Hard start when engine is hot


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nitefuzz
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Hard start when engine is hot

Post by nitefuzz »



I have been finding that my 98 SE is starting hard after it is completely warmed. It acts like it is flooding itself. I have noticed a strong gas smell after I get home and park it in the shop................... does anyone have some ideas for me............. maybe the petcock needs to be rebuilt????? Any ideas or thoughts would be appreciated.

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Re: Hard start when engine is hot

Post by WingAdmin »

nitefuzz wrote:I have been finding that my 98 SE is starting hard after it is completely warmed. It acts like it is flooding itself. I have noticed a strong gas smell after I get home and park it in the shop................... does anyone have some ideas for me............. maybe the petcock needs to be rebuilt????? Any ideas or thoughts would be appreciated.

Nitfuzz
Is it not cranking well? Or is it cranking normally, and just not starting?
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Re: Hard start when engine is hot

Post by nitefuzz »

it cranks normal but seems like it is starving for gas............. or like it is trying to flood its self. I have to give it some throttle and then its fires and runs fine. If it is completely warmed up from a long run, and I shut it off and then restart it within 10 to 15 minutes it starts fine, if it sits for 30 minutes then it starts hard?????? any suggestions or is it just the nature of the beast.

I purchased a new fuel filter and am going to change it out. (its not an Emgo, I purchased a filter from the local NAPA parts store and am going to try it, I seen where guys are using the NAPA filter 3011, after looking at the 3011 filter, it does not have the barbs on the connections for the clamps to lock on good, my NAPA guy showed me the one he recommended that has the barbs on it so I purchased that one)
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Re: Hard start when engine is hot

Post by curley »

how old is the battery?...how clean and tight are the connections at the battery?
1500s use a lot of juice to spin the starter...it takes more ( power)when the starter is hot...it "steals" the power from the coils and the plugs don't fire...the mixture goes "rich"....
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Re: Hard start when engine is hot

Post by ct1500 »

nitefuzz wrote:it cranks normal but seems like it is starving for gas............. or like it is trying to flood its self. I have to give it some throttle and then its fires and runs fine. If it is completely warmed up from a long run, and I shut it off and then restart it within 10 to 15 minutes it starts fine, if it sits for 30 minutes then it starts hard??????
nitefuzz wrote:I have noticed a strong gas smell after I get home
One or both float bowl gaskets might be leaking emptying/lowering them. Do a visual check of them and the spark plugs in addition to a charging system check and battery load test.
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Re: Hard start when engine is hot

Post by bjatwood »

My 98 has done this exact same thing since I bought it. I feel it has something to do with pressure it the tank. As it will not start hard if I stop and get gas then start it and take off. I usually give it a bit of throttle when hot starting it, that will help also.
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Re: Hard start when engine is hot

Post by nitefuzz »

curley wrote:how old is the battery?...how clean and tight are the connections at the battery?
1500s use a lot of juice to spin the starter...it takes more ( power)when the starter is hot...it "steals" the power from the coils and the plugs don't fire...the mixture goes "rich"....

Battery is new last summer................... any input on the fuel filter I am going to try, it is a NAPA 7-02323, it has both 1/4 inch and 5/16 inlet-outlet ports.

What size of outlet/inlet ports dose the Honda OEM filter have?

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Re: Hard start when engine is hot

Post by TAZZ »

I used fuel filter 3003 you guys used 3011 from NAPA what the diff if any
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Re: Hard start when engine is hot

Post by bjatwood »

Fuel filter won't make any difference.
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Re: Hard start when engine is hot

Post by nitefuzz »

TAZZ wrote:I used fuel filter 3003 you guys used 3011 from NAPA what the diff if any

after lookiong further into the NAPA filter it looks like I need to take this one back and get the filter with the part number of #3003, it has the larger 3/8' inlet and outlet ports.......... does anyone know exactly how big those ports are supose to be. I am thinking they are 3/8' but not sure until I get the filter off and look at it, I would like to have the correct one when I do this so I can get it back together right away.
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Re: Hard start when engine is hot

Post by curley »

they measure about 0.410" in dia....3/8" should work ...or in a metric world 10mm in dia.
filter is appox 4" long end to end...body is about 2 1/4" long, appox 1" in dia.

how does the bike run under hard acceleration?...does it miss or lack performance?..may need a new fuel pump or rebuild the "petcock"
hope this helps
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Re: Hard start when engine is hot

Post by MikeB »

The OEM filter has a 13/32" outside diameter port on each end. If you include the barb diameter in the measurement, it is 7/16" diameter. A filter with 3/8" ports will be a thirty-second of an inch smaller than OEM. If it has a barbed end, you might be okay using it.
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Re: Hard start when engine is hot

Post by Dieselman1994 »

Has anyone figured this issue out in having the same problem
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Re: Hard start when engine is hot

Post by Dieselman1994 »

Anyone figured this one out my 1992 does the same thing
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Re: Hard start when engine is hot

Post by khspe2 »

Is the rubber mat between the carbs and the intakes still on the bike and intact?
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Re: Hard start when engine is hot

Post by MikeB »

