facebook1   youtube1   twitter1   instagram   linkedin1   pinterest1

logosmallNOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community!

Upgrade for Powerdynamo (Vape) ignition

03 Dec 2020 00:36
Franjo
Premium Member
Premium Member
Posts: 83
More
Topic Author
Upgrade for Powerdynamo (Vape) ignition #1
Hi there!
I like the powerdynamo ignition which I bought in 2016 for my RT. Warm bike needs one kick, cold bike needs three and the 12V light is nice. But I was not very satisfied with the idle after the conversion. Too often the engine simply quit during idle. Especially when it was hot. Changing the pilot jet was also unsuccessful. Only raising idle to over 1600rpm made an improvement. But I didn’t like that and it started less good.
Some time ago here I read about a heavier alternative flywheel from Powerdynamo. But that is quiet expensive. So I decided to raise the weight of my lighter Powerdynamo flywheel to the weight of the origin Yamaha flywheel.
From a part of a huge steel tube and with a little help of my lathe I fabricated a steel ring which snugged over the Powerdynamo flywheel. I secured it with JB Weld. Now I’ve three seasons with it. The idle now runs with 1400 rpm.
Unfortunately I’ve forgotten the weight different between the Powerdynamo and the Yamaha Flywheel. But I think it was about 400grams (14oz).

With regards
Franjo

Searching a Kawasaki H2 Triple (1972-1975). Title is necessary for export to Germany!

This message has attachments images.
Please log in or register to see it.

The following user(s) Liked this Post 2fishkev, RT325, KJB, JayB, Gr8uncleal

Please Log in or Create an account to join the conversation.

03 Dec 2020 01:39
Gr8uncleal
Site Supporter
Site Supporter
Posts: 2553
More
Upgrade for Powerdynamo (Vape) ignition #2
Very ingenious, and with a long term test to back it up. :likey

Have you given feedback to the manufacturer?

Please Log in or Create an account to join the conversation.

03 Dec 2020 02:10
RT325
Platinum Member
Platinum Member
Posts: 5584
More
Upgrade for Powerdynamo (Vape) ignition #3
Good idea. I also have a brass overlay one on one of mine & makes a nice lazy but still powerful motor. Mine is extra weight on top of an original 360 flywheel.

Please Log in or Create an account to join the conversation.

03 Dec 2020 05:56
JayB
Site Supporter
Site Supporter
Posts: 249
More
Upgrade for Powerdynamo (Vape) ignition #4
One thing to know is that the 'moment of inertia' is proportional to mass times the distance to center squared. So while the weight you added to the new flywheel totals the same mass as the original, the added weight is farther from the center than the stock flywheel. So you are probably getting more flywheel effect than stock, even though the weight is the same.

But what is important is that you are happy from a seat of the pants perspective and you solved the idle problem! Good job, thanks for sharing! I may copy you if I have the same idle problem, which is the most sincere form of flattery!
The following user(s) Liked this Post Midlife Motor

Please Log in or Create an account to join the conversation.

03 Dec 2020 17:37
mdscott
Site Supporter
Site Supporter
Posts: 2975
More
Upgrade for Powerdynamo (Vape) ignition #5

Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR80R
The following user(s) Liked this Post Franjo

Please Log in or Create an account to join the conversation.

03 Dec 2020 17:56
MarkT
Site Supporter
Site Supporter
Posts: 9141
More
Upgrade for Powerdynamo (Vape) ignition #6
Good point on the Moment of Inertia but pretty sure Powerdynamo flywheel is smaller OD than stock flywheel as well as being lighter.

When I was working with the original Powerdynamo, they had several flywheels and weights that all worked with the same stator... At least 3 different ones. One of them is about 4 pounds. I tested the two lighter ones for the 175's.

The way it worked was they would make up the kit with the dimensions and such that a customer requested... including flywheel weight. Any of the flywheel weights could be machined to fit the crank and the same stator was used for all. The very lightest flywheel had smaller magnets so less lighting wattage and had a different CDI box to match the smaller magnets. (Different size capacitor was used in the CDI box) The medium and heavy flywheels had same light output and CDI box.

I don't know about now that VAPE has taken over but when Edgar owned the company you could ask for any of the (at least) three flywheel weights that were available. I'm pretty sure the 360 has a medium weight and there is a heavier one you might be able to order.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Please Log in or Create an account to join the conversation.

03 Dec 2020 18:07 03 Dec 2020 18:10 by mdscott.
mdscott
Site Supporter
Site Supporter
Posts: 2975
More
Upgrade for Powerdynamo (Vape) ignition #7
Flywheel DT.

When I bought the vape for my Bultaco there were two flywheels available.


Thanks Mark
Roseville, Ca.

'06 GL1800
'98 KDX220
'75 Norton
'73 CB500K
'01 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR80R

This message has attachments images.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

05 Dec 2020 01:55
Franjo
Premium Member
Premium Member
Posts: 83
More
Topic Author
Upgrade for Powerdynamo (Vape) ignition #8
In the past I bought about 7 or 8 of these ignitions (72 38 799 DC) from Edgar. He told me that I can also use the heavier version (73 45 799 00) of 1,9kg which they offered for the TY250. But this version was about 100$ more expensive. The 72 38 799 AC was made for alternative current and use without battery.
Also had one for a Kawasaki 500 H1 from them and for several Yamaha XT's. The flywheel for the Kawa looks pretty much like the ones we use on the DT/RT's. But the cones naturally are machined different. I think they don't make so many different flywheels there. Only make the cones different.
I attach the photo from the old Powerdynamo page which was taken over from Vape after Edgars disease:
www.powerdynamo.biz/deu/systems/lists/yamaha.php
But to be honest ... they were always produced by Vape in Czechia. And Powerdynamo was their best Distributor settled in Germany.

Searching a Kawasaki H2 Triple (1972-1975). Title is necessary for export to Germany!

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

Moderators: yamadminEnduronutMakotosunDEETVinnieDevinJames Hart
G-Y97Q3KKWBV