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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
Warning to those port matching intakes
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. My 50 mile ride turned into a Epic Fail today. Half way there I was kicked in the nuts hard.......  | | 
02-02-2009, 09:30 PM
|  | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Concord NC
Posts: 221
| |  Warning to those port matching intakes
My 50 mile ride turned into a Epic Fail today. Half way there I was kicked in the nuts hard....bad part was I left the spare at home... 
How many of you has this happened to? Looks like the result of thinning the metal out, heat and high vibration. I need a bracket to hold the intake/carb stable. Im gonna figure out how I can rig something to brace them off and keep the vibrations down. It should also control the foaming of the fuel in the float bowl some. |
02-02-2009, 10:03 PM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2008 Location: Bellingham, WA
Posts: 536
| | Re: Warning to those port matching intakes
I would get one of the steel ones. The diameter of the tube is larger and they are much stronger even after matching the intake port. |
02-02-2009, 11:08 PM
| | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Concord NC
Posts: 221
| | Re: Warning to those port matching intakes
Quote:
Originally Posted by Ghost0  I would get one of the steel ones. The diameter of the tube is larger and they are much stronger even after matching the intake port. | Ive been looking for one but cant find a supplier....Ive got my spare on and even made a weak attempt at bracing the carb a little but i dont think its gonna help.  
Maybe itll help, but probally wont. Im gonna keep trying different things though. Im thinking change the bend where i can drill a hole and run the float bowl bolt through it to.
Last edited by ibcnya : 02-02-2009 at 11:22 PM.
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02-03-2009, 08:17 AM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: Warning to those port matching intakes
A stiffer bracket may help. Is your spare ground on as well?
The regular engine suppliers should have the steels ones, no 
I used to think the cast pups were the HiPo units....until I found out they are actually smaller ID. Now I guess here's another reason.... |
02-03-2009, 11:08 AM
|  | Godfather of Motorized Bicycles | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 7,127
| | Re: Warning to those port matching intakes
Interesting, never seen it happen.
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If it ain't broke, and you mess with it long enough, it will be. |
02-03-2009, 11:12 AM
|  | Motorized Bicycle Elite Member | | Join Date: May 2008 Location: Fountain Hills, Arizona
Posts: 890
| | Re: Warning to those port matching intakes
thatsdax sells steel intakes |
02-03-2009, 11:26 AM
| | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Concord NC
Posts: 221
| | Re: Warning to those port matching intakes
Quote:
Originally Posted by justbill thatsdax sells steel intakes | Hes not listing them... |
02-03-2009, 11:50 AM
|  | Motorized Bicycle Elite Member | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,597
| | Re: Warning to those port matching intakes
I was trying to decide whether to port the aluminum intake, or the chromed steel. I noticed the steel seems bigger, and I figured it would hold up better. If you're going to port the aluminum version, it might be a good idea to have the outside of it welded up to add some extra material to compensate for what you're taking out.
Sorry to hear that happened on a ride.
Honestly I'm not sure how much a bracket is going to help. I think if you thin the material out too much, it will fail no matter what. |
02-03-2009, 12:24 PM
| | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Concord NC
Posts: 221
| | Re: Warning to those port matching intakes
Quote:
Originally Posted by jasonh I was trying to decide whether to port the aluminum intake, or the chromed steel. I noticed the steel seems bigger, and I figured it would hold up better. If you're going to port the aluminum version, it might be a good idea to have the outside of it welded up to add some extra material to compensate for what you're taking out.
Sorry to hear that happened on a ride.
Honestly I'm not sure how much a bracket is going to help. I think if you thin the material out too much, it will fail no matter what. | The new intake wasnt ported, I just put it on. It was a spare i had. To bad I didnt have it with me on my ride, but ill wait till I find a better chrome one before attemting to port again. |
02-03-2009, 12:41 PM
| | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Concord NC
Posts: 221
| | Re: Warning to those port matching intakes
Quote:
Originally Posted by Pablo A stiffer bracket may help. Is your spare ground on as well?
The regular engine suppliers should have the steels ones, no
I used to think the cast pups were the HiPo units....until I found out they are actually smaller ID. Now I guess here's another reason.... | No my spare is completely normal aluminum cast. I pieced the broken one back together so you guys can see the extent of my porting. The only thing i can think of is a crack began at the top and worked its way around the seam...  | | Thread Tools | | | | Display Modes |  Linear Mode | 
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