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Hard to cold start
Posted: Thu Jun 08, 2023 11:56 pm
by Sb_750
Hello I have a bmw r75
I have velocity stacks and a mesh filter and the bike runs perfectly but there is a small issue where it does not start without starter fluid when cold. Once started though it runs perfectly. Hot starts also are easy. Please help thanks
Re: Hard to cold start
Posted: Fri Jun 09, 2023 7:44 am
by barryh
Are the enrichers working ? One possible problem is a blocked jet in the float bowl. Remove the float bowls and you will see the enricher wells into which a long brass tube inserts from the main carb body. At the bottom of the well is a small hole or jet that allows the well to be filled from the float bowl. Make sure that hole is clear which should enable the enrichers to function.
Re: Hard to cold start
Posted: Fri Jun 09, 2023 10:10 am
by Kurt in S.A.
How did it run before the velocity stacks?
Kurt
Re: Hard to cold start
Posted: Fri Jun 09, 2023 4:37 pm
by Sb_750
barryh wrote: ↑Fri Jun 09, 2023 7:44 am
Are the enrichers working ? One possible problem is a blocked jet in the float bowl. Remove the float bowls and you will see the enricher wells into which a long brass tube inserts from the main carb body. At the bottom of the well is a small hole or jet that allows the well to be filled from the float bowl. Make sure that hole is clear which should enable the enrichers to function.
I will check that now
Re: Hard to cold start
Posted: Fri Jun 09, 2023 4:38 pm
by Sb_750
Kurt in S.A. wrote: ↑Fri Jun 09, 2023 10:10 am
How did it run before the velocity stacks?
I think it was working fine but it was sitting about a year in between with carbs off
Kurt
Re: Hard to cold start
Posted: Fri Jun 09, 2023 4:59 pm
by Sb_750
I fixed it I just blew some air in the thin tube that Leads to the choke still take a couple try’s but it starts now
thanks
Re: Hard to cold start
Posted: Fri Jun 09, 2023 10:39 pm
by SteveD
Re: Hard to cold start
Posted: Sun Jun 11, 2023 1:00 pm
by Tasha 2020
Another common problem is that the enricher gaskets deteriorate which makes them suck air and not fuel
Re: Hard to cold start
Posted: Sun Jun 18, 2023 5:39 am
by barryh
Tasha 2020 wrote: ↑Sun Jun 11, 2023 1:00 pm
Another common problem is that the enricher gaskets deteriorate which makes them suck air and not fuel
Enricher gasket have a bit of a reputation for being pulled in. When I hade my carbs in bits and examined the enricher covers I observed that they were not as flat as they might be. The covers look to be die cast and had not had a machined finish. I wonder if that is why they have gained this reputation. I think it's a worthwhile job to re-surface them using wet and dry on some plate glass. That exercise confirmed that mine were indeed not truly flat.
thanks