Search found 295 matches

by Lars
Mon Jun 29, 2020 2:54 pm
Forum: Technical: Questions and Solutions
Topic: Adjust ignition - electric start
Replies: 2
Views: 102

Re: Adjust ignition - electric start

Hi Martin
I have no experience with Dyna Start systems, but I can not see how it would make any difference to the timing of the ignition. So, if the points just start to open at around 2 mm BTDC, that should be fine. Aiming for about 0.3 mm gap when fully opened should also be fine. / Lars
by Lars
Mon Jun 29, 2020 2:51 pm
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

No problem, Martin. Any time. / Lars
by Lars
Tue Jun 23, 2020 7:51 am
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

Hi again Ren, I should just add that the flexible hose I mentioned is taken from a standard compression test kit. The type of compression tester with different hoses for different spark plug threads. I then made up the connection from that hose connector to the pressure/vacuum tester. Other users ha...
by Lars
Tue Jun 23, 2020 7:27 am
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

Hi Ren,
No, in the spark plug hole. The flexible hose in the kit has a spark plug thread in one end, and connection the the manometer in the other. Keep the piston at the bottom when you test, so that the transfer ports are open.
Best,
Lars
by Lars
Fri May 29, 2020 5:50 pm
Forum: Technical: Questions and Solutions
Topic: Insert battery
Replies: 8
Views: 397

Re: Insert battery

I agree that the power is limited and, with the headlight always on, there is not much power left to do any damage. Well, good to know that you made it work the simple way. Elie, or anyone else interested, here is the modification we are talking about: One end of the lighting coil winding is normall...
by Lars
Fri May 29, 2020 12:39 pm
Forum: Technical: Questions and Solutions
Topic: Insert battery
Replies: 8
Views: 397

Re: Insert battery

I did say only half-wave rectification "unless you modify the coil", and by that I meant to undo the ground side of the coil and bring out a separate wire to get the coil floating to ground. Which is what you did and described. Good to know that it can be done without too much difficulties, and that...
by Lars
Fri May 29, 2020 7:15 am
Forum: Technical: Questions and Solutions
Topic: Insert battery
Replies: 8
Views: 397

Re: Insert battery

I am working on the electric of the Rumi, about this some questions. Is the voltage supplied by the motor ac or dc?, if i want to insert a battery then I need to put a rectifier to power the battery if voltage is ac? What voltage does the motor in volt and amp?, does any of the members have a drawi...
by Lars
Sat May 23, 2020 4:50 pm
Forum: Technical: Questions and Solutions
Topic: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)
Replies: 37
Views: 1492

Re: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)

Hi again, Hugo. This tool looks nice for about 22 Euros. 10 mm too tight for the Rumi flywheel, though. Should be possible to modify, or find a larger version. https://www.rinab.nu/moped-klass-2-a/Honda/MB-50/Verktyg/Mothaall-svaenghjul.htm?sClickID=GoogleShopping-31&gclid=EAIaIQobChMIld2xtqfK6QIVQq...
by Lars
Sat May 23, 2020 4:28 pm
Forum: Technical: Questions and Solutions
Topic: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)
Replies: 37
Views: 1492

Re: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)

I understood what you meant, Hugo. You were talking about the key for the shaft. But that does not change my dislike for the castle nut, requiring a special tool (which I do not have!) and split pin - for no good reason. Only my opinion, too. I am just glad my Junior engine has the better solution,...
by Lars
Sat May 23, 2020 8:31 am
Forum: Technical: Questions and Solutions
Topic: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)
Replies: 37
Views: 1492

Re: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)

I understood what you meant, Hugo. You were talking about the key for the shaft. But that does not change my dislike for the castle nut, requiring a special tool (which I do not have!) and split pin - for no good reason. Only my opinion, too. I am just glad my Junior engine has the better solution, ...
by Lars
Fri May 22, 2020 2:21 pm
Forum: Technical: Questions and Solutions
Topic: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)
Replies: 37
Views: 1492

Re: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)

always good when you find the definite cause to a problem :wink: . reading this reminds me to ask - I do not like the idea of the split pin on the flywheel nut, if you cannot reach the position to match the slots in the nut with the hole in the crankshaft without overtightening it requires you to b...
by Lars
Thu May 21, 2020 8:38 am
Forum: Technical: Questions and Solutions
Topic: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)
Replies: 37
Views: 1492

Re: Engine doesn't sound as it should ... (BIG SURPRISE INSIDE)

