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Apr 25, 2021 15:59:31 GMT
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Hey guys just wondering if anyone can help? When I rev my escort then let off the throttle the car continues to rev. It is running an 1800 zetec on bike carbs. We have disconnected the throttle cable so I have ruled this out, the only way to rev it up then return it to idle is if you turn the linkage by hand on the carbs. If anyone has any ideas on how to rectify this I would be very grateful! Thanks Rob.
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ChrisT
Club Retro Rides Member
Posts: 1,635
Club RR Member Number: 225
Member is Online
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Bike carbs keep revvingChrisT
@christ
Club Retro Rides Member 225
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Apr 25, 2021 16:12:40 GMT
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Assume all the carbs are balanced and the throttle flaps in sync with each other, it could be as simple as a return spring not working.
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Apr 25, 2021 17:04:04 GMT
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Assume all the carbs are balanced and the throttle flaps in sync with each other, it could be as simple as a return spring not working. Thanks for your reply, They seem to be in sync with each other and I can only assume there balanced. I will contacting the company I bought the kit from tomorrow to see what they have to say. I have checked the external springs which all seem to be ok is there internal ones? |
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Apr 25, 2021 19:45:43 GMT
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I expect that the carb spindles are not quite in line with each other, so are fighting each other and binding up.
Assuming they are the usual silicone hose links to manifold stubs I’d think you’ll just need to slacken the clips a bit and wriggle the carbs about a bit until the throttles move freely and snap back to idle properly before nipping the clips up again.
Suspect they’ll likely want a final balance too.
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Apr 25, 2021 19:53:53 GMT
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Sounds like something on the linkage is bent or overtightened.
Do you know what the carbs are off originally as there are a few different types of action.
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Needs a bigger hammer mate.......
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I expect that the carb spindles are not quite in line with each other, so are fighting each other and binding up. Assuming they are the usual silicone hose links to manifold stubs I’d think you’ll just need to slacken the clips a bit and wriggle the carbs about a bit until the throttles move freely and snap back to idle properly before nipping the clips up again. Suspect they’ll likely want a final balance too. Nick Thanks Nick, yes they are just the usual silicone hoses linking the two together. I will try wriggling the carbs and see if that helps. Thanks |
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Sounds like something on the linkage is bent or overtightened. Do you know what the carbs are off originally as there are a few different types of action. Unfortunately I don’t know what they are off I bought them as part of a kit from danST engineering. I have emailed them and have got a response saying that either something is touching the linkage ie the hoses or clamps or there is a problem with the throttle cable although as I stated above I have disconnected the cable and it still does it and the hoses and clamps are not touching the linkage. They said I may have to add another spring on the quadrant to help it return to idle faster? Thanks Rob. |
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shin2chin
Part of things
Making curse word cars slightly better
Posts: 820 
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Do you have a return spring fitted?
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1977 PORSCHE 2.0na 924
1974 VW Beetle 1600
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The throttle linkage should be working against a light return spring. When opened and released it should just spring back to idle position.
Assuming the car starts, idles and revs but the slides are not returning to idle position.
This indicates:
A mechanical issue in the linkages and or cable
A sticking slide or improperly seated slide
If you can remove any filter(s) so you can see into the carbs then rotate the quadrant to ensure all slides rise at the same time.
Then one by one see if you can lift the slide in each carb using a finger or non damaging (plastic) implement and they should when released drop back into position.
This is a link to bike CV carbs in which he covers some relevant info.
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Needs a bigger hammer mate.......
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1961 FORD POPULAR 100e
2.0 dohc
Mk1 2dr Ford cortina
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The throttle linkage should be working against a light return spring. When opened and released it should just spring back to idle position. Assuming the car starts, idles and revs but the slides are not returning to idle position. This indicates: A mechanical issue in the linkages and or cable A sticking slide or improperly seated slide If you can remove any filter(s) so you can see into the carbs then rotate the quadrant to ensure all slides rise at the same time. Then one by one see if you can lift the slide in each carb using a finger or non damaging (plastic) implement and they should when released drop back into position. This is a link to bike CV carbs in which he covers some relevant info. Thanks that’s really helpful I will have a look to see what is going on inside. Rob |
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I haven’t added anything extra to the carbs as in a return spring didn’t realise I had to! Thanks for your reply and the link. Rob. |
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Do you have a return spring fitted? I haven’t added one mate but I will look into it. Rob. |
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May 10, 2021 11:16:19 GMT
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1961 FORD POPULAR 100e
2.0 dohc
Mk1 2dr Ford cortina
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May 12, 2021 11:37:26 GMT
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Thanks for your help I’ve added a return spring and it seems to have done the trick! Thanks to all that replied, Rob. |
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