Dieselman1994 wrote: Fri Mar 29, 2024 11:00 am Anyone figured this one out my 1992 does the same thing
Maybe you are not aware of this, but the original post was ten years ago. Perhaps you need to message the original poster directly.
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Re: Hard start when engine is hot

Post by Snowmoer »

My 88 was doing the same thing as the original poster said. I found that the rubber cover over the engine was falling apart and the heat was vapor locking the carb. I replaced the cover and that helped big time. I was riding in 110 degree temps at the time. If it was 85 or below, I did not have any problems starting
with the old mat. Before I replaced the mat, I had to give it a little gas to get it to start. But not too much!
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Re: Hard start when engine is hot

Post by jbaviera »

Snowmoer wrote: Sat Mar 30, 2024 4:49 pm My 88 was doing the same thing as the original poster said. I found that the rubber cover over the engine was falling apart and the heat was vapor locking the carb. I replaced the cover and that helped big time. I was riding in 110 degree temps at the time. If it was 85 or below, I did not have any problems starting
with the old mat. Before I replaced the mat, I had to give it a little gas to get it to start. But not too much!
My question it, where did you find the mat/materal? My 95 has a strong gas smell after a day of riding.
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Re: Hard start when engine is hot

Post by Snowmoer »

jbaviera wrote: Mon Apr 01, 2024 7:02 am
Snowmoer wrote: Sat Mar 30, 2024 4:49 pm My 88 was doing the same thing as the original poster said. I found that the rubber cover over the engine was falling apart and the heat was vapor locking the carb. I replaced the cover and that helped big time. I was riding in 110 degree temps at the time. If it was 85 or below, I did not have any problems starting
with the old mat. Before I replaced the mat, I had to give it a little gas to get it to start. But not too much!
My question it, where did you find the mat/materal? My 95 has a strong gas smell after a day of riding.
I ordered an OEM one from Honda. Some have found a rubber sheet and laid the old pieces out and cut a new one. The OEM ones are a little on the expensive side for a piece of rubber!

The smell of gas is a fuel leak somewhere. When my bike was having the starting problems due to high heat, there was not a smell of fuel. I had already replaced all the fuel lines and rebuilt the carbs and fuel valve.
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Re: Hard start when engine is hot

Post by WingAdmin »

Just buy a sheet of high-temperature silicone, cut it out in the shape of the original, and you'll have an excellent replacement that will likely outlast you - and at a fraction of the price that Honda wants.
Find This Item on Amazon:
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Re: Hard start when engine is hot

Post by bellboy40 »

That sheet of stuff to cut out would definitely be the cheapest way to go. The part is still available from Honda but it is over $80 plus shipping. It is item #1 in this parts fiche.
https://www.hondapartshouse.com/oempart ... water-pipe
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Re: Hard start when engine is hot

Post by jbaviera »

bellboy40 wrote: Mon Apr 01, 2024 2:04 pm That sheet of stuff to cut out would definitely be the cheapest way to go. The part is still available from Honda but it is over $80 plus shipping. It is item #1 in this parts fiche.
https://www.hondapartshouse.com/oempart ... water-pipe
Thanks for the link. Wouldn't have thought about looking at the "water pipe" break down. That's expensive!
Last edited by jbaviera on Mon Apr 01, 2024 3:49 pm, edited 1 time in total.
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Re: Hard start when engine is hot

Post by jbaviera »

Snowmoer wrote: Mon Apr 01, 2024 11:12 am
jbaviera wrote: Mon Apr 01, 2024 7:02 am
Snowmoer wrote: Sat Mar 30, 2024 4:49 pm My 88 was doing the same thing as the original poster said. I found that the rubber cover over the engine was falling apart and the heat was vapor locking the carb. I replaced the cover and that helped big time. I was riding in 110 degree temps at the time. If it was 85 or below, I did not have any problems starting
with the old mat. Before I replaced the mat, I had to give it a little gas to get it to start. But not too much!
My question it, where did you find the mat/materal? My 95 has a strong gas smell after a day of riding.
I ordered an OEM one from Honda. Some have found a rubber sheet and laid the old pieces out and cut a new one. The OEM ones are a little on the expensive side for a piece of rubber!

The smell of gas is a fuel leak somewhere. When my bike was having the starting problems due to high heat, there was not a smell of fuel. I had already replaced all the fuel lines and rebuilt the carbs and fuel valve.
I figured I might have a slight fuel leak somewhere, though I only smell it when I pull into the garage after a day trip. I figure I may as well replace that while I'm in there!
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Re: Hard start when engine is hot

Post by jbaviera »

WingAdmin wrote: Mon Apr 01, 2024 12:10 pm Just buy a sheet of high-temperature silicone, cut it out in the shape of the original, and you'll have an excellent replacement that will likely outlast you - and at a fraction of the price that Honda wants.
Thanks for the link! Is that sheet big enough at 9"x12"?
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Re: Hard start when engine is hot

Post by Dfed5773 »

So did the heat mat solve the problem? My 99 gl1500 has the same hard start when hot, acting flooded when hot, and a couple drops of gas overflow only when hot. I’ve done the sea foam soak on the gas cap, also soaked and tried another cap from a parts bike, but still have the issue. I put a clear tube on the gas cap and could see it bubbling out, so it is venting. Curious if you fixed yours.


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