What a surprise. You have had a Rumi with elctronic CDI ignition all along, without knowing it! I would never try to start an engine if I heard and felt the piston hitting. Find out where it hits and do whatever it takes to get the necessary clearance first. The cracking or sizzling sound you hear f...
by Lars
Wed May 20, 2020 2:16 pm
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Sorry, you beat me to it. Glad it worked out!
by Lars
Wed May 20, 2020 2:15 pm
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Yes, that should be correct. From the photos of older, rusty example of the switch which you opened up, it does look like no. 4 is indeed the horn switch. I would verify with the ohmmeter by pushing the horn button. No. 4 should then read 0 ohms to ground (housing and bracket). But it looks right, s...
by Lars
Wed May 20, 2020 12:40 pm
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Sounds good and makes sense.
by Lars
Wed May 20, 2020 11:28 am
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Yes, from what I can see, it does make sense. But what a mess... The loose black wire seems to be the ground connection for the lamp/reflector assembly. Since the reflector is on a swivel mount, it does not get good ground connection through the metal, so it needs a separate wire ground. Assuming th...
by Lars
Wed May 20, 2020 8:08 am
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Good morning Hugo, The Kill button? Now you really have me confused. It should have nothing to do with the lights. The Kill switch only connects the two primaries (usually green and white) on the ignition coils together. I agree that the color should remain the same even after it passes a component ...
by Lars
Wed May 20, 2020 7:47 am
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

Some of us do. I certainly do. A pressure test is the first thing I would do if I saw the symptoms you describe. If the leak is bad enough, you don't even need a pump and a gauge. You just blow into the engine (with intake and exhaust blocked off), and you will hear and feel the air whistling out of...
by Lars
Wed May 20, 2020 7:42 am
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Only two, because there are three that you know, 25/25 headlamp you know, and horn you know too... +ve i know it`s 3a and tail lamp it`s 5. Regards Thank you Claudio :D So in the new CEV switch will be: 1 Low light 2 High light 3a +ve 4 Horn 5 Tail light The question now is about the wires and the ...
by Lars
Tue May 19, 2020 6:32 am
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Hugo, I think Claudio was saying that you need the seven wires If you want all the original functions, including the pilot lights. Certainly you could mount the CEV switch and use only five wires to get the same functions you have now. To do that, just concentrate on the pos. 2 on the right in David...
by Lars
Mon May 18, 2020 8:43 pm
Forum: Technical: Questions and Solutions
Topic: Replacing CEV switch
Replies: 35
Views: 1408

Re: Replacing CEV switch

Hugo, I agre with Claudio: Take the ohmmeter and check which terminals are connected together in the different positions. Then use common sense to label the terminals. That way, you will understand what you are doing. You are already well on your way. Moving wires around by trial and error on an idl...
by Lars
Sat May 16, 2020 1:26 pm
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

Hi, But if the spark plugs are dry, doesn't mean that the fuel do not reach the cylinders?, otherwise they would get wet after failing the attempt to start the engine. Hi Hugo, Yes,of course. But what I meant was that Martin should try some more to get the fuel into the cylinders. Flooding the carb...
by Lars
Sat May 16, 2020 7:36 am
Forum: Technical: Questions and Solutions
Topic: Torque nut
Replies: 2
Views: 386

Re: Torque nut

Have 2 more questions. Is there a torque for the nut on the rubbers at the back of the scooter, and someone has a clear drawing of the electrics in the headlight, it is about how to stop the engine, Elie, about the electrics: The wiring diagram is available in the download section on this forum. Yo...
by Lars
Sat May 16, 2020 7:12 am
Forum: Technical: Questions and Solutions
Topic: Dry sparkplugs
Replies: 24
Views: 1004

Re: Dry sparkplugs

Hej Martin, I don't think the pistons are turned the wrong way. That mistake is almost impossible to do. The Rumi pistons have a tall ridge on top, which fits into a cavity in the cylinder head. Turned the wrong way, the pistons would hit, and the engine would not even turn over. I tend to agree wit...
by Lars
Wed Apr 15, 2020 6:13 am
Forum: Technical: Questions and Solutions
Topic: engine removal
Replies: 13
Views: 2913

Re: engine removal

Thanks UHJ200, Just removed the engine, " Stay Strong" makes sense! I have both surface plates and dial indicator. In as much as the air " escaping" through the vent hole on top of the transmission when tested through the left air intake port, it would appear to me that the loss may be through the ...
by Lars
Tue Jan 07, 2020 10:54 am
Forum: Cafe Rumi
Topic: Bol D'Or - New Project
Replies: 449
Views: 251188

Re: Bol D'Or - New Project

Came to think about it, Ren, it might be a good idea to start a new thread about your Bol D'Or in order to discuss this matter further. We have some very experienced Rumi restorers on this forum, so you may be able to find some helpful hints. But I know that Hugo likes to keep the different subjects...