450 drops revs and stalls - Honda Rebel Forum
 
Thread Tools Display Modes
post #1 of 7 Old 08-09-2019, 03:30 PM Thread Starter
 
Join Date: Jul 2016
Posts: 23
Garage
450 drops revs and stalls

Got a strange problem with my Rebel.
Driving home,after getting to higher speeds the power started droping. Revs fluently felt down till non. Shifting to lower gear did not make revs any higher. Throttle handle wasn't responding at all. After stopping at the road side, the engine stalled and did not start. After fer minutes waiting and trying to start the bike it worked, and drived as nothing happened. On lower gears it was reving fine, but after a while the same happened. Had to stop, wait for 5-10 minutes and start again.
In 4 miles, stopped 4 times.
When stalling starts, it seams that it starts working as t has no fuel, or its only one cilinder. The fuel seems visible in tank. No leaks, or hose brakes visible


Last weekend i went driving with full tank for 80-90 miles with no problems, even got wet in summer shower few times. So it does not seem as a electrical problem.
Today i have driven back and forth for 20 miles up to speed of 80 mph. Had no feeling of power loss, or any problems with fuel / air ratio, or spark problems.

Any ideas what could it be? Because after last stall i drove less than half mile to my garage and it just kept working and idle'ing fine afres stopping at the gates. turned it off, and started it again for few times with no problem. So can't identify what is wrong.
The only way is to drive it till it stalls again at some moment, not knowing how far from garage.
I even got stupid idea, that it could be the gas shortage. Can it be, that to little gas in tank does not give enouth pressure to push the fuel that is left to the system? It seams on lower gear it gets enougth, but on 4th gear the stalling starts. After stopping the fuel slowly gets to system, and lets me drive again.
Just realised, that i i made around 100 miles, thats the limit for one tank. So it is possible, that i'm at the limit of my gas. But if that would be the problem, i would not be able to drive after first stall? I did not switch to reserve.

1987 Honda Rebel 450
Norbertas is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 08-09-2019, 04:19 PM
Moderator
 
Join Date: Aug 2008
Location: Monroe, Louisiana
Posts: 28,363
Chech the vacuum tube from the engine to the carb. Make sure it is firmly attaced on both ends and has no holes. You can check to see if the vacuum operated petcock is working by disconnecting the fuel line at the carb and sucking on the vacuum hose. Have a container in place to hold the gas that comes out, if any.

Have you tried loosening the gas cap while riding to see if there might be a vacuum lock? Have you installed an inline fuel filter? If there is enough fuel in the tank to reach the petcock, it will gravity flow to the carb, assuming the petcock is performing as it should. Doesn't the petcock have a reserve position? If yes, try turning it to reserve when it begins to stall.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
flitecontrol is offline  
post #3 of 7 Old 08-09-2019, 06:30 PM
 
Guba's Avatar
 
Join Date: Aug 2008
Location: Creston, Ohio
Posts: 5,932
Mine would lose power like it was going empty even with a full tank of gas, then I would switch to reserve and it rode just fine. In my case the petcock strainer was clogged.

MC.com ruined this forum

Silver '86 450
Black '00 250
Red '07 250
Guba is offline  
 
post #4 of 7 Old 08-09-2019, 07:39 PM
 
Join Date: Jul 2019
Location: Northern Virginia/Metro DC
Posts: 213
Quote:
Originally Posted by Guba View Post
Mine would lose power like it was going empty even with a full tank of gas, then I would switch to reserve and it rode just fine. In my case the petcock strainer was clogged.

That is very interesting.

When I read his initial description of the symptoms, they sounded very similar to what I recently experienced when I ran the tank low and had to switch over to reserve.

But then his additional discussion made it clear he was not low on fuel.

But your theory is definitely worth testing. And itís as easy to do as switching the petcock to reserve!
.

2016 Rebel 250 - - Black
VAReb is offline  
post #5 of 7 Old 08-10-2019, 08:18 PM
DNC
 
DNC's Avatar
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 1,065
Garage
You have a faulty stator. When it gets warm it stops working. Google it.

You can quickly determine by checking resistance with a multimeter at the contacts under seat. Plenty of decent videos on YouTube that can help.

I had the same problem, changed the stator and it went away. Used one is fine, but have seller verify before purchasing. They the flywheel should be changed too. I had a spare bike so did, but cannot verify if it is truly necessary that they stay together as a pair from the factory.

'86 CMX450 Gin-ba
'87 CMX450 Kuro
'86 CMX450 Tabo
'90 CB-1 Seishin
'86 CMX450 Uki
DNC is offline  
post #6 of 7 Old 08-11-2019, 12:48 AM
Moderator
 
Join Date: Aug 2008
Location: Monroe, Louisiana
Posts: 28,363
The VN750 is known for eating stators. Slapping a replacement into the existing flywheel isn't a problem on that bike. Don't know why it would be different for the Rebel, but have no experience with those stators/flywheels.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
flitecontrol is offline  
post #7 of 7 Old 08-13-2019, 08:46 PM
 
Join Date: Nov 2014
Location: NYC
Posts: 176
4 stops in 4 miles seems like your float bowl is filling up, after as you said, you wait 5 minutes.

1 mile per full float bowl plus some trickling fuel.

So I 2nd Flightcontrol's question, do you have an inline fuel filter?

Honda Rebel 2005; Yamaha TX500 (prior)
reb2005 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Rebel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome