My "new" old Bicarburatore

HOLA Hugo - nice to see you are active! Just a Word of warning (I guess you should know already?) The lower part of the "leg" - isnt it cast-iron? Or cast of some metal?? Are you sure you want to heat it... Why not try carefully, slowly to use the bottle Jack, just to see if you can move the thing....